Acuity Brands (AYI) 10-K 26 Oct 17 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Aug. 31, 2017	Oct. 24, 2017	Feb. 28, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	ACUITY BRANDS INC
Entity Central Index Key	1,144,215
Document Type	10-K
Document Period End Date	Aug. 31, 2017
Amendment Flag	false
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--08-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		42,080,827
Entity Public Float			$ 9,261,770,061

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Aug. 31, 2017	Aug. 31, 2016
Current assets:
Cash and cash equivalents	$ 311.1	$ 413.2
Accounts receivable, less reserve for doubtful accounts of $1.9 and $1.7, respectively	573.3	572.8
Inventories	328.6	295.2
Prepayments and other current assets	32.6	41.7
Total current assets	1,245.6	1,322.9
Property, plant, and equipment, at cost:
Land	22.5	23.1
Buildings and leasehold improvements	180.7	174.4
Machinery and equipment	484.6	448.2
Total property, plant, and equipment	687.8	645.7
Less — Accumulated depreciation and amortization	(400.1)	(377.9)
Property, plant, and equipment, net	287.7	267.8
Goodwill	900.9	947.8
Intangible assets	448.8	381.4
Deferred income taxes	3.4	5.1
Other long-term assets	13.2	23
Total assets	2,899.6	2,948
Current liabilities:
Accounts payable	395.1	401
Current maturities of long-term debt	0.4	0.2
Accrued compensation	41.8	95.2
Other accrued liabilities	163.6	176.1
Total current liabilities	600.9	672.5
Long-term debt	356.5	355
Accrued pension liabilities	96.9	119.9
Deferred income taxes	108.2	74.6
Self-insurance reserves	7.9	7.2
Other long-term liabilities	63.6	59
Total liabilities	1,234	1,288.2
Commitments and Contingencies
Stockholders’ equity:
Preferred stock, $0.01 par value; 50,000,000 shares authorized; none issued	0	0
Common stock, $0.01 par value; 500,000,000 shares authorized; 53,549,840 and 53,415,687 issued, respectively	0.5	0.5
Paid-in capital	881	856.4
Retained earnings	1,659.9	1,360.9
Accumulated other comprehensive loss	(99.7)	(139.4)
Treasury stock, at cost — 11,678,002 and 9,679,457 shares, respectively	(776.1)	(418.6)
Total stockholders’ equity	1,665.6	1,659.8
Total liabilities and stockholders’ equity	$ 2,899.6	$ 2,948

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Aug. 31, 2017	Aug. 31, 2016
Current assets:
Allowance for doubtful accounts	$ 1.9	$ 1.7
Stockholders’ equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, issued (in shares)	53,549,840	53,415,687
Treasury stock (in shares)	11,678,002	9,679,457

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Income Statement [Abstract]
Net sales	$ 3,505.1	$ 3,291.3	$ 2,706.7
Cost of products sold	2,023.9	1,855.1	1,561.1
Gross profit	1,481.2	1,436.2	1,145.6
Selling, distribution, and administrative expenses	951.1	946	756.9
Special charge	11.3	15	12.4
Operating profit	518.8	475.2	376.3
Other expense (income):
Interest expense, net	32.5	32.2	31.5
Miscellaneous (income) expense, net	(6.3)	(1.6)	1.2
Total other expense	26.2	30.6	32.7
Income before provision for income taxes	492.6	444.6	343.6
Provision for income taxes	170.9	153.8	121.5
Net income	$ 321.7	$ 290.8	$ 222.1
Earnings per share:
Basic earnings per share (in dollars per share)	$ 7.46	$ 6.67	$ 5.13
Basic weighted average number of shares outstanding (in shares)	43.1	43.5	43.1
Diluted earnings per share (in dollars per share)	$ 7.43	$ 6.63	$ 5.09
Diluted weighted average number of shares outstanding (in shares)	43.3	43.8	43.4
Dividends declared per share (in dollars per share)	$ 0.52	$ 0.52	$ 0.52
Other comprehensive income (loss) items:
Foreign currency translation adjustments	$ 19	$ (5.6)	$ (24)
Defined benefit plans, net	20.7	(23.4)	(14.5)
Other comprehensive income (loss) items, net of tax	39.7	(29)	(38.5)
Comprehensive income	$ 361.4	$ 261.8	$ 183.6

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Cash flows from operating activities:
Net income	$ 321.7	$ 290.8	$ 222.1
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	74.6	62.6	45.8
Share-based payment expense	32	27.7	18.2
Excess tax benefits from share-based payments	(5.2)	(25.6)	(17.6)
Loss (gain) on the sale or disposal of property, plant, and equipment	0.3	(0.9)	0.7
Asset impairments	0	5.1	0
Deferred income taxes	(7.7)	(8.2)	2.8
Gain on sale of investment in unconsolidated affiliate	(7.2)	0	0
Loss on financial instruments, net	0	0	2.6
Change in assets and liabilities, net of effect of acquisitions, divestitures, and exchange rate changes:
Accounts receivable	2.7	(94.6)	(46.1)
Inventories	(32.4)	(24)	(15.1)
Prepayments and other current assets	6	(10.5)	0.7
Accounts payable	(4.6)	65.3	23.1
Other current liabilities	(63.5)	60.6	59.3
Other	(0.5)	(2.6)	(7.6)
Net cash provided by operating activities	316.2	345.7	288.9
Cash flows from investing activities:
Purchases of property, plant, and equipment	(67.3)	(83.7)	(56.5)
Proceeds from sale of property, plant, and equipment	5.5	2.2	1.3
Acquisitions of businesses and intangible assets, net of cash acquired	0	(623.2)	(14.6)
Proceeds from sale of investment in unconsolidated affiliate	13.2	0	0
Other investing activities	(0.2)	0	(2.6)
Net cash used for investing activities	(48.8)	(704.7)	(72.4)
Cash flows from financing activities:
Issuance of long-term debt	1	2.5	0
Repurchases of common stock	(357.9)	0	0
Proceeds from stock option exercises and other	3	14.2	11.6
Excess tax benefits from share-based payments	5.2	25.6	17.6
Dividends paid	(22.7)	(22.9)	(22.7)
Other financing activities	0	0	(10.4)
Net cash (used for) provided by financing activities	(371.4)	19.4	(3.9)
Effect of exchange rate changes on cash and cash equivalents	1.9	(4)	(8.3)
Net change in cash and cash equivalents	(102.1)	(343.6)	204.3
Cash and cash equivalents at beginning of year	413.2	756.8	552.5
Cash and cash equivalents at end of year	311.1	413.2	756.8
Supplemental cash flow information:
Income taxes paid during the period	173.6	120.7	106.3
Interest paid during the period	$ 33.6	$ 32.8	$ 32.2

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss Items	Treasury Stock, at cost
Balance at August 31, 2016 at Aug. 31, 2014	$ 1,163.5	$ 0.5	$ 761.5	$ 893.6	$ (71.9)	$ (420.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	222.1			222.1
Other comprehensive loss	(38.5)				(38.5)
Amortization, issuance, and cancellations of restricted stock grants	6.4		6.4
Employee stock purchase plan issuances	0.5		0.5
Cash dividends of $0.52 per share paid on common stock	(22.7)			(22.7)
Stock options exercised	11.1		11.1
Excess tax benefits from share-based payments	17.6		17.6
Balance at August 31, 2017 at Aug. 31, 2015	1,360	0.5	797.1	1,093	(110.4)	(420.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	290.8			290.8
Other comprehensive loss	(29)				(29)
Common stock issued from treasury stock for acquisition of business	10		8.4			1.6
Amortization, issuance, and cancellations of restricted stock grants	11.1		11.1
Employee stock purchase plan issuances	0.7		0.7
Cash dividends of $0.52 per share paid on common stock	(22.9)			(22.9)
Stock options exercised	13.5		13.5
Excess tax benefits from share-based payments	25.6		25.6
Balance at August 31, 2017 at Aug. 31, 2016	1,659.8	0.5	856.4	1,360.9	(139.4)	(418.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	321.7			321.7
Other comprehensive loss	39.7				39.7
Amortization, issuance, and cancellations of restricted stock grants	16.8		16.4			0.4
Employee stock purchase plan issuances	0.9		0.9
Cash dividends of $0.52 per share paid on common stock	(22.7)			(22.7)
Stock options exercised	2.1		2.1
Repurchases of common stock	(357.9)					(357.9)
Excess tax benefits from share-based payments	5.2		5.2
Balance at August 31, 2017 at Aug. 31, 2017	$ 1,665.6	$ 0.5	$ 881	$ 1,659.9	$ (99.7)	$ (776.1)

Consolidated Statements of Sto7

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Statement of Stockholders' Equity [Abstract]
Cash dividends per share paid (in dollars per share)	$ 0.52	$ 0.52	$ 0.52

Description of Business and Bas

Description of Business and Basis of Presentation	12 Months Ended
	Aug. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Basis of Presentation	Description of Business and Basis of Presentation Acuity Brands, Inc. (“Acuity Brands”) is the parent company of Acuity Brands Lighting, Inc. (“ABL”) and other subsidiaries (Acuity Brands, ABL, and such other subsidiaries are collectively referred to herein as the “Company”) and was incorporated in 2001 under the laws of the State of Delaware. The Company is one of the world’s leading providers of lighting and building management solutions and services for commercial, institutional, industrial, infrastructure, and residential applications throughout North America and select international markets. The Company’s lighting and building management solutions include devices such as luminaires, lighting controls, controllers for various building systems, power supplies, prismatic skylights, and drivers, as well as integrated systems designed to optimize energy efficiency and comfort for various indoor and outdoor applications. Additionally, the Company continues to expand its solutions portfolio, including software and services, to provide a host of other economic benefits resulting from data analytics that enables the Internet of Things (“IoT”), supports the advancement of smart buildings, smart cities, and the smart grid, and allows businesses to develop custom applications to scale their operations. The Company has one reportable segment serving the North American lighting market and select international markets. The Consolidated Financial Statements have been prepared by the Company in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) and present the financial position, results of operations, and cash flows of Acuity Brands and its wholly-owned subsidiaries.

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Aug. 31, 2017
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies Principles of Consolidation The Consolidated Financial Statements include the accounts of Acuity Brands and its wholly-owned subsidiaries after elimination of intercompany transactions and accounts. Revenue Recognition The Company records revenue when the following criteria are met: persuasive evidence of an arrangement exists, delivery has occurred, the Company’s price to the customer is fixed and determinable, and collectability is reasonably assured. Delivery is not considered to have occurred until the customer assumes the risks and rewards of ownership. Customers take delivery at the time of shipment for terms designated free on board shipping point. For sales designated free on board destination, customers take delivery when the product is received at the customer’s designated site. Provisions for certain rebates, sales incentives, product returns, and discounts to customers are recorded in the same period the related revenue is recorded. The Company also maintains one-time or ongoing marketing and trade-promotion programs with certain customers that require the Company to estimate and accrue the expected costs of such programs. These arrangements include cooperative marketing programs, merchandising of the Company’s products, introductory marketing funds for new products, and other trade-promotion activities conducted by the customer. Costs associated with these programs are reflected within the Company’s Consolidated Statements of Comprehensive Income in accordance with Accounting Standards Codification (“ASC”) Topic 605, Revenue Recognition (“ASC 605”), which in most instances requires such costs be recorded as a reduction of revenue. The liabilities associated with the programs totaled $38.1 million and $41.0 million as of August 31, 2017 and 2016 , respectively, and are reflected within Other accrued liabilities on the Consolidated Balance Sheets . The Company's standard terms and conditions of sale allow returns of certain products within four months of the date of shipment. The Company also provides for limited product return rights to certain distributors and other customers, primarily for slow moving or damaged items subject to certain defined criteria. The limited product return rights generally allow customers to return resalable products purchased within a specified time period and subject to certain limitations, including, at times, when accompanied by a replacement order of equal or greater value. At the time revenue is recognized, the Company records a provision for the estimated amount of future returns primarily based on historical experience, specific notification of pending returns, or contractual terms with the respective customers. Although historical product returns generally have been within expectations, there can be no assurance that future product returns will not exceed historical amounts. A significant increase in product returns could have a material adverse impact on the Company's operating results in future periods. Revenue is earned on services and the sale of products. Revenue is recognized for the sale of products when the above criteria are met and for services rendered in the period of performance. Revenue Recognition for Arrangements with Multiple Deliverables A small portion ( less than 4% ) of the Company's revenues are derived from the combination of any or all of: (i) the sale and license of its products, (ii) fees associated with training, installation, and technical support services, (iii) monitoring and lighting control services, and (iv) providing services related to data analytics. Certain agreements for integrated lighting solutions represent multiple-element arrangements that include tangible products as well as services that are essential to the functionality of the solution. These services primarily relate to installation, monitoring, and lighting controls services. All of these elements are reviewed and analyzed to determine separability in relation to the delivered elements and appropriate pricing treatment based on (a) vendor-specific objective evidence, (b) third-party evidence, or (c) management estimates. If deemed separate units of accounting, the revenue and associated cost of sales related to the delivered elements are recognized at the time of delivery, while those related to the undelivered elements are recognized appropriately based on the period of performance. If the separation criterion for the undelivered elements is not met because the undelivered elements are essential to the functionality of the lighting controls systems, all revenue and cost of sales attributable to the contract are deferred at the time of sale and are both generally recognized on a straight-line basis over the respective contract periods. Use of Estimates The preparation of financial statements and related disclosures in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expense during the reporting period. Actual results could differ from those estimates. Cash and Cash Equivalents Cash in excess of daily requirements is invested in time deposits and marketable securities and is included in the accompanying balance sheets at fair value. The Company considers time deposits and marketable securities with an original maturity of three months or less when purchased to be cash equivalents. Accounts Receivable The Company records accounts receivable at net realizable value. This value includes a reserve for doubtful accounts to reflect losses anticipated on accounts receivable balances. The allowance is based on historical write-offs, an analysis of past due accounts based on the contractual terms of the receivables, and the economic status of customers, if known. Management believes that the allowance is sufficient to cover uncollectible amounts; however, there can be no assurance that unanticipated future business conditions of customers will not have a negative impact on the Company’s results of operations. Concentrations of Credit Risk Concentrations of credit risk with respect to receivables, which are typically unsecured, are generally limited due to the wide variety of customers and markets using the Company’s lighting and building management solutions as well as their dispersion across many different geographic areas. Two customers each accounted for approximately 10% of receivables at August 31, 2017 , and no single customer accounted for more than 10% of net sales in fiscal 2017 . One customer accounted for approximately 10% of receivables at August 31, 2016 , and no single customer accounted for more than 10% of net sales in fiscal 2016 . A single customer accounted for approximately 11% of net sales in fiscal 2015. Reclassifications Certain prior-period amounts have been reclassified to conform to the current year presentation. No material reclassifications occurred during the current period. Subsequent Events The Company has evaluated subsequent events for recognition and disclosure for occurrences and transactions after the date of the consolidated financial statements as of August 31, 2017 . Inventories Inventories include materials, direct labor, in-bound freight, and related manufacturing overhead, are stated at the lower of cost (on a first-in, first-out or average cost basis) or market, and consist of the following (in millions): August 31, 2017 2016 Raw materials, supplies, and work in process (1) $ 176.5 $ 170.3 Finished goods 180.8 145.3 Inventories excluding reserves 357.3 315.6 Less: Reserves (28.7 ) (20.4 ) Total inventories $ 328.6 $ 295.2 _______________________________________ (1) Due to the immaterial amount of estimated work in process and the short lead times for the conversion of raw materials to finished goods, the Company does not believe the segregation of raw materials and work in process is meaningful information. Management reviews inventory quantities on hand and records a provision for excess or obsolete inventory primarily based on estimated future demand and current market conditions. A significant change in customer demand or market conditions could render certain inventory obsolete and could have a material adverse impact on the Company’s operating results in the period the change occurs. Assets Held for Sale In accordance with applicable U.S. GAAP, the Company classifies assets as held for sale upon the development of a plan for disposal and ceases the depreciation and amortization of the assets at that date. The Company did not classify any assets as held for sale as of August 31, 2017 . As of August 31, 2016 , certain property with a carrying value of $5.4 million was classified as held for sale and included within Prepayments and other current assets on the Consolidated Balance Sheets . This property was subsequently sold during the year ended August 31, 2017 . Goodwill and Other Intangibles Goodwill amounted to $900.9 million and $947.8 million as of August 31, 2017 and 2016 , respectively. The change in the carrying amount of goodwill during fiscal 2017 is summarized as follows (in millions): Balance as of August 31, 2016 $ 947.8 Adjustments to provisional amounts (56.5 ) Foreign currency translation adjustments 9.6 Balance as of August 31, 2017 $ 900.9 Summarized information for the Company’s acquired intangible assets is as follows (in millions): August 31, 2017 2016 Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Definite-lived intangible assets: Patents and patented technology $ 124.1 $ (51.5 ) $ 112.3 $ (39.9 ) Trademarks and trade names 27.2 (12.0 ) 27.2 (10.7 ) Distribution network 61.8 (35.2 ) 61.8 (33.0 ) Customer relationships 240.8 (43.1 ) 157.9 (29.3 ) Other 4.6 (4.6 ) 4.9 (4.8 ) Total definite-lived intangible assets $ 458.5 $ (146.4 ) $ 364.1 $ (117.7 ) Indefinite-lived trade names $ 136.7 $ 135.0 Through multiple acquisitions, the Company acquired intangible assets consisting primarily of trademarks and trade names associated with specific products with finite lives, definite-lived distribution networks, patented technology, non-compete agreements, and customer relationships, which are amortized over their estimated useful lives. Indefinite-lived intangible assets consist of trade names that are expected to generate cash flows indefinitely. Significant estimates and assumptions were used to determine the initial fair value of these acquired intangible assets, including estimated future net sales, customer attrition rates, royalty rates, and discount rates. The current year increase in the gross carrying amounts for the acquired intangible assets and the decrease in goodwill were due primarily to the finalization of the purchase accounting allocation during the current fiscal year for Juno Lighting LLC (“Juno Lighting”) and DGLogik, Inc. (“DGLogik”) as well as foreign currency translation adjustments. Refer to the Acquisitions and Investments footnote for additional information regarding the purchase price allocations for these acquisitions. The Company recorded amortization expense of $28.0 million , $21.4 million , and $11.0 million related to intangible assets with finite lives during fiscal 2017 , 2016 , and 2015 , respectively. Amortization expense is generally recorded on a straight-line basis and is expected to be approximately $26.4 million in fiscal 2018 , $26.4 million in fiscal 2019 , $26.0 million in fiscal 2020 , $25.7 million in fiscal 2021 , and $22.3 million in fiscal 2022 . The Company tests goodwill and indefinite-lived intangible assets for impairment on an annual basis or more frequently as facts and circumstances change, as required by ASC Topic 350, Intangibles — Goodwill and Other (“ASC 350”). Additionally, the Company early adopted Accounting Standards Update (“ASU”), Simplifying the Test for Goodwill Impairment (“ASU 2017-04,”). Refer to the New Accounting Pronouncements footnote for more information regarding the adoption of this standard. The preliminary goodwill impairment step allows for an optional qualitative analysis to determine the likelihood of impairment. If the qualitative review results in a more likely than not probability of impairment, a quantitative analysis is required. The qualitative step may be bypassed entirely in favor of a quantitative test. The quantitative analysis identifies impairments by comparing the fair value of a reporting unit with its carrying value, including goodwill. The fair values can be determined based on a combination of valuation techniques including the expected present value of future cash flows, a market multiple approach, and a comparable transaction approach. If the fair value of a reporting unit exceeds its carrying value, goodwill is not considered impaired. Conversely, if the carrying value of a reporting unit exceeds its fair value, an impairment charge for the difference is recorded. In fiscal 2017 , a quantitative fair value analysis, based on discounted future cash flows, was used to determine the likelihood of goodwill impairment for the Company’s one reporting unit. During fiscal 2016 and 2015, a qualitative analysis was used to determine the likelihood of impairment. The analysis for goodwill did not result in an impairment charge during fiscal 2017 , 2016 , or 2015 . The impairment test for indefinite-lived trade names consists of comparing the fair value of an asset with its carrying value. If the carrying amount exceeds the estimated fair value, an impairment loss would be recorded in the amount of the excess. The Company estimates the fair value of indefinite-lived trade names using a fair value model based on discounted future cash flows. Significant assumptions, including estimated future net sales, royalty rates, and discount rates, are used in the determination of estimated fair value for indefinite-lived trade names. The indefinite-lived trade name analysis did not result in an impairment charge for fiscal 2017 or 2015. However, during fiscal 2016, management began to rationalize the Company's portfolio of brands, resulting in the initiation of the phase out of one of the trade names. As a result, during fiscal 2016 , the Company recognized an impairment charge of $5.1 million related to this trade name and concluded the trade name is definite-lived. The impairment charge is included in Selling, distribution, and administrative expenses in the Consolidated Statements of Comprehensive Income for the year ended August 31, 2016 . The indefinite-lived intangible asset analysis for fiscal 2016 did not result in any other impairment charges, as the fair values exceeded the carrying values for each of the other trade names. Other Long-Term Assets Other long-term assets consist of the following (in millions): August 31, 2017 2016 Deferred contract costs $ 6.7 $ 8.3 Investment in noncontrolling affiliate (1) — 8.0 Other (2) 6.5 6.7 Total other long-term assets $ 13.2 $ 23.0 _______________________________________ (1) The Company previously held an equity investment in an unconsolidated affiliate. This strategic investment was less than a 20% ownership interest in the privately-held affiliate, and the Company did not maintain power over or control of the entity. The Company accounted for this investment using the cost method. During fiscal 2017, this investment was sold, resulting in the recognition of a gain of $7.2 million . (2) Amounts primarily include deferred debt issuance costs related to the Company's revolving credit facility and company-owned life insurance investments. The Company maintains life insurance policies on 73 former employees primarily to satisfy obligations under certain deferred compensation plans. These company-owned life insurance policies are presented net of loans that are secured by these policies. This program is frozen, and no new policies were issued in the three-year period ended August 31, 2017 . Other Long-Term Liabilities Other long-term liabilities consist of the following (in millions): August 31, 2017 2016 Deferred compensation and postretirement benefits other than pensions (1) $ 39.7 $ 37.3 Long-term warranty obligations 10.7 4.9 Unrecognized tax position liabilities, including interest (2) 7.0 6.1 Other (3) 6.2 10.7 Total other long-term liabilities $ 63.6 $ 59.0 _______________________________________ (1) The Company maintains several non-qualified retirement plans for the benefit of eligible employees, primarily deferred compensation plans. The deferred compensation plans provide for elective deferrals of an eligible employee’s compensation and, in some cases, matching contributions by the Company. In addition, one plan provides for an automatic contribution by the Company of 3% of an eligible employee’s compensation. The Company maintains life insurance policies on certain current and former officers and other key employees as a means of satisfying a portion of these obligations. (2) See the Income Taxes footnote for more information. (3) Amount primarily includes deferred revenue and deferred rent. The balance at August 31, 2016 includes a multi-employer pension plan withdrawal liability of $3.9 million , which was subsequently settled in full during fiscal 2017 Shipping and Handling Fees and Costs The Company includes shipping and handling fees billed to customers in Net sales in the Consolidated Statements of Comprehensive Income . Shipping and handling costs associated with inbound freight and freight between manufacturing facilities and distribution centers are generally recorded in Cost of products sold in the Consolidated Statements of Comprehensive Income . Other shipping and handling costs are included in Selling, distribution, and administrative expenses in the Consolidated Statements of Comprehensive Income and totaled $138.3 million , $124.0 million , and $105.6 million in fiscal 2017 , 2016 , and 2015 , respectively. Share-based Payments The Company recognizes compensation cost relating to share-based payment transactions in the financial statements based on the estimated fair value of the equity or liability instrument issued. The Company accounts for stock options, restricted shares, and share units representing certain deferrals into the Director Deferred Compensation Plan or the Supplemental Deferred Savings Plan (“SDSP”) (both of which are discussed further in the Share-based Payments footnote) based on the grant-date fair value estimated under the current provisions of ASC Topic 718, Compensation — Stock Compensation (“ASC 718”). Share-based payment expense includes expense related to restricted stock and options issued, as well as share units deferred into the Director Deferred Compensation Plan. The Company recorded $32.0 million , $27.7 million , and $18.2 million of share-based payment expense for the years ended August 31, 2017 , 2016 , and 2015 , respectively. The total income tax benefit recognized for share-based payment arrangements was $11.1 million , $9.6 million , and $6.4 million for the years ended August 31, 2017 , 2016 , and 2015 , respectively. The Company accounts for any awards with graded vesting on a straight-line basis. Additionally, forfeitures of share-based awards are estimated based on historical experience at the time of grant and are revised in subsequent periods if actual forfeitures differ from initial estimates. The Company did not capitalize any expense related to share-based payments and has recorded share-based payment expense, net of estimated forfeitures, in Selling, distribution, and administrative expenses in the Consolidated Statements of Comprehensive Income . Benefits of tax deductions in excess of recognized share-based payment cost are reported as a financing cash flow, rather than as an operating cash flow, in the Consolidated Statements of Cash Flows and amounted to $5.2 million , $25.6 million , and $17.6 million for fiscal 2017 , 2016 , and 2015 , respectively. See the Share-based Payments footnote for more information. Depreciation For financial reporting purposes, depreciation is determined principally on a straight-line basis using estimated useful lives of plant and equipment ( 10 to 40 years for buildings and related improvements and 3 to 15 years for machinery and equipment), while accelerated depreciation methods are used for income tax purposes. Leasehold improvements are amortized over the shorter of the life of the lease or the estimated useful life of the improvement. Depreciation expense amounted to $46.6 million , $41.2 million , and $34.8 million during fiscal 2017 , 2016 , and 2015 , respectively. Research and Development Research and development (“R&D”) expense, which is expensed as incurred, consists of compensation, payroll taxes, employee benefits, materials, supplies, and other administrative costs. R&D does not include all new product development costs and is included in Selling, distribution, and administrative expenses in the Company’s Consolidated Statements of Comprehensive Income . R&D expense amounted to $52.0 million , $47.1 million , and $41.1 million during fiscal 2017 , 2016 , and 2015 , respectively. Advertising Advertising costs are expensed as incurred and are included within Selling, distribution, and administrative expenses in the Company’s Consolidated Statements of Comprehensive Income . These costs totaled $18.6 million , $18.4 million , and $12.0 million during fiscal 2017 , 2016 , and 2015 , respectively. Interest Expense, Net Interest expense, net , is comprised primarily of interest expense on long-term debt, revolving credit facility borrowings, and loans collateralized by assets related to a company-owned life insurance program, partially offset by interest income on cash and cash equivalents. The following table summarizes the components of interest expense, net (in millions): Year Ended August 31, 2017 2016 2015 Interest expense $ 34.1 $ 33.3 $ 32.6 Interest income (1.6 ) (1.1 ) (1.1 ) Interest expense, net $ 32.5 $ 32.2 $ 31.5 Miscellaneous Expense (Income), Net Miscellaneous expense (income), net , is composed primarily of gains or losses on foreign currency items and other non-operating items. Gains or losses relating to foreign currency items consisted of income of $0.5 million in fiscal 2017 , expense of $0.8 million in fiscal 2016 , and expense of $0.7 million in fiscal 2015 . During fiscal 2017 , the Company recognized a $7.2 million gain associated with the sale of an investment in an unconsolidated affiliate, which is reflected within Miscellaneous expense (income), net . Income Taxes The Company is taxed at statutory corporate rates after adjusting income reported for financial statement purposes for certain items that are treated differently for income tax purposes. Deferred income tax expenses or benefits result from changes during the year in cumulative temporary differences between the tax basis and book basis of assets and liabilities. Foreign Currency Translation The functional currency for the foreign operations of the Company is the local currency where the foreign operations are domiciled. The translation of foreign currencies into U.S. dollars is performed for balance sheet accounts using exchange rates in effect at the balance sheet dates and for revenue and expense accounts using a weighted average exchange rate each month during the year. The gains or losses resulting from the balance sheet translation are included in Foreign currency translation adjustments in the Consolidated Statements of Comprehensive Income and are excluded from net income. Comprehensive Income Comprehensive income represents a measure of all changes in equity that result from recognized transactions and other economic events other than transactions with owners in their capacity as owners. Other comprehensive income for the Company includes foreign currency translation and pension adjustments. The following table presents the changes in each component of accumulated other comprehensive income (loss) during the year ended August 31, 2017 (in millions): Foreign Currency Items Defined Benefit Pension Plans Accumulated Other Comprehensive Loss Items Balance at August 31, 2016 $ (47.7 ) $ (91.7 ) $ (139.4 ) Other comprehensive income before reclassifications 19.0 12.6 31.6 Amounts reclassified from accumulated other comprehensive loss — 8.1 8.1 Net current period other comprehensive income 19.0 20.7 39.7 Balance at August 31, 2017 $ (28.7 ) $ (71.0 ) $ (99.7 ) The following table presents the tax expense or benefit allocated to each component of other comprehensive income (loss) for the three years ended August 31, 2017 (in millions): Year Ended August 31, 2017 2016 2015 Before Tax Amount Tax (Expense) or Benefit Net of Tax Amount Before Tax Amount Tax (Expense) or Benefit Net of Tax Amount Before Tax Amount Tax (Expense) or Benefit Net of Tax Amount Foreign currency translation adjustments $ 19.0 $ — $ 19.0 $ (5.6 ) $ — $ (5.6 ) $ (24.0 ) $ — $ (24.0 ) Defined benefit pension plans: Actuarial gains (losses) 18.3 (5.7 ) 12.6 (42.2 ) 13.5 (28.7 ) (27.9 ) 10.7 (17.2 ) Amortization of defined benefit pension items: Prior service cost (1) 3.1 (0.7 ) 2.4 3.1 (1.1 ) 2.0 1.4 (0.6 ) 0.8 Actuarial losses (1) 8.9 (3.2 ) 5.7 4.9 (1.6 ) 3.3 4.1 (2.2 ) 1.9 Total defined benefit plans, net 30.3 (9.6 ) 20.7 (34.2 ) 10.8 (23.4 ) (22.4 ) 7.9 (14.5 ) Other comprehensive income (loss) $ 49.3 $ (9.6 ) $ 39.7 $ (39.8 ) $ 10.8 $ (29.0 ) $ (46.4 ) $ 7.9 $ (38.5 ) _______________________________________ (1) The before tax amount of these other comprehensive income (loss) components is included in net periodic pension cost. See the Pension and Defined Contribution Plans footnote for additional details.

New Accounting Pronouncements

New Accounting Pronouncements	12 Months Ended
	Aug. 31, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Pronouncements	New Accounting Pronouncements Accounting Standards Adopted in Fiscal 2017 In January 2017, the Financial Accounting Standards Board (“FASB”) issued ASU 2017-04. This guidance eliminates the requirement to determine the implied fair value of goodwill to measure an impairment of goodwill. Rather, goodwill impairment charges will be calculated as the amount by which a reporting unit's carrying amount exceeds its fair value. Adoption of the provisions in ASU 2017-04 is required for the Company for its annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company adopted ASU 2017-04 effective beginning in the current period. The provisions of ASU 2017-04 did not have a material effect on the Company's financial condition, results of operations, or cash flows. In July 2015, the FASB issued ASU No. 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments (“ASU 2015-16”), which simplifies the accounting for measurement-period adjustments to provisional amounts recognized in a business combination. ASU 2015-16 eliminates the requirement to retrospectively account for adjustments made to provisional amounts recorded in connection with a business combination and is effective for fiscal years (and interim reporting periods within those years) beginning after December 15, 2015. The Company adopted ASU 2015-16 this fiscal year and presented all adjustments to provisional amounts recorded in connection within a business combination in fiscal 2017 prospectively. In April 2015, the FASB issued ASU No. 2015-05, Customer's Accounting For Fees Paid In A Cloud Computing Arrangement (“ASU 2015-05”), which provides guidance for a customer's accounting for cloud computing costs. ASU 2015-05 is effective for fiscal years (and interim reporting periods within those years) beginning after December 15, 2015. The Company adopted ASU 2015-05 during fiscal 2017 . The provisions of ASU 2015-05 did not have a material effect on the Company's financial condition, results of operations, or cash flows. Accounting Standards Yet to Be Adopted In March 2017, the FASB issued ASU No. 2017-07, Compensation — Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (“ASU 2017-07”), which will change the presentation of net periodic benefit cost related to employer sponsored defined benefit plans and other postretirement benefits. Service cost will be included within the same income statement line item as other compensation costs arising from services rendered during the period, while other components of net periodic benefit pension cost will be presented separately outside of operating income. Additionally, only service costs may be capitalized in assets. ASU 2017-07 is effective for fiscal years (and interim reporting periods within those years) beginning after December 15, 2017. The provisions of ASU 2017-07 are not expected to have a material effect on the Company's financial condition, results of operations, or cash flows. In January 2017, the FASB issued ASU No. 2017-01, Clarifying the Definition of a Business (“ASU 2017-01”), which requires an evaluation of whether substantially all of the fair value of assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets. If so, the transaction does not qualify as a business. The guidance also requires an acquired business to include at least one substantive process and narrows the definition of outputs. The Company is required to apply this guidance to annual periods beginning after December 15, 2017, including interim periods within those periods. The Company is currently evaluating the impact of the provisions of ASU 2017-01 and intends to implement the standard as required in fiscal 2019. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (“ASU 2016-15”), which is intended to reduce the diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows including debt prepayment and extinguishment costs, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, and proceeds from the settlement of corporate-owned life insurance. ASU 2016-15 is effective for fiscal years (and interim reporting periods within those years) beginning after December 15, 2017. The Company intends to implement the standard as required in fiscal 2019, and the provisions of ASU 2016-15 are not expected to have a material impact on the Company's financial statement disclosures. In March 2016, the FASB issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting , (“ASU 2016-09”), which will change certain aspects of accounting for share-based payments to employees. ASU 2016-09 is effective for fiscal years (and interim reporting periods within those years) beginning after December 15, 2016. The standard requires that all excess tax benefits and deficiencies currently recorded as additional paid-in capital be prospectively recorded in income tax expense. As such, implementation of this standard could create volatility in the Company's effective income tax rate on a quarter by quarter basis. The volatility in the effective income tax rate is due primarily to fluctuations in the Company's stock price and the timing of stock option exercises and vesting of restricted share grants. The standard also requires excess tax benefits to be presented as an operating activity on the statement of cash flows rather than as a financing activity and taxes paid for employee withholdings to be presented as a financing activity. The Company will implement the standard as required in fiscal 2018. Excess tax benefits will be recorded within income tax expense on a prospective basis as required by the standard; however, the Company will elect to present changes to the statement of cash flows on a retrospective basis as allowed by the update in order to maintain comparability between fiscal years. In February 2016, the FASB issued ASU No. 2016-02, Leases (“ASU 2016-02”), which requires lessees to include most leases on the balance sheet. ASU 2016-02 is effective for fiscal years (and interim reporting periods within those years) beginning after December 15, 2018. The Company is currently evaluating the impact of the provisions of ASU 2016-02 and intends to implement the standard as required in fiscal 2020. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”), which will replace most existing revenue recognition guidance in U.S. GAAP. ASU 2014-09 outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. The standard also requires additional disclosures about the nature, timing, and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments. ASU 2014-09 permits two transition methods: the full retrospective method and the modified retrospective method. Under the full retrospective method, the standard would be applied to each prior reporting period presented with the cumulative effect of applying the standard recognized at the earliest period shown. Under the modified retrospective method, the cumulative effect of applying the standard would be recognized at the date of initial application. In March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers: Principal versus Agent Considerations (Reporting Revenue Gross versus Net) , which clarifies the guidance in ASU 2014-09 and has the same effective date as the original standard. During the three months ended July 1, 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers: Identifying Performance Obligations and Licensing; ASU 2016-11, Rescission of SEC Guidance Because of Accounting Standards Updates 2014-09 and 2014-16 Pursuant to Staff Announcements at the March 3, 2016 EITF Meeting; and ASU 2016-12, Revenue from Contracts with Customers: Narrow-Scope Improvements and Practical Expedients. These amendments are intended to improve and clarify the implementation guidance of ASU 2014-09 and have the same effective date as the original standard. The Company has an implementation team tasked with identifying potential differences that will result from applying the new revenue recognition standard to the Company's contracts with its customers. The implementation team reports the findings and progress of the project to management on a frequent basis and to the Audit Committee of the Board of Directors (the “Board”) on a quarterly basis. The implementation team has completed its initial phase of contract reviews and continues to evaluate the results of those reviews with respect to potential changes from adopting the new standard on the Company's consolidated financial statements. Management anticipates the most significant changes will relate to additional deferral of revenue recognition for certain services provided and the gross presentation of right of return assets and refund liabilities for sales with a right of return. Based on the current portfolio of the Company's revenue generating activities, these changes are not expected to have a material impact on the Company's consolidated financial condition, results of operations, or cash flows. Additionally, the implementation team is in the process of identifying appropriate changes to the Company's business processes, systems, and controls to support recognition and disclosure under the new standard. Based on the implementation team's current findings and the overall expected immaterial impact of adoption, the implementation team is currently evaluating which adoption method would provide the most meaningful information to the Company's stakeholders. The Company will adopt the requirements of the new standard no later than the effective date of September 1, 2018. All other newly issued accounting pronouncements not yet effective have been deemed either immaterial or not applicable.

Acquisitions and Investments

Acquisitions and Investments	12 Months Ended
	Aug. 31, 2017
Business Combinations [Abstract]
Acquisitions and Investments	Acquisitions and Investments The Company does not consider acquisitions a critical element of its strategy but seeks opportunities for growth through acquisitions and investments. In recent years, the Company has acquired or made investments in a number of businesses that participate in the lighting, building management, and related markets, including the businesses discussed below. The acquisitions and investments were made with the intent to further expand and complement the Company’s lighting and building management solutions portfolio. The purchased companies were fully incorporated into the Company’s operations at their respective acquisition dates. There were no acquisitions during fiscal 2017. Fiscal 2016 Acquisitions DGLogik, Inc. On June 30, 2016, using cash on hand and treasury stock, the Company acquired DGLogik, a provider of innovative software solutions that enable and visualize the IoT. DGLogik's solutions provide users with the intelligence to better manage energy usage and improve facility performance. DGLogik is headquartered in the San Francisco Bay Area, California. The operating results of DGLogik have been included in the Company's consolidated financial statements since the date of acquisition and are not material to the Company's financial condition, results of operations, or cash flows. The Company finalized the acquisition accounting for DGLogik during fiscal 2017, and the amounts are reflected on the Consolidated Balance Sheets . There were no material changes to the Company’s financial statements as a result of the finalization of the acquisition accounting. Juno Lighting LLC On December 10, 2015, using cash on hand, the Company acquired for approximately $380.0 million all of the equity interests of Juno Lighting, a leading provider of downlighting and track lighting fixtures for both residential and commercial applications. Juno Lighting is headquartered in Des Plaines, Illinois.The operating results of Juno Lighting have been included in the Company's consolidated financial statements since the date of acquisition. Provisional amounts recognized at the acquisition date related to the Juno Lighting acquisition were prospectively adjusted in the second quarter of fiscal 2017 to reflect the finalization of the valuation of customer relationships and certain accrued liabilities. These adjustments resulted in an increase to intangible assets, net of $81.1 million , a decrease to goodwill of $50.5 million , an increase to deferred income tax liabilities of $29.6 million , and a decrease to net operating working capital of $1.0 million in the second quarter. Additionally, the Company recorded $1.5 million of additional amortization expense during fiscal 2017 to reflect the amortization that would have been recognized in previous periods if the adjustment to intangibles was recognized as of the acquisition date. The fair values of assets acquired and liabilities assumed were finalized and reflected on the Consolidated Balance Sheets prospectively as of February 28, 2017. Geometri LLC On December 9, 2015, using cash on hand, the Company acquired certain assets and assumed certain liabilities of Geometri, LLC (“Geometri”), a provider of a software and services platform for mapping, navigation, and analytics. The operating results of Geometri have been included in the Company’s consolidated financial statements since the date of acquisition. The Company finalized the acquisition accounting for Geometri during fiscal 2017, and the amounts are reflected on the Consolidated Balance Sheets . There were no material changes to the Company’s financial statements as a result of the finalization of the acquisition accounting. Distech Controls Inc. On September 1, 2015, using cash on hand, the Company acquired for approximately $240.0 million all of the outstanding capital stock of Distech Controls Inc. (“Distech Controls”), a provider of building automation solutions that allow for the integration of lighting, HVAC, access control, closed circuit television, and related systems. Distech Controls is headquartered in Quebec, Canada. The Company finalized the acquisition accounting for Distech Controls during fiscal 2016, and the amounts are reflected on the Consolidated Balance Sheets . There were no material changes to the Company’s financial statements as a result of the finalization of the acquisition accounting. Fiscal 2015 Acquisition On April 15, 2015, using cash on hand, the Company acquired substantially all of the assets and assumed certain liabilities of ByteLight, Inc. (“ByteLight”), a provider of indoor location software for light-emitting diode (“LED”) lighting. The operating results of ByteLight have been included in the Company's consolidated financial statements since the date of acquisition. Management finalized the acquisition accounting for ByteLight during the fourth quarter of fiscal 2015, and the amounts are reflected in the Consolidated Balance Sheets.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Aug. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The Company determines fair value measurements based on the assumptions a market participant would use in pricing an asset or liability. ASC Topic 820, Fair Value Measurements and Disclosures (“ASC 820”), establishes a three level hierarchy making a distinction between market participant assumptions based on (i) unadjusted quoted prices for identical assets or liabilities in an active market (Level 1), (ii) quoted prices in markets that are not active or inputs that are observable either directly or indirectly for substantially the full term of the asset or liability (Level 2), and (iii) prices or valuation techniques that require inputs that are both unobservable and significant to the overall fair value measurement (Level 3). The Company's cash and cash equivalents (Level 1), which are required to be carried at fair value and measured on a recurring basis, were $311.1 million and $413.2 million as of August 31, 2017 and 2016 , respectively. The Company utilizes valuation methodologies to determine the fair values of its financial assets and liabilities in conformity with the concepts of “exit price” and the fair value hierarchy as prescribed in ASC 820. All valuation methods and assumptions are validated at least quarterly to ensure the accuracy and relevance of the fair values. There were no material changes to the valuation methods or assumptions used to determine fair values during the current period. The Company used quoted market prices to determine the fair value of Level 1 assets and liabilities. No transfers between the levels of the fair value hierarchy occurred during the current fiscal period. In the event of a transfer in or out of a level within the fair value hierarchy, the transfers would be recognized on the date of occurrence. Disclosures of fair value information about financial instruments (whether or not recognized in the balance sheet), for which it is practicable to estimate that value, are required each reporting period in addition to any financial instruments carried at fair value on a recurring basis as prescribed by ASC Topic 825, Financial Instruments (“ASC 825”). In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. The carrying values and estimated fair values of certain of the Company’s financial instruments were as follows at August 31, 2017 and 2016 (in millions): August 31, 2017 August 31, 2016 Carrying Value Fair Value Carrying Value Fair Value Assets: Investment in noncontrolling affiliate $ — $ — $ 8.0 $ 14.4 Liabilities: Senior unsecured public notes, net of unamortized discount and deferred costs $ 349.1 $ 379.7 $ 348.7 $ 388.8 Industrial revenue bond 4.0 4.0 4.0 4.0 Bank Loans 3.8 3.8 2.5 2.6 Investment in noncontrolling affiliate represents a strategic investment accounted for using the cost method. The Company based the fair value of the investment as of August 31, 2016 on an offer by a third party to purchase the business (Level 3). The Company sold the investment during October 2016, resulting in the recognition of a gain of $7.2 million , which is reflected in Miscellaneous (income) expense, net in the Consolidated Statements of Comprehensive Income . The senior unsecured public notes are carried at the outstanding balance, net of unamortized bond discount and deferred costs, as of the end of the reporting period. Fair value is estimated based on discounted future cash flows using rates currently available for debt of similar terms and maturity (Level 2). The industrial revenue bond is carried at the outstanding balance as of the end of the reporting period. The industrial revenue bond is a tax-exempt, variable-rate instrument that resets on a weekly basis; therefore, the Company estimates that the face amount of the bond approximates fair value as of August 31, 2017 based on bonds of similar terms and maturity (Level 2). The bank loans are carried at the outstanding balance as of the end of the reporting period. Fair value is estimated based on discounted future cash flows using rates currently available for debt of similar terms and maturity (Level 2). ASC 825 excludes certain financial instruments and all nonfinancial instruments from its disclosure requirements. Accordingly, the aggregate fair value amounts presented do not represent the underlying value to the Company. In many cases, the fair value estimates cannot be substantiated by comparison to independent markets, nor can the disclosed value be realized in immediate settlement of the instruments. In evaluating the Company’s management of liquidity and other risks, the fair values of all assets and liabilities should be taken into consideration, not only those presented above.

Pension and Defined Contributio

Pension and Defined Contribution Plans	12 Months Ended
	Aug. 31, 2017
Retirement Benefits [Abstract]
Pension and Defined Contribution Plans	Pension and Defined Contribution Plans Company-sponsored Pension Plans The Company has several pension plans, both qualified and non-qualified, covering certain hourly and salaried employees. Benefits paid under these plans are based generally on employees’ years of service and/or compensation during the final years of employment. The Company makes annual contributions to the plans to the extent indicated by actuarial valuations and statutory requirements. Plan assets are invested primarily in equity and fixed income securities. The following tables reflect the status of the Company’s domestic (U.S.-based) and international pension plans at August 31, 2017 and 2016 (in millions): Domestic Plans International Plans August 31, August 31, 2017 2016 2017 2016 Change in benefit obligation: Benefit obligation at beginning of year $ 223.0 $ 192.2 $ 57.3 $ 49.8 Service cost 3.5 3.6 0.2 0.1 Interest cost 6.9 8.0 1.1 1.7 Actuarial (gain) loss (10.2 ) 27.5 (3.2 ) 17.9 Benefits paid (7.7 ) (8.3 ) (1.0 ) (3.6 ) Other — — (0.9 ) (8.6 ) Benefit obligation at end of year 215.5 223.0 53.5 57.3 Change in plan assets: Fair value of plan assets at beginning of year $ 128.8 $ 123.9 $ 30.3 $ 32.6 Actual return on plan assets 12.1 7.9 4.1 5.2 Employer contributions 3.6 5.3 1.0 1.1 Benefits paid (7.7 ) (8.3 ) (1.0 ) (3.6 ) Other — — (0.3 ) (5.0 ) Fair value of plan assets at end of year 136.8 128.8 34.1 30.3 Funded status at the end of year $ (78.7 ) $ (94.2 ) $ (19.4 ) $ (27.0 ) Amounts recognized in the consolidated balance sheets consist of: Current liabilities $ (1.2 ) $ (1.3 ) $ — $ — Non-current liabilities (77.5 ) (92.9 ) (19.4 ) (27.0 ) Net amount recognized in Consolidated Balance Sheets $ (78.7 ) $ (94.2 ) $ (19.4 ) $ (27.0 ) Accumulated benefit obligation $ 215.3 $ 220.4 $ 53.5 $ 57.3 Pre-tax amounts in accumulated other comprehensive income: Prior service cost $ (7.7 ) $ (10.8 ) $ — $ — Net actuarial loss (78.7 ) (96.9 ) (18.2 ) (28.2 ) Amounts in accumulated other comprehensive income $ (86.4 ) $ (107.7 ) $ (18.2 ) $ (28.2 ) Estimated amounts that will be amortized from accumulated comprehensive income over the next fiscal year: Prior service cost $ 3.1 $ 3.1 $ — $ — Net actuarial loss 4.5 5.3 2.2 3.7 Components of net periodic pension cost for the fiscal years ended August 31, 2017 , 2016 , and 2015 included the following (in millions): Domestic Plans International Plans 2017 2016 2015 2017 2016 2015 Service cost $ 3.5 $ 3.6 $ 3.1 $ 0.2 $ 0.1 $ 0.1 Interest cost 6.9 8.0 6.8 1.1 1.7 1.8 Expected return on plan assets (9.4 ) (9.2 ) (9.2 ) (1.9 ) (1.9 ) (1.8 ) Amortization of prior service cost 3.1 3.1 1.4 — — — Recognized actuarial loss 5.3 3.0 2.2 3.6 1.9 1.9 Net periodic pension cost $ 9.4 $ 8.5 $ 4.3 $ 3.0 $ 1.8 $ 2.0 Weighted average assumptions used in computing the benefit obligation are as follows: Domestic Plans International Plans 2017 2016 2017 2016 Discount rate 3.5 % 3.2 % 2.5 % 2.1 % Rate of compensation increase 5.5 % 5.5 % 3.2 % 2.8 % Weighted average assumptions used in computing net periodic benefit cost are as follows: Domestic Plans International Plans 2017 2016 2015 2017 2016 2015 Discount rate 3.2 % 4.3 % 4.0 % 2.1 % 2.1 % 3.6 % Expected return on plan assets 7.5 % 7.5 % 7.5 % 6.5 % 6.5 % 5.6 % Rate of compensation increase 5.5 % 5.5 % 5.5 % 3.2 % 2.8 % 3.1 % It is the Company’s policy to adjust, on an annual basis, the discount rate used to determine the projected benefit obligation to approximate rates on high-quality, long-term obligations based on the Company’s estimated benefit payments available as of the measurement date. The Company uses a publicly published yield curve to assist in the development of its discount rates. The Company estimates that each 100 basis point increase in the discount rate would result in reduced net periodic pension cost of approximately $1.2 million each for the domestic plans and international plans. The expected return on plan assets is derived from a periodic study of long-term historical rates of return on the various asset classes included in the Company’s targeted pension plan asset allocation. The Company estimates that each 100 basis point reduction in the expected return on plan assets would result in additional net periodic pension cost of $1.4 million and $0.3 million for domestic plans and international plans, respectively. The rate of compensation increase is also evaluated and adjusted by the Company, if necessary, annually. The Company’s investment objective for domestic plan assets is to earn a rate of return sufficient to match or exceed the long-term growth of the plans’ liabilities without subjecting plan assets to undue risk. The plan assets are invested primarily in high quality equity and debt securities. The Company conducts a periodic strategic asset allocation study to form a basis for the allocation of pension assets between various asset categories. Specific allocation percentages are assigned to each asset category with minimum and maximum ranges established for each. The assets are then managed within these ranges. During fiscal 2017 , the U.S. targeted asset allocation was 55% equity securities, 40% fixed income securities, and 5% real estate securities. The Company’s investment objective for the international plan assets is also to add value by matching or exceeding the long-term growth of the plans’ liabilities. During fiscal 2017 , the international asset target allocation approximated 62% equity securities, 23% fixed income securities, 10% multi-strategy funds, and 5% real estate securities. The Company’s pension plan asset allocation at August 31, 2017 and 2016 by asset category is as follows: % of Plan Assets Domestic Plans International Plans 2017 2016 2017 2016 Equity securities 58.1 % 55.4 % 63.9 % 61.1 % Fixed income securities 37.2 % 39.1 % 23.2 % 25.0 % Multi-strategy investments — % — % 8.2 % 8.9 % Real estate 4.7 % 5.5 % 4.7 % 5.0 % Total 100.0 % 100.0 % 100.0 % 100.0 % The Company’s pension plan assets are stated at fair value from quoted market prices in an active market, quoted redemption values, or estimates based on reasonable assumptions as of the most recent measurement period. See the Fair Value Measurements footnote for a description of the fair value guidance. No transfers between the levels of the fair value hierarchy occurred during the current fiscal period. In the event of a transfer in or out of a level within the fair value hierarchy, the transfers would be recognized on the date of occurrence. The following tables present the fair value of the domestic pension plan assets by major category as of August 31, 2017 and 2016 (in millions): Fair Value Measurements Fair Value as of Quoted Market Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs August 31, 2017 (Level 1) (Level 2) (Level 3) Mutual funds: Domestic large cap equity fund $ 43.4 $ 43.4 $ — $ — Foreign equity fund 21.5 21.5 — — Real estate fund 6.4 — — 6.4 Short-term fixed income investments 4.7 4.7 — — Fixed-income investments 46.2 — 46.2 — Collective trust: domestic small cap equities 14.6 — 14.6 — $ 136.8 Fair Value Measurements Fair Value as of Quoted Market Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs August 31, 2016 (Level 1) (Level 2) (Level 3) Mutual funds: Domestic large cap equity fund $ 46.5 $ 46.5 $ — $ — Foreign equity fund 12.3 12.3 — — Real estate fund 7.1 — — 7.1 Short-term fixed income investments 6.2 6.2 — — Fixed-income investments 44.2 — 44.2 — Collective trust: Domestic small cap equities 12.5 — 12.5 — $ 128.8 The following tables present the fair value of the international pension plan assets by major category as of August 31, 2017 and 2016 (in millions): Fair Value Measurements Fair Value as of Quoted Market Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs August 31, 2017 (Level 1) (Level 2) (Level 3) Equity securities $ 21.8 $ — $ 21.8 $ — Short-term investments 0.2 0.2 — — Real estate fund 1.6 — — 1.6 Multi-strategy investments 2.8 — 2.8 — Fixed-income investments 7.7 — 7.7 — $ 34.1 Fair Value Measurements Fair Value as of Quoted Market Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs August 31, 2016 (Level 1) (Level 2) (Level 3) Equity securities $ 18.5 $ — $ 18.5 $ — Short-term investments 0.5 0.5 — — Real estate fund 1.5 — — 1.5 Multi-strategy investments 2.7 — 2.7 — Fixed-income investments 7.1 — 7.1 — $ 30.3 Publicly-traded securities are valued at the last reported sales price on the last business day of the period. Investments traded in the over-the-counter market and listed securities for which no sale was reported on the last day of the period are valued at the last reported bid price. Investments in real estate are stated at estimated fair values based on the fund management’s valuations and upon appraisal reports prepared periodically by independent real estate appraisers. These investments are classified as Level 3 assets within the fair value hierarchy. The purpose of the appraisal is to estimate the fair value of the real estate as of a specific date based on the most probable price for which the appraised real estate will sell in a competitive market under all conditions requisite to a fair sale. Estimated fair value is based on (i) discounted cash flows using certain market assumptions, including holding period, discount rates, capitalization rates, rent and expense growth rates, future capital expenditures, and the ultimate sale of the property at the end of the holding period; (ii) the direct capitalization method; or (iii) the comparable sales method. The tables below present a rollforward of the domestic and international pension plans’ Level 3 assets for the years ended August 31, 2017 and 2016 (in millions): Domestic Real Estate Fund Year Ended August 31, 2017 2016 Balance, beginning of year $ 7.1 $ 6.3 Net unrealized gain relating to instruments still held at the reporting date 0.2 0.5 Shares sold (1.3 ) — Shares purchased, including from dividend reinvestment 0.4 0.3 Balance, end of year $ 6.4 $ 7.1 International Real Estate Fund Year Ended August 31, 2017 2016 Balance, beginning of year $ 1.5 $ 1.6 Net unrealized loss relating to instruments still held at the reporting date 0.1 (0.1 ) Balance, end of year $ 1.6 $ 1.5 The Company expects to contribute approximately $4.0 million and $1.1 million during fiscal 2018 to its domestic and international defined benefit plans, respectively. These amounts are based on the total contributions required during fiscal 2018 to satisfy current legal minimum funding requirements for qualified plans and estimated benefit payments for non-qualified plans. Benefit payments are made primarily from funded benefit plan trusts. Benefit payments are expected to be paid as follows for the years ending August 31 (in millions): Domestic Plans International Plans 2018 $ 8.3 $ 1.0 2019 8.4 1.0 2020 8.6 1.0 2021 12.3 1.1 2022 11.6 1.1 2023-2027 71.1 6.1 Multi-employer Pension Plans The Company contributes to two multi-employer defined benefit pension plans under the terms of collective-bargaining agreements that cover certain of its union-represented employees. The risks of participating in these multi-employer plans are different from single-employer plans in the following aspects: • Assets contributed to the multi-employer plan by one employer may be used to provide benefits to employees of other participating employers. • If a participating employer stops contributing to the plan, the unfunded obligations of the plan may be shared by the remaining participating employers. • If a participating employer chooses to stop participating in some of its multi-employer plans, the employer may be required to pay those plans an amount based on the underfunded status of the plan, referred to as a withdrawal liability. The Company’s contributions to these plans were $0.5 million , $0.7 million , and $0.5 million for the years ended August 31, 2017 , 2016 , and 2015 , respectively. During fiscal 2016 , as a result of closing a facility, the Company withdrew from one of these multi-employer pension plans and incurred a withdrawal liability of $3.9 million . During fiscal 2017 , the Company early settled this withdrawal liability. Defined Contribution Plans The Company also has defined contribution plans to which both employees and the Company make contributions. The cost to the Company for these plans was $8.0 million , $6.9 million , and $5.6 million for the years ended August 31, 2017 , 2016 , and 2015 , respectively. Employer matching amounts are allocated in accordance with the participants’ investment elections for elective deferrals. At August 31, 2017 , assets of the domestic defined contribution plans included shares of the Company’s common stock with a market value of approximately $12.2 million , which represented approximately 3.6% of the total fair market value of the assets in the Company’s domestic defined contribution plans.

Debt and Lines of Credit

Debt and Lines of Credit	12 Months Ended
	Aug. 31, 2017
Debt Disclosure [Abstract]
Debt and Lines of Credit	Debt and Lines of Credit Debt The Company’s debt at August 31, 2017 and 2016 consisted of the following (in millions): August 31, 2017 2016 Senior unsecured public notes due December 2019, principal $ 350.0 $ 350.0 Senior unsecured public notes due December 2019, unamortized discount and deferred costs (0.9 ) (1.3 ) Industrial revenue bond due June 2021 4.0 4.0 Bank loans 3.8 2.5 Total debt outstanding, net of unamortized discount and deferred costs $ 356.9 $ 355.2 Future principal payments of long-term debt are $0.4 million , $0.4 million , $350.5 million , $4.5 million , $0.4 million , and $1.6 million in fiscal 2018 , 2019 , 2020 , 2021 , 2022 , and after 2022 , respectively. On December 1, 2009, the Company announced a private offering by ABL, Acuity Brands’ wholly-owned principal operating subsidiary, of $350.0 million aggregate principal amount of senior unsecured notes due in fiscal 2020 (the “Unsecured Notes”). The Unsecured Notes are fully and unconditionally guaranteed on a senior unsecured basis by Acuity Brands and ABL IP Holding LLC (“ABL IP Holding,” and, together with Acuity Brands, the “Guarantors”), a wholly-owned subsidiary of Acuity Brands. The Unsecured Notes are senior unsecured obligations of ABL and rank equally in right of payment with all of ABL’s existing and future senior unsecured indebtedness. The guarantees of Acuity Brands and ABL IP Holding are senior unsecured obligations of Acuity Brands and ABL IP Holding and rank equally in right of payment with their other senior unsecured indebtedness. The Unsecured Notes bear interest at a rate of 6% per annum and were issued at a price equal to 99.797% of their face value for a term of 10 years . Interest on the Unsecured Notes is payable semi-annually on June 15 and December 15. Additionally, the Company capitalized $3.1 million of deferred issuance costs related to the Unsecured Notes that are being amortized over the 10 -year term of the Unsecured Notes. In accordance with the registration rights agreement by and between ABL and the Guarantors and the initial purchasers of the Unsecured Notes, ABL and the Guarantors filed a registration statement with the SEC for an offer to exchange the Notes for SEC-registered notes with substantially identical terms. The registration became effective on August 17, 2010, and all of the Unsecured Notes were exchanged. The $4.0 million industrial revenue bond matures in June 2021. The interest rate on the $4.0 million bond was approximately 0.9% at August 31, 2017 and 0.7% at August 31, 2016 . The Company also had $3.8 million outstanding under fixed-rate bank loans. These loans have interest rates between 0.8% and 2.0% and mature over 7 to 12 years, subject to monthly or quarterly repayment schedules. Lines of Credit On August 27, 2014, the Company executed a $250.0 million revolving credit facility (the “Revolving Credit Facility”). The Revolving Credit Facility will mature, and all amounts outstanding will be due and payable on August 27, 2019. The Company had no borrowings outstanding under the Revolving Credit Facility as of August 31, 2017 or August 31, 2016 . The Revolving Credit Facility contains financial covenants, including a minimum interest coverage ratio (“Minimum Interest Coverage Ratio”) and a leverage ratio (“Maximum Leverage Ratio”) of total indebtedness to earnings before interest, taxes, depreciation, and amortization expense (“EBITDA”), as such terms are defined in the Revolving Credit Facility agreement. These ratios are computed at the end of each fiscal quarter for the most recent 12-month period. The Revolving Credit Facility allows for a Minimum Interest Coverage Ratio of 2.50 and a Maximum Leverage Ratio of 3.50 , subject to certain conditions defined in the financing agreement. Generally, amounts outstanding under the Revolving Credit Facility bear interest at a “Eurocurrency Rate.” Eurocurrency rate advances can be denominated in a variety of currencies, including U.S. dollars, and amounts outstanding bear interest at a periodic fixed rate equal to the London Inter Bank Offered Rate (“LIBOR”) for the applicable currency plus a margin as determined by the Company's leverage ratio (“Applicable Margin”). The Applicable Margin is based on the Company’s leverage ratio, as defined in the Revolving Credit Facility, with such margin ranging from 1.000% to 1.575% . Additionally, the Company is required to pay certain fees in connection with the Revolving Credit Facility, including administrative service fees and an annual facility fee. The annual facility fee is payable quarterly in arrears and is determined by the Company’s leverage ratio as defined in the Revolving Credit Facility. This facility fee ranges from 0.125% to 0.300% of the aggregate $250.0 million commitment of the lenders under the Revolving Credit Facility. The Company was compliant with all financial covenants under the Revolving Credit Facility as of August 31, 2017 . As of August 31, 2017 , the Company had outstanding letters of credit totaling $10.3 million , primarily for securing collateral requirements under the Company's casualty insurance programs and providing credit support for the Company’s industrial revenue bond (not an outstanding amount under the Revolving Credit Facility). At August 31, 2017 , the Company had additional borrowing capacity under the Revolving Credit Facility of $244.7 million under the most restrictive covenant in effect at the time, which represents the full amount of the Revolving Credit Facility less outstanding letters of credit of $5.3 million issued under the Revolving Credit Facility. None of the Company’s existing debt instruments include provisions that would require an acceleration of repayments based solely on changes in the Company’s credit ratings.

Common Stock and Related Matter

Common Stock and Related Matters	12 Months Ended
	Aug. 31, 2017
Equity [Abstract]
Common Stock and Related Matters	Common Stock and Related Matters Common Stock Changes in common stock for the years ended August 31, 2017 , 2016 , and 2015 were as follows (amounts and shares in millions): Common Stock Shares Amount (At par) Balance at August 31, 2014 52.6 $ 0.5 Issuance of restricted stock grants, net of cancellations 0.2 — Stock options exercised 0.2 — Balance at August 31, 2015 53.0 $ 0.5 Issuance of restricted stock grants, net of cancellations 0.1 — Stock options exercised 0.3 — Balance at August 31, 2016 53.4 $ 0.5 Issuance of restricted stock grants, net of cancellations 0.1 — Stock options exercised — * — Balance at August 31, 2017 53.5 $ 0.5 ___________________________ * Represents shares of less than 0.1 million. As of August 31, 2017 and 2016 , the Company had 11.7 million and 9.7 million repurchased shares recorded as treasury stock at an original repurchase cost of $776.1 million and $418.6 million , respectively. During the current year, the Company purchased two million shares of the Company’s common stock, which completed the share repurchases previously authorized by the Board. In June 2017, the Board authorized the repurchase of an additional two million shares of the Company's outstanding common stock in the future. No shares have been repurchased under the new authorization. Preferred Stock The Company has 50 million shares of preferred stock authorized. No shares of preferred stock were issued in fiscal 2017 or 2016 , and no shares of preferred stock are outstanding. Earnings per Share Prior to fiscal 2017, basic earnings per share was computed by dividing net earnings available to common stockholders by the weighted average number of common shares outstanding, which was modified to include the effects of all participating securities during the period, as prescribed by the two-class method under ASC Topic 260, Earnings Per Share (“ASC 260”). Participating securities included unvested share-based payment awards with a right to receive nonforfeitable dividends. The equity plan approved by stockholders in January 2013 changed the dividend provisions, causing share-based payment awards to lose the right to receive nonforfeitable dividends. Due to this change, any shares granted after January 2013 were not participating securities as prescribed by the two-class method under ASC 260 and were accounted for in the diluted earnings per share calculation described below. Income attributable to participating securities was $0.4 million and $1.0 million for the years ended August 31, 2016 and 2015 , respectively. The impact of participating securities was not material for the year ended August 31, 2017 . Therefore, basic earnings per share for this period is computed by dividing net earnings available to common stockholders by the weighted average number of common shares outstanding. Diluted earnings per share is computed similarly but reflects the potential dilution that would occur if dilutive options were exercised, all unvested share-based payment awards were vested, and other distributions related to deferred stock agreements were incurred. The following table calculates basic earnings per common share and diluted earnings per common share for the years ended August 31, 2017 , 2016 , and 2015 (in millions, except per share data): Year Ended August 31, 2017 2016 2015 Net income $ 321.7 $ 290.8 $ 222.1 Basic weighted average shares outstanding 43.1 43.5 43.1 Common stock equivalents 0.2 0.3 0.3 Diluted weighted average shares outstanding 43.3 43.8 43.4 Basic earnings per share $ 7.46 $ 6.67 $ 5.13 Diluted earnings per share $ 7.43 $ 6.63 $ 5.09 Stock options of approximately 117,000 , 40,000 , and 44,000 were excluded from the diluted earnings per share calculation for the years ended August 31, 2017 , 2016 , and 2015 , respectively, as the effect of inclusion would have been antidilutive. Restricted stock shares of approximately 99,000 , 4,000 , and 26,000 , were excluded from the diluted earnings per share calculation for the years ended August 31, 2017 , 2016 , and 2015 , respectively, as the effect of inclusion would have been antidilutive.

Share-Based Payments

Share-Based Payments	12 Months Ended
	Aug. 31, 2017
Share-based Compensation [Abstract]
Share-Based Payments	Share-based Payments Omnibus Stock Compensation Incentive and Directors’ Equity Plans In January 2013, the Company’s stockholders approved the Acuity Brands, Inc. 2012 Omnibus Stock Compensation Incentive Plan (“2012 Plan”). The approval authorized an aggregate of 2.3 million shares for future award grants and allowed 1.7 million shares related to outstanding awards granted under a previous plan to become issuable under the 2012 Plan to the extent that such awards are forfeited, terminated, canceled, or otherwise expire. Shares available for grant under the 2012 Plan were approximately 1.4 million , 1.6 million , and 1.8 million at August 31, 2017 , 2016 , and 2015 , respectively. Forfeited shares are returned to the pool of shares available for grant. Restricted Stock Awards As of August 31, 2017 , the Company had approximately 384,000 shares outstanding of restricted stock to officers, directors, and other key employees under the 2012 Plan, including restricted stock units granted to foreign employees. The shares vest primarily over a four -year period and are valued at the closing stock price on the date of the grant. Compensation expense recognized related to the awards under the equity incentive plans was $27.2 million , $23.7 million , and $14.8 million in fiscal 2017 , 2016 , and 2015 , respectively. Activity related to restricted stock awards during the fiscal year ended August 31, 2017 was as follows (in millions, except per share data): Number of Shares Weighted Average Grant Date Fair Value Per Share Outstanding at August 31, 2016 0.4 $ 159.50 Granted 0.1 $ 239.59 Vested (0.1) $ 138.50 Outstanding at August 31, 2017 0.4 $ 197.41 As of August 31, 2017 , there was $54.4 million of total unrecognized compensation cost related to unvested restricted stock, which is expected to be recognized over a weighted-average period of 1.7 years. The total weighted average fair value of shares vested during the years ended August 31, 2017 , 2016 , and 2015 , was approximately $24.8 million , $18.8 million , and $14.3 million , respectively. Stock Options As of August 31, 2017 , the Company had approximately 322,000 options outstanding to officers and other key employees under the 2012 Plan. Options issued under the 2012 Plan are generally granted with an exercise price equal to the fair market value of the Company’s stock on the date of grant (but never less than the fair market value on the grant date) and expire 10 years from the date of grant. These options generally vest and become exercisable over a three -year period. Compensation expense recognized related to the awards under the current and prior equity incentive plans was $3.6 million , $2.9 million , and $2.4 million in fiscal 2017 , 2016 , and 2015 , respectively. The fair value of each option was estimated on the date of grant using the Black-Scholes model. The dividend yield was calculated based on annual dividends paid and the trailing 12-month average closing stock price at the time of grant. Expected volatility was based on historical volatility of the Company’s stock, calculated using the most recent time period equal to the expected life of the options. The risk-free interest rate was based on the U.S. Treasury yield for a term equal to the expected life of the options at the time of grant. The Company used historical exercise behavior data of similar employee groups to determine the expected life of options. All inputs into the Black-Scholes model are estimates made at the time of grant. Actual realized value of each option grant could materially differ from these estimates, without impact to future reported net income. The following weighted average assumptions were used to estimate the fair value of stock options granted in the fiscal years ended August 31: 2017 2016 2015 Dividend yield 0.2% 0.3% 0.4% Expected volatility 28.5% 30.7% 33.9% Risk-free interest rate 1.3% 1.4% 1.5% Expected life of options 4 years 4 years 4 years Weighted-average fair value of options $57.40 $52.83 $37.43 Stock option activity during the years ended August 31, 2017 , 2016 , and 2015 was as follows: Outstanding Exercisable Number of Shares (in millions) Weighted Average Exercise Price Number of Shares (in millions) Weighted Average Exercise Price Outstanding at August 31, 2014 0.7 $50.58 0.5 $41.05 Granted 0.1 $135.63 Exercised (0.3) $39.35 Outstanding at August 31, 2015 0.5 $71.95 0.3 $51.05 Granted 0.1 $207.80 Exercised (0.3) $51.34 Outstanding at August 31, 2016 0.3 $129.85 0.1 $83.89 Granted — * 239.76 Exercised — * 139.69 Outstanding at August 31, 2017 0.3 156.43 0.2 106.54 Range of option exercise prices: $40.01 - $100.00 (average life - 5 years) 0.1 $61.59 0.1 $61.59 $100.01 - $160.00 (average life - 6.7 years) 0.1 $121.77 0.1 $117.73 $160.01 - $210.00 (average life - 8.2 years) 0.1 $207.80 — * $207.80 $210.01 - $239.76 (average life - 9.1 years) — * $239.76 — — ___________________________ * Represents shares of less than 0.1 million. The total intrinsic value of options exercised during the years ended August 31, 2017 , 2016 , and 2015 was $1.3 million , $50.0 million , and $33.3 million , respectively. As of August 31, 2017 , the total intrinsic value of options outstanding was $13.6 million , the total intrinsic value of options expected to vest was $13.6 million , and the total intrinsic value of options exercisable was $12.6 million . As of August 31, 2017 , there was $4.8 million of total unrecognized compensation cost related to unvested options. That cost is expected to be recognized over a weighted-average period of approximately 1.3 years. Employee Deferred Share Units The Company previously allowed employees to defer a portion of restricted stock awards granted in fiscal 2003 and fiscal 2004 into the SDSP as share units. The share units are payable in shares of stock at the time of distribution from the SDSP. As of August 31, 2017 , approximately 9,000 fully vested share units remain deferred, but undistributed, under the 2012 Plan. There was no compensation expense related to these share units during fiscal years 2017 , 2016 , and 2015 . Director Deferred Share Units The Company previously required its Directors to defer at least 50% of their annual retainer into the 2006 Nonemployee Director Deferred Compensation Plan (“2006 Plan”). Shares deferred under the 2006 Plan are to be paid in shares at retirement from the Board. In January 2012, the Company's stockholders approved the 2011 Nonemployee Director Deferred Compensation Plan (“2011 Plan”), following the expiration of the 2006 Plan on November 30, 2011. Pursuant to the 2011 Plan, fees deferred by nonemployee directors can be invested in deferred stock units to be paid in shares or credited to an interest-bearing account to be paid in cash at retirement from the Board. 300,000 shares of common stock were reserved for issuance under the 2011 Plan, which incorporated approximately 86,000 shares previously available for grant under the 2006 Plan. Beginning in fiscal year 2013, the deferral requirement was adjusted to 55% of the annual director fees. On September 28, 2012, the 2011 Plan was amended to allow for stock grants in lieu of mandatory deferrals for the non-cash component of a nonemployee director's annual fee if a director exceeds the stock ownership requirement of five-times the annual cash retainer fee. Total shares available for issuance under both plans were approximately 390,000 at August 31, 2017 , and 400,000 at August 31, 2016 and 2015 . As of August 31, 2017 , approximately 132,000 share units were deferred, but undistributed, under the 2006 Plan and the 2011 Plan. Compensation expense recognized related to the share units under these plans was $1.2 million , $1.1 million , and $1.0 million in fiscal 2017 , 2016 , and 2015 , respectively. Employee Stock Purchase Plan Employees are able to purchase, through payroll deduction, common stock at a 5% discount on a monthly basis. There were 1.5 million shares of the Company’s common stock reserved for purchase under the plan, of which approximately 1.0 million shares remain available as of August 31, 2017 . Employees may participate at their discretion.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Aug. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Self-Insurance It is the policy of the Company to self-insure, up to certain limits, traditional risks, including workers’ compensation, comprehensive general liability, and auto liability. The Company’s self-insured retention for each claim involving workers’ compensation, comprehensive general liability (including product liability claims), and auto liability is limited per occurrence of such claims. A provision for claims under this self-insured program, based on the Company’s estimate of the aggregate liability for claims incurred, is revised and recorded annually. The estimate is derived from both internal and external sources including, but not limited to, the Company’s independent actuary. The Company is also self-insured up to certain limits for certain other insurable risks, primarily physical loss to property and business interruptions resulting from such loss lasting two days or more in duration. Insurance coverage is maintained for catastrophic property and casualty exposures, as well as those risks required to be insured by law or contract. The Company is fully self-insured for certain other types of liabilities, including environmental, product recall, warranty, and patent infringement. The actuarial estimates are subject to uncertainty from various sources including, among others, changes in claim reporting patterns, claim settlement patterns, judicial decisions, legislation, and economic conditions. Although the Company believes that the actuarial estimates are reasonable, significant differences related to the items noted above could materially affect the Company’s self-insurance obligations, future expense, and cash flow. The Company is also self-insured for the majority of its medical benefit plans up to certain limits. The Company estimates its aggregate liability for claims incurred by applying a lag factor to the Company’s historical claims and administrative cost experience. The appropriateness of the Company’s lag factor is evaluated and revised annually, as necessary. Leases The Company leases certain of its buildings and equipment under noncancelable lease agreements. Future minimum annual lease payments under noncancelable leases are $16.2 million , $14.0 million , $11.9 million , $9.6 million , $6.2 million , and $11.4 million for fiscal 2018 , 2019 , 2020 , 2021 , 2022 , and after 2022 , respectively. Total rent expense was $20.0 million , $17.6 million , and $16.0 million in fiscal 2017 , 2016 , and 2015 , respectively. Purchase Obligations The Company incurs purchase obligations in the ordinary course of business that are enforceable and legally binding. Obligations for years subsequent to August 31, 2017 include $238.7 million in fiscal 2018 . As of August 31, 2017 , the Company had no purchase obligations extending beyond August 31, 2018 . Collective Bargaining Agreements Approximately 76% of the Company’s total work force is covered by collective bargaining agreements. Collective bargaining agreements representing approximately 56% of the Company’s work force will expire within one year, primarily due to annual negotiations with unions in Mexico. Litigation The Company is subject to various legal claims arising in the normal course of business, including patent infringement, employment matters, and product liability claims. Based on information currently available, it is the opinion of management that the ultimate resolution of pending and threatened legal proceedings will not have a material adverse effect on the financial condition, results of operations, or cash flows of the Company. However, in the event of unexpected future developments, it is possible that the ultimate resolution of any such matters, if unfavorable, could have a material adverse effect on the financial condition, results of operations, or cash flows of the Company in future periods. The Company establishes reserves for legal claims when associated costs become probable and can be reasonably estimated. The actual costs of resolving legal claims may be substantially higher than the amounts reserved for such claims. However, the Company cannot make a meaningful estimate of actual costs to be incurred that could possibly be higher or lower than the amounts reserved. Environmental Matters The operations of the Company are subject to numerous comprehensive laws and regulations relating to the generation, storage, handling, transportation, and disposal of hazardous substances, as well as solid and hazardous wastes, and to the remediation of contaminated sites. In addition, permits and environmental controls are required for certain of the Company’s operations to limit air and water pollution, and these permits are subject to modification, renewal, and revocation by issuing authorities. On an ongoing basis, the Company invests capital and incurs operating costs relating to environmental compliance. Environmental laws and regulations have generally become stricter in recent years. The Company is not aware of any pending legislation or proposed regulation related to environmental issues that would have a material adverse effect on the Company. The cost of responding to future changes may be substantial. The Company establishes reserves for known environmental claims when the associated costs become probable and can be reasonably estimated. The actual cost of environmental issues may be substantially higher than that reserved due to difficulty in estimating such costs. Guarantees and Indemnities The Company is a party to contracts entered into in the normal course of business in which it is common for the Company to agree to indemnify third parties for certain liabilities that may arise out of or relate to the subject matter of the contract. In most cases, the Company cannot estimate the potential amount of future payments under these indemnities until events arise that would result in a liability under the indemnities. Acquisition-Related Liabilities During the negotiations related to business combinations, the previous owners of the acquired entity (“acquiree”) typically indemnify the Company for specific unrecognized liabilities of the acquiree in existence as of the date of acquisition. For some acquisitions of businesses, the Company acts in the place of escrow agents in the holding of funds, including accrued interest (collectively, the “holdback funds”), used to fulfill pre-acquisition obligations agreed to be paid by the acquiree. These funds represent consideration given to the previous owners of the businesses acquired and are payable to them, net of any pre-acquisition obligations satisfied within a stated amount of time, at a future date. Any potential pre-acquisition obligations for which the Company may be reimbursed through the holdback funds are usually uncertain as of the date of the change of control. In certain circumstances, the Company is capable of the identification and quantification of particular liabilities including, but not limited to, uncertain tax positions, legal issues, and other outstanding obligations not recognized in the financial statements of the acquired entity. Under ASC Topic 805, Business Combinations , these unrecognized liabilities are recorded as obligations of the Company with a corresponding receivable due from the previous owners as of the date of acquisition and are included as part of the acquisition accounting. The actual costs of resolving pre-acquisition obligations may be substantially higher than the holdback funds or amounts reserved. The Company does not believe that any amounts it is likely to be required to pay under these acquisition-related liabilities, including net holdback funds, will be material to the Company’s financial position, results of operations, or cash flow. Product Warranty and Recall Costs The Company's products generally have a standard warranty term of five years. The Company records an allowance for the estimated amount of future warranty costs when the related revenue is recognized. Estimated costs related to product recalls based on a formal campaign soliciting repair or return of that product are accrued when they are deemed to be probable and can be reasonably estimated. Estimated future warranty and recall costs are primarily based on historical experience of identified warranty and recall claims. In certain limited cases, the Company has warranty arrangements for terms that exceed the standard term. Given that these longer-term warranties are not included in the Company’s historical experience, the Company utilizes estimated failure rates from industry sources to determine the potential future warranty cost. However, there can be no assurance that future warranty or recall costs will not exceed historical amounts or that new technology products, which may include extended warranties, may not generate unexpected costs. If actual future warranty or recall costs exceed historical amounts, additional allowances may be required, which could have a material adverse impact on the Company’s results of operations and cash flow. Reserves for product warranty and recall costs are included in Other accrued liabilities and Other long-term liabilities on the Consolidated Balance Sheets . The changes in the reserves for product warranty and recall costs during the fiscal years ended August 31, 2017 , 2016 , and 2015 are summarized as follows (in millions): Year Ended August 31, 2017 2016 2015 Beginning balance $ 15.5 $ 9.6 $ 8.5 Warranty and recall costs 41.1 25.7 16.1 Payments and other deductions (33.3 ) (20.8 ) (15.0 ) Acquired warranty and recall liabilities — 1.0 — Ending balance $ 23.3 $ 15.5 $ 9.6 Trade Compliance Matters In the course of routine reviews of import and export activity, the Company determined that it misclassified and/or inaccurately valued certain international shipments of products. The Company is conducting a detailed review of this activity to determine the extent of any liabilities and the appropriate remedial measures. At this time, the Company is unable to determine the likelihood or amount of any loss associated with these shipments.

Special Charge

Special Charge	12 Months Ended
	Aug. 31, 2017
Restructuring and Related Activities [Abstract]
Special Charge	Special Charge During the year ended August 31, 2017 , the Company recognized pre-tax special charges of $11.3 million , which consisted primarily of severance and employee-related benefit costs for the elimination of certain operations and positions following a realignment of the Company’s operating structure, including positions within various selling, distribution, and administrative (“SD&A”) departments. During fiscal 2016 , the Company recognized pre-tax special charges of $15.0 million . These charges related primarily to the Company's continued efforts to integrate recent acquisitions and to streamline the organization by realigning certain responsibilities primarily within various SD&A departments, as well as the consolidation of certain production activities. The Company expects that these actions to streamline its business activities, in addition to those taken in previous fiscal years, will allow it to reduce spending in certain areas while permitting continued investment in future growth initiatives, such as new products, expanded market presence, and technology and innovation. The details of the special charges during the years ended August 31, 2017 and 2016 are summarized as follows (in millions): Year Ended August 31, 2017 2016 Severance and employee-related costs $ 11.2 $ 9.9 Lease termination and other costs 0.1 5.1 Total special charges $ 11.3 $ 15.0 As of August 31, 2017 , remaining reserves were $12.6 million and are included in Accrued compensation and Other long-term liabilities in the Consolidated Balance Sheets . The changes in the reserves related to these programs during the year ended August 31, 2017 are summarized as follows (in millions): Fiscal 2017 Actions Fiscal 2016 Actions Fiscal 2015 Actions Total Balance as of August 31, 2016 $ — $ 6.4 $ 0.2 $ 6.6 Severance costs 12.2 (1.0 ) — $ 11.2 Lease termination costs — 1.1 — $ 1.1 Payments made during the period (1.0 ) (5.1 ) (0.2 ) $ (6.3 ) Balance as of August 31, 2017 $ 11.2 $ 1.4 $ — $ 12.6

Income Taxes

Income Taxes	12 Months Ended
	Aug. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company accounts for income taxes using the asset and liability approach as prescribed by ASC Topic 740, Income Taxes (“ASC 740”). This approach requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements or tax returns. Using the enacted tax rates in effect for the year in which the differences are expected to reverse, deferred tax liabilities and assets are determined based on the differences between the financial reporting and the tax basis of an asset or liability. The provision for income taxes consists of the following components (in millions): Year Ended August 31, 2017 2016 2015 Provision for current federal taxes $ 151.2 $ 139.6 $ 101.5 Provision for current state taxes 20.4 17.6 13.1 Provision for current foreign taxes 7.0 5.1 4.3 (Benefit) provision for deferred taxes (7.7 ) (8.5 ) 2.6 Total provision for income taxes $ 170.9 $ 153.8 $ 121.5 A reconciliation of the provision at the federal statutory rate to the total provision for income taxes is as follows (in millions): Year Ended August 31, 2017 2016 2015 Federal income tax computed at statutory rate $ 172.4 $ 155.6 $ 120.3 State income tax, net of federal income tax benefit 12.2 11.0 8.6 Foreign permanent differences and rate differential (1.6 ) (2.0 ) (1.4 ) Other, net (12.1 ) (10.8 ) (6.0 ) Total provision for income taxes $ 170.9 $ 153.8 $ 121.5 Components of the net deferred income tax liabilities at August 31, 2017 and 2016 include (in millions): August 31, 2017 2016 Deferred income tax liabilities: Depreciation $ (20.0 ) $ (22.5 ) Goodwill and intangibles (194.9 ) (161.6 ) Other liabilities (4.0 ) (3.7 ) Total deferred income tax liabilities (218.9 ) (187.8 ) Deferred income tax assets: Self-insurance 4.1 4.0 Pension 33.7 41.7 Deferred compensation 32.9 28.9 Net operating losses 13.7 14.3 Other accruals not yet deductible 33.3 33.5 Other assets 10.6 12.3 Total deferred income tax assets 128.3 134.7 Valuation allowance (14.2 ) (16.4 ) Net deferred income tax liabilities $ (104.8 ) $ (69.5 ) The Company currently intends to indefinitely reinvest all undistributed earnings of and original investments in foreign subsidiaries unless it is determined future repatriation would give rise to little or no net tax costs. Undistributed earnings amounted to $96.7 million at August 31, 2017 ; however, this amount could fluctuate due to changes in business, economic, or other conditions. Undistributed earnings is the most significant component of the basis difference, which is indefinitely reinvested. If these undistributed earnings were distributed to the U.S. in the form of dividends or otherwise or if the shares of the relevant foreign subsidiaries were sold or otherwise transferred, the Company would be subject to additional U.S. income taxes (subject to an adjustment for foreign tax credits) and foreign withholding taxes. Determination of the amount of unrecognized deferred income tax liabilities related to these earnings or investments is not practicable. At August 31, 2017 , the Company had state tax credit carryforwards of approximately $0.9 million , which will expire beginning in 2018 . At August 31, 2017 , the Company had federal net operating loss carryforwards of $23.3 million that expire beginning in 2030 , state net operating loss carryforwards of $9.9 million that begin expiring in 2018 , and foreign net operating loss carryforwards of $21.2 million that begin expiring in 2018 . The gross amount of unrecognized tax benefits as of August 31, 2017 and 2016 totaled $6.0 million and $5.2 million , respectively, which includes $4.4 million and $3.9 million , respectively, of net unrecognized tax benefits that, if recognized, would affect the annual effective tax rate. The Company recognizes potential interest and penalties related to unrecognized tax benefits as a component of income tax expense; such accrued interest and penalties are not material. With few exceptions, the Company is no longer subject to United States federal, state, and local income tax examinations for years ended before 2013 or for foreign income tax examinations before 2011 . The Company does not anticipate unrecognized tax benefits will significantly increase or decrease within the next twelve months. A reconciliation of the change in the unrecognized income tax benefit (reported in Other long-term liabilities on the Consolidated Balance Sheets ) for the years ended August 31, 2017 and 2016 is as follows (in millions): Year Ended August 31, 2017 2016 Unrecognized tax benefits balance at beginning of year $ 5.2 $ 4.5 Additions based on tax positions related to the current year 1.2 1.0 Additions for tax positions of prior years 0.4 0.5 Reductions due to lapse of statute of limitations (0.8 ) (0.8 ) Unrecognized tax benefits balance at end of year $ 6.0 $ 5.2 Total accrued interest was $1.0 million and $0.9 million as of August 31, 2017 and 2016 , respectively. There were no accruals related to income tax penalties during fiscal 2017 . Interest, net of tax benefits, and penalties are included in income tax expense. The classification of interest and penalties did not change during the current fiscal year.

Supplemental Disaggregated Info

Supplemental Disaggregated Information	12 Months Ended
	Aug. 31, 2017
Segment Reporting [Abstract]
Supplemental Disaggregated Information	Supplemental Disaggregated Information The Company has one reportable segment. Sales of lighting and building management solutions, excluding services, accounted for approximately 99% of total consolidated net sales in fiscal 2017 , 2016 , and 2015 . The geographic distribution of the Company’s net sales, operating profit, income before provision for income taxes, and long-lived assets is summarized in the following table for the years ended August 31 (in millions): Year Ended August 31, 2017 2016 2015 Net sales (1) : Domestic (2) $ 3,123.1 $ 2,928.3 $ 2,450.1 International 382.0 363.0 256.6 Total $ 3,505.1 $ 3,291.3 $ 2,706.7 Operating profit: Domestic (2) $ 497.5 $ 457.6 $ 364.0 International 21.3 17.6 12.3 Total $ 518.8 $ 475.2 $ 376.3 Income before provision for income taxes: Domestic (2) $ 478.5 $ 430.8 $ 329.4 International 14.1 13.8 14.2 Total $ 492.6 $ 444.6 $ 343.6 Long-lived assets (3) : Domestic (2) $ 252.8 $ 254.5 $ 179.6 International 51.5 41.4 25.6 Total $ 304.3 $ 295.9 $ 205.2 _______________________________________ (1) Net sales are attributed to each country based on the selling location. (2) Domestic amounts include amounts for U.S. based operations. (3) Long-lived assets include net property, plant, and equipment, long-term deferred income tax assets, and other long-term assets as reflected in the Consolidated Balance Sheets .

Supplemental Guarantor Condense

Supplemental Guarantor Condensed Consolidating Financial Statements	12 Months Ended
	Aug. 31, 2017
Supplemental Guarantor Condensed Consolidating Financial Statements [Abstract]
Supplemental Guarantor Condensed Consolidating Financial Statements	Supplemental Guarantor Condensed Consolidating Financial Statements In December 2009, ABL, the 100% owned and principal operating subsidiary of Acuity Brands, refinanced the then current outstanding debt through the issuance of the Notes. See Debt and Lines of Credit footnote for further information. In accordance with the registration rights agreement by and between ABL and the guarantors to the Notes and the initial purchasers of the Notes, ABL and the guarantors to the Notes filed a registration statement with the SEC for an offer to exchange the Notes for an issue of SEC-registered notes with identical terms. Due to the filing of the registration statement and offer to exchange, the Company determined the need for compliance with Rule 3-10 of SEC Regulation S-X (“Rule 3-10”). In lieu of providing separate audited financial statements for ABL and ABL IP Holding, the Company has included the accompanying Condensed Consolidating Financial Statements in accordance with Rule 3-10(d) of SEC Regulation S-X since the Notes are fully and unconditionally guaranteed by Acuity Brands and ABL IP Holding. The column marked “Parent” represents the financial condition, results of operations, and cash flows of Acuity Brands. The column marked “Subsidiary Issuer” represents the financial condition, results of operations, and cash flows of ABL. The column entitled “Subsidiary Guarantor” represents the financial condition, results of operations, and cash flows of ABL IP Holding. Lastly, the column listed as “Non-Guarantors” includes the financial condition, results of operations, and cash flows of the non-guarantor direct and indirect subsidiaries of Acuity Brands, which consist primarily of foreign subsidiaries. Consolidating adjustments were necessary in order to arrive at consolidated amounts. In addition, the equity method of accounting was used to calculate investments in subsidiaries. Accordingly, this basis of presentation is not intended to present the Company's financial condition, results of operations, or cash flows for any purpose other than to comply with the specific requirements for parent-subsidiary guarantor reporting. CONDENSED CONSOLIDATING BALANCE SHEETS (In millions) At August 31, 2017 Parent Subsidiary Issuer Subsidiary Guarantor Non- Guarantors Consolidating Adjustments Consolidated ASSETS Current assets: Cash and cash equivalents $ 237.7 $ — $ — $ 73.4 $ — $ 311.1 Accounts receivable, net — 494.6 — 78.7 — 573.3 Inventories — 305.5 — 23.1 — 328.6 Other current assets 1.6 15.8 — 15.2 — 32.6 Total current assets 239.3 815.9 — 190.4 — 1,245.6 Property, plant, and equipment, net 0.2 228.3 — 59.2 — 287.7 Goodwill — 677.7 2.7 220.5 — 900.9 Intangible assets, net — 235.5 109.8 103.5 — 448.8 Deferred income taxes 51.6 — — 8.0 (56.2 ) 3.4 Other long-term assets 1.5 10.9 — 0.8 — 13.2 Investments in and amounts due from affiliates 1,500.3 330.4 234.2 — (2,064.9 ) — Total assets $ 1,792.9 $ 2,298.7 $ 346.7 $ 582.4 $ (2,121.1 ) $ 2,899.6 LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities: Accounts payable $ 0.9 $ 366.4 $ — $ 27.8 $ — $ 395.1 Current maturities of long-term debt — — — 0.4 — 0.4 Accrued liabilities 27.6 138.9 — 38.9 — 205.4 Total current liabilities 28.5 505.3 — 67.1 — 600.9 Long-term debt — 353.1 — 3.4 — 356.5 Deferred income taxes — 134.6 — 29.8 (56.2 ) 108.2 Other long-term liabilities 98.7 49.3 — 20.4 — 168.4 Amounts due to affiliates — — — 128.8 (128.8 ) — Total stockholders’ equity 1,665.7 1,256.4 346.7 332.9 (1,936.1 ) 1,665.6 Total liabilities and stockholders’ equity $ 1,792.9 $ 2,298.7 $ 346.7 $ 582.4 $ (2,121.1 ) $ 2,899.6 CONDENSED CONSOLIDATING BALANCE SHEETS (In millions) At August 31, 2016 Parent Subsidiary Issuer Subsidiary Guarantor Non- Guarantors Consolidating Adjustments Consolidated ASSETS Current assets: Cash and cash equivalents $ 368.2 $ — $ — $ 45.0 $ — $ 413.2 Accounts receivable, net — 503.0 — 69.8 — 572.8 Inventories — 274.7 — 20.5 — 295.2 Other current assets 2.5 14.3 — 24.9 — 41.7 Total current assets 370.7 792.0 — 160.2 — 1,322.9 Property, plant, and equipment, net 0.3 217.8 — 49.7 — 267.8 Goodwill — 735.8 2.7 209.3 — 947.8 Intangible assets, net — 168.1 113.4 99.9 — 381.4 Deferred income taxes 47.5 — — 6.5 (48.9 ) 5.1 Other long-term assets 1.4 20.4 — 1.2 — 23.0 Investments in and amounts due from affiliates 1,347.6 299.6 200.5 — (1,847.7 ) — Total assets $ 1,767.5 $ 2,233.7 $ 316.6 $ 526.8 $ (1,896.6 ) $ 2,948.0 LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities: Accounts payable $ 1.2 $ 371.3 $ — $ 28.5 $ — $ 401.0 Current maturities of long-term debt — — — 0.2 — 0.2 Other accrued liabilities 14.5 215.4 — 41.4 — 271.3 Total current liabilities 15.7 586.7 — 70.1 — 672.5 Long-term debt — 352.8 — 2.2 — 355.0 Deferred income taxes — 95.5 — 28.0 (48.9 ) 74.6 Other long-term liabilities 92.0 64.8 — 29.3 — 186.1 Amounts due to affiliates — — — 96.9 (96.9 ) — Total stockholders’ equity 1,659.8 1,133.9 316.6 300.3 (1,750.8 ) 1,659.8 Total liabilities and stockholders’ equity $ 1,767.5 $ 2,233.7 $ 316.6 $ 526.8 $ (1,896.6 ) $ 2,948.0 CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (In millions) Year Ended August 31, 2017 Parent Subsidiary Issuer Subsidiary Guarantor Non- Guarantors Consolidating Adjustments Consolidated Net sales: External sales $ — $ 3,105.2 $ — $ 399.9 $ — $ 3,505.1 Intercompany sales — — 49.4 179.2 (228.6 ) — Total sales — 3,105.2 49.4 579.1 (228.6 ) 3,505.1 Cost of products sold — 1,764.5 — 432.8 (173.4 ) 2,023.9 Gross profit — 1,340.7 49.4 146.3 (55.2 ) 1,481.2 Selling, distribution, and administrative expenses 45.0 824.8 3.6 132.8 (55.1 ) 951.1 Intercompany charges (56.9 ) 47.7 — 9.2 — — Special charge — 11.3 — — — 11.3 Operating profit 11.9 456.9 45.8 4.3 (0.1 ) 518.8 Interest expense, net 11.0 16.1 — 5.4 — 32.5 Equity earnings in subsidiaries (320.9 ) (7.7 ) — 0.2 328.4 — Miscellaneous (income) expense, net — (8.0 ) — 1.7 — (6.3 ) Income (loss) before provision for income taxes 321.8 456.5 45.8 (3.0 ) (328.5 ) 492.6 Provision (benefit) for income taxes 0.1 158.0 15.7 (2.9 ) — 170.9 Net income (loss) 321.7 298.5 30.1 (0.1 ) (328.5 ) 321.7 Other comprehensive income (loss) items: Foreign currency translation adjustments 19.0 19.0 — — (19.0 ) 19.0 Defined benefit pension plans, net 20.7 11.8 — 7.5 (19.3 ) 20.7 Other comprehensive income items after provision for income taxes 39.7 30.8 — 7.5 (38.3 ) 39.7 Comprehensive income $ 361.4 $ 329.3 $ 30.1 $ 7.4 $ (366.8 ) $ 361.4 CONDENSED CONSOL IDATING STATEMENTS OF COMPREHENSIVE INCOME (In millions) Year Ended August 31, 2016 Parent Subsidiary Issuer Subsidiary Guarantor Non- Guarantors Consolidating Adjustments Consolidated Net sales: External sales $ — $ 2,919.7 $ — $ 371.6 $ — $ 3,291.3 Intercompany sales — — 47.4 131.2 (178.6 ) — Total sales — 2,919.7 47.4 502.8 (178.6 ) 3,291.3 Cost of products sold — 1,602.2 — 379.3 (126.4 ) 1,855.1 Gross profit — 1,317.5 47.4 123.5 (52.2 ) 1,436.2 Selling, distribution, and administrative expenses 47.2 834.6 3.8 112.6 (52.2 ) 946.0 Intercompany charges (59.5 ) 50.4 — 9.1 — — Special charge — 15.0 — — — 15.0 Operating profit 12.3 417.5 43.6 1.8 — 475.2 Interest expense, net 10.5 16.1 — 5.6 — 32.2 Equity earnings in subsidiaries (289.2 ) (3.2 ) — 0.2 292.2 — Miscellaneous income, net — — — (1.6 ) — (1.6 ) Income (loss) before provision for income taxes 291.0 404.6 43.6 (2.4 ) (292.2 ) 444.6 Provision for income taxes 0.2 137.7 15.6 0.3 — 153.8 Net income (loss) 290.8 266.9 28.0 (2.7 ) (292.2 ) 290.8 Other comprehensive income (loss) items: Foreign currency translation adjustments (5.6 ) (5.6 ) — — 5.6 (5.6 ) Defined benefit pension plans, net (23.4 ) (11.4 ) — (9.5 ) 20.9 (23.4 ) Other comprehensive loss items after provision for income taxes (29.0 ) (17.0 ) — (9.5 ) 26.5 (29.0 ) Comprehensive income (loss) $ 261.8 $ 249.9 $ 28.0 $ (12.2 ) $ (265.7 ) $ 261.8 CONDENSED CONSOL IDATING STATEMENTS OF COMPREHENSIVE INCOME (In millions) Year Ended August 31, 2015 Parent Subsidiary Issuer Subsidiary Guarantor Non- Guarantors Consolidating Adjustments Consolidated Net sales: External sales $ — $ 2,446.9 $ — $ 259.8 $ — $ 2,706.7 Intercompany sales — — 41.2 105.5 (146.7 ) — Total sales — 2,446.9 41.2 365.3 (146.7 ) 2,706.7 Cost of products sold — 1,388.0 — 276.5 (103.4 ) 1,561.1 Gross profit — 1,058.9 41.2 88.8 (43.3 ) 1,145.6 Selling, distribution, and administrative expenses 34.0 684.4 4.0 77.8 (43.3 ) 756.9 Intercompany charges (45.4 ) 39.7 — 5.7 — — Special charge — 12.4 — — — 12.4 Operating profit 11.4 322.4 37.2 5.3 — 376.3 Interest expense (income), net 9.9 21.8 — (0.2 ) — 31.5 Equity earnings in subsidiaries (221.2 ) (5.2 ) — — 226.4 — Miscellaneous income, net — 2.8 — (1.6 ) — 1.2 Income before provision for income taxes 222.7 303.0 37.2 7.1 (226.4 ) 343.6 Provision for income taxes 0.6 103.5 14.9 2.5 — 121.5 Net income 222.1 199.5 22.3 4.6 (226.4 ) 222.1 Other comprehensive income (loss) items: Foreign currency translation adjustments (24.0 ) (24.0 ) — — 24.0 (24.0 ) Defined benefit pension plans, net (14.5 ) 6.3 — 0.5 (6.8 ) (14.5 ) Other comprehensive (loss) income items after provision for income taxes (38.5 ) (17.7 ) — 0.5 17.2 (38.5 ) Comprehensive income $ 183.6 $ 181.8 $ 22.3 $ 5.1 $ (209.2 ) $ 183.6 CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS (In millions) Year Ended August 31, 2017 Parent Subsidiary Issuer Subsidiary Guarantor Non- Guarantors Consolidating Adjustments Consolidated Net cash provided by operating activities $ 241.9 $ 41.4 $ — $ 32.9 $ — $ 316.2 Cash flows from investing activities: Purchases of property, plant, and equipment — (53.1 ) — (14.2 ) — (67.3 ) Proceeds from sale of property, plant, and equipment — 0.2 — 5.3 — 5.5 Proceeds from sale of investment in unconsolidated affiliate — 13.2 — — — 13.2 Other investing activities — (0.2 ) — — — (0.2 ) Net cash used for investing activities — (39.9 ) — (8.9 ) — (48.8 ) Cash flow from financing activities: Issuance of long-term debt — — — 1.0 — 1.0 Proceeds from stock option exercises and other 3.0 — — — — 3.0 Repurchases of common stock (357.9 ) — — — — (357.9 ) Excess tax benefits from share-based payments 5.2 — — — — 5.2 Dividends paid (22.7 ) — — — — (22.7 ) Net cash (used for) provided by financing activities (372.4 ) — — 1.0 — (371.4 ) Effect of exchange rate changes on cash — (1.5 ) — 3.4 — 1.9 Net change in cash and cash equivalents (130.5 ) — — 28.4 — (102.1 ) Cash and cash equivalents at beginning of year 368.2 — — 45.0 — 413.2 Cash and cash equivalents at end of year $ 237.7 $ — $ — $ 73.4 $ — $ 311.1 CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS (In millions) Year Ended August 31, 2016 Parent Subsidiary Issuer Subsidiary Guarantor Non- Guarantors Consolidating Adjustments Consolidated Net cash provided by operating activities $ 277.0 $ 54.8 $ — $ 13.9 $ — $ 345.7 Cash flows from investing activities: Purchases of property, plant, and equipment — (67.1 ) — (16.6 ) — (83.7 ) Proceeds from sale of property, plant, and equipment — 0.2 — 2.0 — 2.2 Investments in subsidiaries (405.6 ) — — — 405.6 — Acquisitions of businesses and intangible assets — (393.9 ) — (229.3 ) — (623.2 ) Net cash used for investing activities (405.6 ) (460.8 ) — (243.9 ) 405.6 (704.7 ) Cash flows from financing activities: Issuance of long-term debt — — — 2.5 — 2.5 Proceeds from stock option exercises and other 14.2 — — — — 14.2 Excess tax benefits from share-based payments 25.6 — — — — 25.6 Intercompany capital — 405.6 — — (405.6 ) — Dividends paid (22.9 ) — — — — (22.9 ) Net cash provided by financing activities 16.9 405.6 — 2.5 (405.6 ) 19.4 Effect of exchange rate changes on cash — 0.4 — (4.4 ) — (4.0 ) Net change in cash and cash equivalents (111.7 ) — — (231.9 ) — (343.6 ) Cash and cash equivalents at beginning of year 479.9 — — 276.9 — 756.8 Cash and cash equivalents at end of year $ 368.2 $ — $ — $ 45.0 $ — $ 413.2 CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS (In millions) Year Ended August 31, 2015 Parent Subsidiary Issuer Subsidiary Guarantor Non- Guarantors Consolidating Adjustments Consolidated Net cash provided by operating activities $ 212.1 $ 55.2 $ — $ 21.6 $ — $ 288.9 Cash flows from investing activities: Purchases of property, plant, and equipment — (41.9 ) — (14.6 ) — (56.5 ) Proceeds from sale of property, plant, and equipment — 1.3 — — — 1.3 Investments in subsidiaries (254.7 ) (245.2 ) — — 499.9 — Acquisitions of businesses and intangible assets — (14.6 ) — — — (14.6 ) Other investing activities — (2.6 ) — — — (2.6 ) Net cash used for investing activities (254.7 ) (303.0 ) — (14.6 ) 499.9 (72.4 ) Cash flows from financing activities: Proceeds from stock option exercises and other 11.6 — — — — 11.6 Excess tax benefits from share-based payments 17.6 — — — — 17.6 Intercompany capital — 245.2 — 254.7 (499.9 ) — Dividends paid (22.7 ) — — — — (22.7 ) Other financing activities — — — (10.4 ) — (10.4 ) Net cash provided by (used for) financing activities 6.5 245.2 — 244.3 (499.9 ) (3.9 ) Effect of exchange rate changes on cash — (0.5 ) — (7.8 ) — (8.3 ) Net change in cash and cash equivalents (36.1 ) (3.1 ) — 243.5 — 204.3 Cash and cash equivalents at beginning of year 516.0 3.1 — 33.4 — 552.5 Cash and cash equivalents at end of year $ 479.9 $ — $ — $ 276.9 $ — $ 756.8

Quarterly Financial Data (Unaud

Quarterly Financial Data (Unaudited)	12 Months Ended
	Aug. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Data (Unaudited)	Quarterly Financial Data (Unaudited) Fiscal Year 2017 (In millions) 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Net sales $ 851.2 $ 804.7 $ 891.6 $ 957.6 Gross profit $ 359.6 $ 335.8 $ 378.9 $ 406.9 Net income $ 81.7 $ 67.3 $ 82.2 $ 90.5 Basic earnings per share $ 1.87 $ 1.54 $ 1.91 $ 2.16 Diluted earnings per share $ 1.86 $ 1.53 $ 1.90 $ 2.15 Fiscal Year 2016 (In millions) 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Net sales $ 736.6 $ 777.8 $ 851.5 $ 925.5 Gross profit $ 319.4 $ 336.9 $ 377.9 $ 402.1 Net income $ 68.4 $ 65.5 $ 74.0 $ 82.9 Basic earnings per share $ 1.58 $ 1.50 $ 1.70 $ 1.90 Diluted earnings per share $ 1.57 $ 1.49 $ 1.69 $ 1.89 Certain amounts in the tables above have been rounded. Accordingly, the sum of the quarters may not be an exact match to the full year amounts.

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Aug. 31, 2017
Valuation and Qualifying Accounts [Abstract]
Schedule II - Valuation and Qualifying Accounts	Schedule II Acuity Brands, Inc. Valuation and Qualifying Accounts For the Years Ended August 31, 2017 , 2016 , and 2015 (In millions) Balance at Additions and Reductions Charged to Beginning of Year Costs and Expenses Other Accounts Deductions Balance at End of Year Year Ended August 31, 2017 Reserve for doubtful accounts $ 1.7 0.3 0.1 0.2 $ 1.9 Reserve for estimated product returns, net $ 10.9 84.7 — 82.0 $ 13.6 Reserve for estimated cash discounts $ 4.7 29.0 — 29.6 $ 4.1 Reserve for estimated other deductions $ 1.7 20.5 — 18.6 $ 3.6 Deferred tax asset valuation allowance $ 16.4 1.5 (0.6 ) 3.1 $ 14.2 Year Ended August 31, 2016 Reserve for doubtful accounts $ 1.3 0.3 0.4 0.3 $ 1.7 Reserve for estimated product returns, net $ 6.2 62.6 0.9 58.8 $ 10.9 Reserve for estimated cash discounts $ 3.0 32.0 0.9 31.2 $ 4.7 Reserve for estimated other deductions $ 1.3 11.9 — 11.5 $ 1.7 Deferred tax asset valuation allowance $ 15.0 (0.2 ) 1.6 — $ 16.4 Year Ended August 31, 2015 Reserve for doubtful accounts $ 1.9 0.1 — 0.7 $ 1.3 Reserve for estimated product returns, net $ 4.3 44.7 — 42.8 $ 6.2 Reserve for estimated cash discounts $ 2.7 21.7 — 21.4 $ 3.0 Reserve for estimated other deductions $ 1.3 9.1 — 9.1 $ 1.3 Deferred tax asset valuation allowance $ 13.6 (0.4 ) 1.8 — $ 15.0

Significant Accounting Polici24

Significant Accounting Policies (Policies)	12 Months Ended
	Aug. 31, 2017
Accounting Policies [Abstract]
Principles of Consolidation	The Consolidated Financial Statements include the accounts of Acuity Brands and its wholly-owned subsidiaries after elimination of intercompany transactions and accounts.
Revenue Recognition	The Company records revenue when the following criteria are met: persuasive evidence of an arrangement exists, delivery has occurred, the Company’s price to the customer is fixed and determinable, and collectability is reasonably assured. Delivery is not considered to have occurred until the customer assumes the risks and rewards of ownership. Customers take delivery at the time of shipment for terms designated free on board shipping point. For sales designated free on board destination, customers take delivery when the product is received at the customer’s designated site. Provisions for certain rebates, sales incentives, product returns, and discounts to customers are recorded in the same period the related revenue is recorded. The Company also maintains one-time or ongoing marketing and trade-promotion programs with certain customers that require the Company to estimate and accrue the expected costs of such programs. These arrangements include cooperative marketing programs, merchandising of the Company’s products, introductory marketing funds for new products, and other trade-promotion activities conducted by the customer. Costs associated with these programs are reflected within the Company’s Consolidated Statements of Comprehensive Income in accordance with Accounting Standards Codification (“ASC”) Topic 605, Revenue Recognition (“ASC 605”), which in most instances requires such costs be recorded as a reduction of revenue. The liabilities associated with the programs totaled $38.1 million and $41.0 million as of August 31, 2017 and 2016 , respectively, and are reflected within Other accrued liabilities on the Consolidated Balance Sheets . The Company's standard terms and conditions of sale allow returns of certain products within four months of the date of shipment. The Company also provides for limited product return rights to certain distributors and other customers, primarily for slow moving or damaged items subject to certain defined criteria. The limited product return rights generally allow customers to return resalable products purchased within a specified time period and subject to certain limitations, including, at times, when accompanied by a replacement order of equal or greater value. At the time revenue is recognized, the Company records a provision for the estimated amount of future returns primarily based on historical experience, specific notification of pending returns, or contractual terms with the respective customers. Although historical product returns generally have been within expectations, there can be no assurance that future product returns will not exceed historical amounts. A significant increase in product returns could have a material adverse impact on the Company's operating results in future periods. Revenue is earned on services and the sale of products. Revenue is recognized for the sale of products when the above criteria are met and for services rendered in the period of performance.
Revenue Recognition for Arrangements with Multiple Deliverables	A small portion ( less than 4% ) of the Company's revenues are derived from the combination of any or all of: (i) the sale and license of its products, (ii) fees associated with training, installation, and technical support services, (iii) monitoring and lighting control services, and (iv) providing services related to data analytics. Certain agreements for integrated lighting solutions represent multiple-element arrangements that include tangible products as well as services that are essential to the functionality of the solution. These services primarily relate to installation, monitoring, and lighting controls services. All of these elements are reviewed and analyzed to determine separability in relation to the delivered elements and appropriate pricing treatment based on (a) vendor-specific objective evidence, (b) third-party evidence, or (c) management estimates. If deemed separate units of accounting, the revenue and associated cost of sales related to the delivered elements are recognized at the time of delivery, while those related to the undelivered elements are recognized appropriately based on the period of performance. If the separation criterion for the undelivered elements is not met because the undelivered elements are essential to the functionality of the lighting controls systems, all revenue and cost of sales attributable to the contract are deferred at the time of sale and are both generally recognized on a straight-line basis over the respective contract periods.
Use of Estimates	The preparation of financial statements and related disclosures in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expense during the reporting period. Actual results could differ from those estimates.
Cash and Cash Equivalents	Cash in excess of daily requirements is invested in time deposits and marketable securities and is included in the accompanying balance sheets at fair value. The Company considers time deposits and marketable securities with an original maturity of three months or less when purchased to be cash equivalents.
Accounts Receivable	The Company records accounts receivable at net realizable value. This value includes a reserve for doubtful accounts to reflect losses anticipated on accounts receivable balances. The allowance is based on historical write-offs, an analysis of past due accounts based on the contractual terms of the receivables, and the economic status of customers, if known. Management believes that the allowance is sufficient to cover uncollectible amounts; however, there can be no assurance that unanticipated future business conditions of customers will not have a negative impact on the Company’s results of operations.
Concentrations of Credit Risk	Concentrations of credit risk with respect to receivables, which are typically unsecured, are generally limited due to the wide variety of customers and markets using the Company’s lighting and building management solutions as well as their dispersion across many different geographic areas.
Reclassifications	Certain prior-period amounts have been reclassified to conform to the current year presentation. No material reclassifications occurred during the current period.
Subsequent Events	The Company has evaluated subsequent events for recognition and disclosure for occurrences and transactions after the date of the consolidated financial statements as of August 31, 2017 .
Inventories	Management reviews inventory quantities on hand and records a provision for excess or obsolete inventory primarily based on estimated future demand and current market conditions. A significant change in customer demand or market conditions could render certain inventory obsolete and could have a material adverse impact on the Company’s operating results in the period the change occurs. Inventories include materials, direct labor, in-bound freight, and related manufacturing overhead, are stated at the lower of cost (on a first-in, first-out or average cost basis) or market
Assets Held for Sale	In accordance with applicable U.S. GAAP, the Company classifies assets as held for sale upon the development of a plan for disposal and ceases the depreciation and amortization of the assets at that date.
Goodwill and Other Intangibles	Through multiple acquisitions, the Company acquired intangible assets consisting primarily of trademarks and trade names associated with specific products with finite lives, definite-lived distribution networks, patented technology, non-compete agreements, and customer relationships, which are amortized over their estimated useful lives. Indefinite-lived intangible assets consist of trade names that are expected to generate cash flows indefinitely. Significant estimates and assumptions were used to determine the initial fair value of these acquired intangible assets, including estimated future net sales, customer attrition rates, royalty rates, and discount rates. The current year increase in the gross carrying amounts for the acquired intangible assets and the decrease in goodwill were due primarily to the finalization of the purchase accounting allocation during the current fiscal year for Juno Lighting LLC (“Juno Lighting”) and DGLogik, Inc. (“DGLogik”) as well as foreign currency translation adjustments. Refer to the Acquisitions and Investments footnote for additional information regarding the purchase price allocations for these acquisitions. The Company recorded amortization expense of $28.0 million , $21.4 million , and $11.0 million related to intangible assets with finite lives during fiscal 2017 , 2016 , and 2015 , respectively. Amortization expense is generally recorded on a straight-line basis and is expected to be approximately $26.4 million in fiscal 2018 , $26.4 million in fiscal 2019 , $26.0 million in fiscal 2020 , $25.7 million in fiscal 2021 , and $22.3 million in fiscal 2022 . The Company tests goodwill and indefinite-lived intangible assets for impairment on an annual basis or more frequently as facts and circumstances change, as required by ASC Topic 350, Intangibles — Goodwill and Other (“ASC 350”). Additionally, the Company early adopted Accounting Standards Update (“ASU”), Simplifying the Test for Goodwill Impairment (“ASU 2017-04,”). Refer to the New Accounting Pronouncements footnote for more information regarding the adoption of this standard. The preliminary goodwill impairment step allows for an optional qualitative analysis to determine the likelihood of impairment. If the qualitative review results in a more likely than not probability of impairment, a quantitative analysis is required. The qualitative step may be bypassed entirely in favor of a quantitative test. The quantitative analysis identifies impairments by comparing the fair value of a reporting unit with its carrying value, including goodwill. The fair values can be determined based on a combination of valuation techniques including the expected present value of future cash flows, a market multiple approach, and a comparable transaction approach. If the fair value of a reporting unit exceeds its carrying value, goodwill is not considered impaired. Conversely, if the carrying value of a reporting unit exceeds its fair value, an impairment charge for the difference is recorded. In fiscal 2017 , a quantitative fair value analysis, based on discounted future cash flows, was used to determine the likelihood of goodwill impairment for the Company’s one reporting unit. During fiscal 2016 and 2015, a qualitative analysis was used to determine the likelihood of impairment. The analysis for goodwill did not result in an impairment charge during fiscal 2017 , 2016 , or 2015 . The impairment test for indefinite-lived trade names consists of comparing the fair value of an asset with its carrying value. If the carrying amount exceeds the estimated fair value, an impairment loss would be recorded in the amount of the excess. The Company estimates the fair value of indefinite-lived trade names using a fair value model based on discounted future cash flows. Significant assumptions, including estimated future net sales, royalty rates, and discount rates, are used in the determination of estimated fair value for indefinite-lived trade names.
Shipping and Handling Fees and Costs	The Company includes shipping and handling fees billed to customers in Net sales in the Consolidated Statements of Comprehensive Income . Shipping and handling costs associated with inbound freight and freight between manufacturing facilities and distribution centers are generally recorded in Cost of products sold in the Consolidated Statements of Comprehensive Income . Other shipping and handling costs are included in Selling, distribution, and administrative expenses in the Consolidated Statements of Comprehensive Income
Share-Based Payments	The Company recognizes compensation cost relating to share-based payment transactions in the financial statements based on the estimated fair value of the equity or liability instrument issued. The Company accounts for stock options, restricted shares, and share units representing certain deferrals into the Director Deferred Compensation Plan or the Supplemental Deferred Savings Plan (“SDSP”) (both of which are discussed further in the Share-based Payments footnote) based on the grant-date fair value estimated under the current provisions of ASC Topic 718, Compensation — Stock Compensation (“ASC 718”).
Depreciation	For financial reporting purposes, depreciation is determined principally on a straight-line basis using estimated useful lives of plant and equipment ( 10 to 40 years for buildings and related improvements and 3 to 15 years for machinery and equipment), while accelerated depreciation methods are used for income tax purposes. Leasehold improvements are amortized over the shorter of the life of the lease or the estimated useful life of the improvement.
Research and Development	Research and development (“R&D”) expense, which is expensed as incurred, consists of compensation, payroll taxes, employee benefits, materials, supplies, and other administrative costs. R&D does not include all new product development costs and is included in Selling, distribution, and administrative expenses in the Company’s Consolidated Statements of Comprehensive Income .
Advertising	Advertising costs are expensed as incurred and are included within Selling, distribution, and administrative expenses in the Company’s Consolidated Statements of Comprehensive Income .
Interest Expense, Net	Interest expense, net , is comprised primarily of interest expense on long-term debt, revolving credit facility borrowings, and loans collateralized by assets related to a company-owned life insurance program, partially offset by interest income on cash and cash equivalents.
Miscellaneous Expense (Income), Net	Miscellaneous expense (income), net , is composed primarily of gains or losses on foreign currency items and other non-operating items.
Income Taxes	The Company is taxed at statutory corporate rates after adjusting income reported for financial statement purposes for certain items that are treated differently for income tax purposes. Deferred income tax expenses or benefits result from changes during the year in cumulative temporary differences between the tax basis and book basis of assets and liabilities.
Foreign Currency Translation	The functional currency for the foreign operations of the Company is the local currency where the foreign operations are domiciled. The translation of foreign currencies into U.S. dollars is performed for balance sheet accounts using exchange rates in effect at the balance sheet dates and for revenue and expense accounts using a weighted average exchange rate each month during the year. The gains or losses resulting from the balance sheet translation are included in Foreign currency translation adjustments in the Consolidated Statements of Comprehensive Income and are excluded from net income.
Comprehensive Income	Comprehensive income represents a measure of all changes in equity that result from recognized transactions and other economic events other than transactions with owners in their capacity as owners. Other comprehensive income for the Company includes foreign currency translation and pension adjustments.
New Accounting Pronouncements	Accounting Standards Adopted in Fiscal 2017 In January 2017, the Financial Accounting Standards Board (“FASB”) issued ASU 2017-04. This guidance eliminates the requirement to determine the implied fair value of goodwill to measure an impairment of goodwill. Rather, goodwill impairment charges will be calculated as the amount by which a reporting unit's carrying amount exceeds its fair value. Adoption of the provisions in ASU 2017-04 is required for the Company for its annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company adopted ASU 2017-04 effective beginning in the current period. The provisions of ASU 2017-04 did not have a material effect on the Company's financial condition, results of operations, or cash flows. In July 2015, the FASB issued ASU No. 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments (“ASU 2015-16”), which simplifies the accounting for measurement-period adjustments to provisional amounts recognized in a business combination. ASU 2015-16 eliminates the requirement to retrospectively account for adjustments made to provisional amounts recorded in connection with a business combination and is effective for fiscal years (and interim reporting periods within those years) beginning after December 15, 2015. The Company adopted ASU 2015-16 this fiscal year and presented all adjustments to provisional amounts recorded in connection within a business combination in fiscal 2017 prospectively. In April 2015, the FASB issued ASU No. 2015-05, Customer's Accounting For Fees Paid In A Cloud Computing Arrangement (“ASU 2015-05”), which provides guidance for a customer's accounting for cloud computing costs. ASU 2015-05 is effective for fiscal years (and interim reporting periods within those years) beginning after December 15, 2015. The Company adopted ASU 2015-05 during fiscal 2017 . The provisions of ASU 2015-05 did not have a material effect on the Company's financial condition, results of operations, or cash flows. Accounting Standards Yet to Be Adopted In March 2017, the FASB issued ASU No. 2017-07, Compensation — Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (“ASU 2017-07”), which will change the presentation of net periodic benefit cost related to employer sponsored defined benefit plans and other postretirement benefits. Service cost will be included within the same income statement line item as other compensation costs arising from services rendered during the period, while other components of net periodic benefit pension cost will be presented separately outside of operating income. Additionally, only service costs may be capitalized in assets. ASU 2017-07 is effective for fiscal years (and interim reporting periods within those years) beginning after December 15, 2017. The provisions of ASU 2017-07 are not expected to have a material effect on the Company's financial condition, results of operations, or cash flows. In January 2017, the FASB issued ASU No. 2017-01, Clarifying the Definition of a Business (“ASU 2017-01”), which requires an evaluation of whether substantially all of the fair value of assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets. If so, the transaction does not qualify as a business. The guidance also requires an acquired business to include at least one substantive process and narrows the definition of outputs. The Company is required to apply this guidance to annual periods beginning after December 15, 2017, including interim periods within those periods. The Company is currently evaluating the impact of the provisions of ASU 2017-01 and intends to implement the standard as required in fiscal 2019. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (“ASU 2016-15”), which is intended to reduce the diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows including debt prepayment and extinguishment costs, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, and proceeds from the settlement of corporate-owned life insurance. ASU 2016-15 is effective for fiscal years (and interim reporting periods within those years) beginning after December 15, 2017. The Company intends to implement the standard as required in fiscal 2019, and the provisions of ASU 2016-15 are not expected to have a material impact on the Company's financial statement disclosures. In March 2016, the FASB issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting , (“ASU 2016-09”), which will change certain aspects of accounting for share-based payments to employees. ASU 2016-09 is effective for fiscal years (and interim reporting periods within those years) beginning after December 15, 2016. The standard requires that all excess tax benefits and deficiencies currently recorded as additional paid-in capital be prospectively recorded in income tax expense. As such, implementation of this standard could create volatility in the Company's effective income tax rate on a quarter by quarter basis. The volatility in the effective income tax rate is due primarily to fluctuations in the Company's stock price and the timing of stock option exercises and vesting of restricted share grants. The standard also requires excess tax benefits to be presented as an operating activity on the statement of cash flows rather than as a financing activity and taxes paid for employee withholdings to be presented as a financing activity. The Company will implement the standard as required in fiscal 2018. Excess tax benefits will be recorded within income tax expense on a prospective basis as required by the standard; however, the Company will elect to present changes to the statement of cash flows on a retrospective basis as allowed by the update in order to maintain comparability between fiscal years. In February 2016, the FASB issued ASU No. 2016-02, Leases (“ASU 2016-02”), which requires lessees to include most leases on the balance sheet. ASU 2016-02 is effective for fiscal years (and interim reporting periods within those years) beginning after December 15, 2018. The Company is currently evaluating the impact of the provisions of ASU 2016-02 and intends to implement the standard as required in fiscal 2020. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”), which will replace most existing revenue recognition guidance in U.S. GAAP. ASU 2014-09 outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. The standard also requires additional disclosures about the nature, timing, and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments. ASU 2014-09 permits two transition methods: the full retrospective method and the modified retrospective method. Under the full retrospective method, the standard would be applied to each prior reporting period presented with the cumulative effect of applying the standard recognized at the earliest period shown. Under the modified retrospective method, the cumulative effect of applying the standard would be recognized at the date of initial application. In March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers: Principal versus Agent Considerations (Reporting Revenue Gross versus Net) , which clarifies the guidance in ASU 2014-09 and has the same effective date as the original standard. During the three months ended July 1, 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers: Identifying Performance Obligations and Licensing; ASU 2016-11, Rescission of SEC Guidance Because of Accounting Standards Updates 2014-09 and 2014-16 Pursuant to Staff Announcements at the March 3, 2016 EITF Meeting; and ASU 2016-12, Revenue from Contracts with Customers: Narrow-Scope Improvements and Practical Expedients. These amendments are intended to improve and clarify the implementation guidance of ASU 2014-09 and have the same effective date as the original standard. The Company has an implementation team tasked with identifying potential differences that will result from applying the new revenue recognition standard to the Company's contracts with its customers. The implementation team reports the findings and progress of the project to management on a frequent basis and to the Audit Committee of the Board of Directors (the “Board”) on a quarterly basis. The implementation team has completed its initial phase of contract reviews and continues to evaluate the results of those reviews with respect to potential changes from adopting the new standard on the Company's consolidated financial statements. Management anticipates the most significant changes will relate to additional deferral of revenue recognition for certain services provided and the gross presentation of right of return assets and refund liabilities for sales with a right of return. Based on the current portfolio of the Company's revenue generating activities, these changes are not expected to have a material impact on the Company's consolidated financial condition, results of operations, or cash flows. Additionally, the implementation team is in the process of identifying appropriate changes to the Company's business processes, systems, and controls to support recognition and disclosure under the new standard. Based on the implementation team's current findings and the overall expected immaterial impact of adoption, the implementation team is currently evaluating which adoption method would provide the most meaningful information to the Company's stakeholders. The Company will adopt the requirements of the new standard no later than the effective date of September 1, 2018. All other newly issued accounting pronouncements not yet effective have been deemed either immaterial or not applicable.

Significant Accounting Polici25

Significant Accounting Policies (Tables)	12 Months Ended
	Aug. 31, 2017
Accounting Policies [Abstract]
Schedule of Inventory	Inventories include materials, direct labor, in-bound freight, and related manufacturing overhead, are stated at the lower of cost (on a first-in, first-out or average cost basis) or market, and consist of the following (in millions): August 31, 2017 2016 Raw materials, supplies, and work in process (1) $ 176.5 $ 170.3 Finished goods 180.8 145.3 Inventories excluding reserves 357.3 315.6 Less: Reserves (28.7 ) (20.4 ) Total inventories $ 328.6 $ 295.2 _______________________________________ (1) Due to the immaterial amount of estimated work in process and the short lead times for the conversion of raw materials to finished goods, the Company does not believe the segregation of raw materials and work in process is meaningful information.
Schedule of Goodwill	The change in the carrying amount of goodwill during fiscal 2017 is summarized as follows (in millions): Balance as of August 31, 2016 $ 947.8 Adjustments to provisional amounts (56.5 ) Foreign currency translation adjustments 9.6 Balance as of August 31, 2017 $ 900.9
Schedule of Acquired Intangible Assets	Summarized information for the Company’s acquired intangible assets is as follows (in millions): August 31, 2017 2016 Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Definite-lived intangible assets: Patents and patented technology $ 124.1 $ (51.5 ) $ 112.3 $ (39.9 ) Trademarks and trade names 27.2 (12.0 ) 27.2 (10.7 ) Distribution network 61.8 (35.2 ) 61.8 (33.0 ) Customer relationships 240.8 (43.1 ) 157.9 (29.3 ) Other 4.6 (4.6 ) 4.9 (4.8 ) Total definite-lived intangible assets $ 458.5 $ (146.4 ) $ 364.1 $ (117.7 ) Indefinite-lived trade names $ 136.7 $ 135.0
Schedule of Other Long-Term Assets	Other long-term assets consist of the following (in millions): August 31, 2017 2016 Deferred contract costs $ 6.7 $ 8.3 Investment in noncontrolling affiliate (1) — 8.0 Other (2) 6.5 6.7 Total other long-term assets $ 13.2 $ 23.0 _______________________________________ (1) The Company previously held an equity investment in an unconsolidated affiliate. This strategic investment was less than a 20% ownership interest in the privately-held affiliate, and the Company did not maintain power over or control of the entity. The Company accounted for this investment using the cost method. During fiscal 2017, this investment was sold, resulting in the recognition of a gain of $7.2 million . (2) Amounts primarily include deferred debt issuance costs related to the Company's revolving credit facility and company-owned life insurance investments. The Company maintains life insurance policies on 73 former employees primarily to satisfy obligations under certain deferred compensation plans. These company-owned life insurance policies are presented net of loans that are secured by these policies. This program is frozen, and no new policies were issued in the three-year period ended August 31, 2017 .
Schedule of Other Long-Term Liabilities	Other long-term liabilities consist of the following (in millions): August 31, 2017 2016 Deferred compensation and postretirement benefits other than pensions (1) $ 39.7 $ 37.3 Long-term warranty obligations 10.7 4.9 Unrecognized tax position liabilities, including interest (2) 7.0 6.1 Other (3) 6.2 10.7 Total other long-term liabilities $ 63.6 $ 59.0 _______________________________________ (1) The Company maintains several non-qualified retirement plans for the benefit of eligible employees, primarily deferred compensation plans. The deferred compensation plans provide for elective deferrals of an eligible employee’s compensation and, in some cases, matching contributions by the Company. In addition, one plan provides for an automatic contribution by the Company of 3% of an eligible employee’s compensation. The Company maintains life insurance policies on certain current and former officers and other key employees as a means of satisfying a portion of these obligations. (2) See the Income Taxes footnote for more information. (3) Amount primarily includes deferred revenue and deferred rent. The balance at August 31, 2016 includes a multi-employer pension plan withdrawal liability of $3.9 million , which was subsequently settled in full during fiscal 2017
Schedule of Interest Expense, Net	The following table summarizes the components of interest expense, net (in millions): Year Ended August 31, 2017 2016 2015 Interest expense $ 34.1 $ 33.3 $ 32.6 Interest income (1.6 ) (1.1 ) (1.1 ) Interest expense, net $ 32.5 $ 32.2 $ 31.5
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table presents the changes in each component of accumulated other comprehensive income (loss) during the year ended August 31, 2017 (in millions): Foreign Currency Items Defined Benefit Pension Plans Accumulated Other Comprehensive Loss Items Balance at August 31, 2016 $ (47.7 ) $ (91.7 ) $ (139.4 ) Other comprehensive income before reclassifications 19.0 12.6 31.6 Amounts reclassified from accumulated other comprehensive loss — 8.1 8.1 Net current period other comprehensive income 19.0 20.7 39.7 Balance at August 31, 2017 $ (28.7 ) $ (71.0 ) $ (99.7 )
Schedule of Comprehensive Income (Loss)	The following table presents the tax expense or benefit allocated to each component of other comprehensive income (loss) for the three years ended August 31, 2017 (in millions): Year Ended August 31, 2017 2016 2015 Before Tax Amount Tax (Expense) or Benefit Net of Tax Amount Before Tax Amount Tax (Expense) or Benefit Net of Tax Amount Before Tax Amount Tax (Expense) or Benefit Net of Tax Amount Foreign currency translation adjustments $ 19.0 $ — $ 19.0 $ (5.6 ) $ — $ (5.6 ) $ (24.0 ) $ — $ (24.0 ) Defined benefit pension plans: Actuarial gains (losses) 18.3 (5.7 ) 12.6 (42.2 ) 13.5 (28.7 ) (27.9 ) 10.7 (17.2 ) Amortization of defined benefit pension items: Prior service cost (1) 3.1 (0.7 ) 2.4 3.1 (1.1 ) 2.0 1.4 (0.6 ) 0.8 Actuarial losses (1) 8.9 (3.2 ) 5.7 4.9 (1.6 ) 3.3 4.1 (2.2 ) 1.9 Total defined benefit plans, net 30.3 (9.6 ) 20.7 (34.2 ) 10.8 (23.4 ) (22.4 ) 7.9 (14.5 ) Other comprehensive income (loss) $ 49.3 $ (9.6 ) $ 39.7 $ (39.8 ) $ 10.8 $ (29.0 ) $ (46.4 ) $ 7.9 $ (38.5 ) _______________________________________ (1) The before tax amount of these other comprehensive income (loss) components is included in net periodic pension cost. See the Pension and Defined Contribution Plans footnote for additional details.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Aug. 31, 2017
Fair Value Disclosures [Abstract]
Schedule of Carrying Value and Estimated Fair Value of Financial Instruments	The carrying values and estimated fair values of certain of the Company’s financial instruments were as follows at August 31, 2017 and 2016 (in millions): August 31, 2017 August 31, 2016 Carrying Value Fair Value Carrying Value Fair Value Assets: Investment in noncontrolling affiliate $ — $ — $ 8.0 $ 14.4 Liabilities: Senior unsecured public notes, net of unamortized discount and deferred costs $ 349.1 $ 379.7 $ 348.7 $ 388.8 Industrial revenue bond 4.0 4.0 4.0 4.0 Bank Loans 3.8 3.8 2.5 2.6

Pension and Defined Contribut27

Pension and Defined Contribution Plans (Tables)	12 Months Ended
	Aug. 31, 2017
Retirement Benefits [Abstract]
Schedule of Domestic and International Pension Plans	The following tables reflect the status of the Company’s domestic (U.S.-based) and international pension plans at August 31, 2017 and 2016 (in millions): Domestic Plans International Plans August 31, August 31, 2017 2016 2017 2016 Change in benefit obligation: Benefit obligation at beginning of year $ 223.0 $ 192.2 $ 57.3 $ 49.8 Service cost 3.5 3.6 0.2 0.1 Interest cost 6.9 8.0 1.1 1.7 Actuarial (gain) loss (10.2 ) 27.5 (3.2 ) 17.9 Benefits paid (7.7 ) (8.3 ) (1.0 ) (3.6 ) Other — — (0.9 ) (8.6 ) Benefit obligation at end of year 215.5 223.0 53.5 57.3 Change in plan assets: Fair value of plan assets at beginning of year $ 128.8 $ 123.9 $ 30.3 $ 32.6 Actual return on plan assets 12.1 7.9 4.1 5.2 Employer contributions 3.6 5.3 1.0 1.1 Benefits paid (7.7 ) (8.3 ) (1.0 ) (3.6 ) Other — — (0.3 ) (5.0 ) Fair value of plan assets at end of year 136.8 128.8 34.1 30.3 Funded status at the end of year $ (78.7 ) $ (94.2 ) $ (19.4 ) $ (27.0 ) Amounts recognized in the consolidated balance sheets consist of: Current liabilities $ (1.2 ) $ (1.3 ) $ — $ — Non-current liabilities (77.5 ) (92.9 ) (19.4 ) (27.0 ) Net amount recognized in Consolidated Balance Sheets $ (78.7 ) $ (94.2 ) $ (19.4 ) $ (27.0 ) Accumulated benefit obligation $ 215.3 $ 220.4 $ 53.5 $ 57.3 Pre-tax amounts in accumulated other comprehensive income: Prior service cost $ (7.7 ) $ (10.8 ) $ — $ — Net actuarial loss (78.7 ) (96.9 ) (18.2 ) (28.2 ) Amounts in accumulated other comprehensive income $ (86.4 ) $ (107.7 ) $ (18.2 ) $ (28.2 ) Estimated amounts that will be amortized from accumulated comprehensive income over the next fiscal year: Prior service cost $ 3.1 $ 3.1 $ — $ — Net actuarial loss 4.5 5.3 2.2 3.7
Schedule of Net Periodic Pension Cost	Components of net periodic pension cost for the fiscal years ended August 31, 2017 , 2016 , and 2015 included the following (in millions): Domestic Plans International Plans 2017 2016 2015 2017 2016 2015 Service cost $ 3.5 $ 3.6 $ 3.1 $ 0.2 $ 0.1 $ 0.1 Interest cost 6.9 8.0 6.8 1.1 1.7 1.8 Expected return on plan assets (9.4 ) (9.2 ) (9.2 ) (1.9 ) (1.9 ) (1.8 ) Amortization of prior service cost 3.1 3.1 1.4 — — — Recognized actuarial loss 5.3 3.0 2.2 3.6 1.9 1.9 Net periodic pension cost $ 9.4 $ 8.5 $ 4.3 $ 3.0 $ 1.8 $ 2.0
Schedule of Weighted Average Assumptions Used	Weighted average assumptions used in computing the benefit obligation are as follows: Domestic Plans International Plans 2017 2016 2017 2016 Discount rate 3.5 % 3.2 % 2.5 % 2.1 % Rate of compensation increase 5.5 % 5.5 % 3.2 % 2.8 % Weighted average assumptions used in computing net periodic benefit cost are as follows: Domestic Plans International Plans 2017 2016 2015 2017 2016 2015 Discount rate 3.2 % 4.3 % 4.0 % 2.1 % 2.1 % 3.6 % Expected return on plan assets 7.5 % 7.5 % 7.5 % 6.5 % 6.5 % 5.6 % Rate of compensation increase 5.5 % 5.5 % 5.5 % 3.2 % 2.8 % 3.1 %
Schedule of Pension Plan Asset Allocation	The following tables present the fair value of the domestic pension plan assets by major category as of August 31, 2017 and 2016 (in millions): Fair Value Measurements Fair Value as of Quoted Market Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs August 31, 2017 (Level 1) (Level 2) (Level 3) Mutual funds: Domestic large cap equity fund $ 43.4 $ 43.4 $ — $ — Foreign equity fund 21.5 21.5 — — Real estate fund 6.4 — — 6.4 Short-term fixed income investments 4.7 4.7 — — Fixed-income investments 46.2 — 46.2 — Collective trust: domestic small cap equities 14.6 — 14.6 — $ 136.8 Fair Value Measurements Fair Value as of Quoted Market Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs August 31, 2016 (Level 1) (Level 2) (Level 3) Mutual funds: Domestic large cap equity fund $ 46.5 $ 46.5 $ — $ — Foreign equity fund 12.3 12.3 — — Real estate fund 7.1 — — 7.1 Short-term fixed income investments 6.2 6.2 — — Fixed-income investments 44.2 — 44.2 — Collective trust: Domestic small cap equities 12.5 — 12.5 — $ 128.8 The following tables present the fair value of the international pension plan assets by major category as of August 31, 2017 and 2016 (in millions): Fair Value Measurements Fair Value as of Quoted Market Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs August 31, 2017 (Level 1) (Level 2) (Level 3) Equity securities $ 21.8 $ — $ 21.8 $ — Short-term investments 0.2 0.2 — — Real estate fund 1.6 — — 1.6 Multi-strategy investments 2.8 — 2.8 — Fixed-income investments 7.7 — 7.7 — $ 34.1 Fair Value Measurements Fair Value as of Quoted Market Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs August 31, 2016 (Level 1) (Level 2) (Level 3) Equity securities $ 18.5 $ — $ 18.5 $ — Short-term investments 0.5 0.5 — — Real estate fund 1.5 — — 1.5 Multi-strategy investments 2.7 — 2.7 — Fixed-income investments 7.1 — 7.1 — $ 30.3 The Company’s pension plan asset allocation at August 31, 2017 and 2016 by asset category is as follows: % of Plan Assets Domestic Plans International Plans 2017 2016 2017 2016 Equity securities 58.1 % 55.4 % 63.9 % 61.1 % Fixed income securities 37.2 % 39.1 % 23.2 % 25.0 % Multi-strategy investments — % — % 8.2 % 8.9 % Real estate 4.7 % 5.5 % 4.7 % 5.0 % Total 100.0 % 100.0 % 100.0 % 100.0 %
Schedule of Domestic Pension Plans' Level 3 Assets	The tables below present a rollforward of the domestic and international pension plans’ Level 3 assets for the years ended August 31, 2017 and 2016 (in millions): Domestic Real Estate Fund Year Ended August 31, 2017 2016 Balance, beginning of year $ 7.1 $ 6.3 Net unrealized gain relating to instruments still held at the reporting date 0.2 0.5 Shares sold (1.3 ) — Shares purchased, including from dividend reinvestment 0.4 0.3 Balance, end of year $ 6.4 $ 7.1 International Real Estate Fund Year Ended August 31, 2017 2016 Balance, beginning of year $ 1.5 $ 1.6 Net unrealized loss relating to instruments still held at the reporting date 0.1 (0.1 ) Balance, end of year $ 1.6 $ 1.5
Schedule of Expected Benefit Payments	Benefit payments are expected to be paid as follows for the years ending August 31 (in millions): Domestic Plans International Plans 2018 $ 8.3 $ 1.0 2019 8.4 1.0 2020 8.6 1.0 2021 12.3 1.1 2022 11.6 1.1 2023-2027 71.1 6.1

Debt and Lines of Credit (Table

Debt and Lines of Credit (Tables)	12 Months Ended
	Aug. 31, 2017
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	The Company’s debt at August 31, 2017 and 2016 consisted of the following (in millions): August 31, 2017 2016 Senior unsecured public notes due December 2019, principal $ 350.0 $ 350.0 Senior unsecured public notes due December 2019, unamortized discount and deferred costs (0.9 ) (1.3 ) Industrial revenue bond due June 2021 4.0 4.0 Bank loans 3.8 2.5 Total debt outstanding, net of unamortized discount and deferred costs $ 356.9 $ 355.2

Common Stock and Related Matt29

Common Stock and Related Matters (Tables)	12 Months Ended
	Aug. 31, 2017
Equity [Abstract]
Schedule of Changes in Common Stock	Changes in common stock for the years ended August 31, 2017 , 2016 , and 2015 were as follows (amounts and shares in millions): Common Stock Shares Amount (At par) Balance at August 31, 2014 52.6 $ 0.5 Issuance of restricted stock grants, net of cancellations 0.2 — Stock options exercised 0.2 — Balance at August 31, 2015 53.0 $ 0.5 Issuance of restricted stock grants, net of cancellations 0.1 — Stock options exercised 0.3 — Balance at August 31, 2016 53.4 $ 0.5 Issuance of restricted stock grants, net of cancellations 0.1 — Stock options exercised — * — Balance at August 31, 2017 53.5 $ 0.5 ___________________________ * Represents shares of less than 0.1 million.
Schedule of Earnings Per Share, Basic and Diluted	The following table calculates basic earnings per common share and diluted earnings per common share for the years ended August 31, 2017 , 2016 , and 2015 (in millions, except per share data): Year Ended August 31, 2017 2016 2015 Net income $ 321.7 $ 290.8 $ 222.1 Basic weighted average shares outstanding 43.1 43.5 43.1 Common stock equivalents 0.2 0.3 0.3 Diluted weighted average shares outstanding 43.3 43.8 43.4 Basic earnings per share $ 7.46 $ 6.67 $ 5.13 Diluted earnings per share $ 7.43 $ 6.63 $ 5.09

Share-Based Payments (Tables)

Share-Based Payments (Tables)	12 Months Ended
	Aug. 31, 2017
Share-based Compensation [Abstract]
Schedule of Restricted Stock Award Activity	Activity related to restricted stock awards during the fiscal year ended August 31, 2017 was as follows (in millions, except per share data): Number of Shares Weighted Average Grant Date Fair Value Per Share Outstanding at August 31, 2016 0.4 $ 159.50 Granted 0.1 $ 239.59 Vested (0.1) $ 138.50 Outstanding at August 31, 2017 0.4 $ 197.41
Schedule of Stock Options, Weighted Average Assumptions	The following weighted average assumptions were used to estimate the fair value of stock options granted in the fiscal years ended August 31: 2017 2016 2015 Dividend yield 0.2% 0.3% 0.4% Expected volatility 28.5% 30.7% 33.9% Risk-free interest rate 1.3% 1.4% 1.5% Expected life of options 4 years 4 years 4 years Weighted-average fair value of options $57.40 $52.83 $37.43
Schedule of Stock Option Transactions	Stock option activity during the years ended August 31, 2017 , 2016 , and 2015 was as follows: Outstanding Exercisable Number of Shares (in millions) Weighted Average Exercise Price Number of Shares (in millions) Weighted Average Exercise Price Outstanding at August 31, 2014 0.7 $50.58 0.5 $41.05 Granted 0.1 $135.63 Exercised (0.3) $39.35 Outstanding at August 31, 2015 0.5 $71.95 0.3 $51.05 Granted 0.1 $207.80 Exercised (0.3) $51.34 Outstanding at August 31, 2016 0.3 $129.85 0.1 $83.89 Granted — * 239.76 Exercised — * 139.69 Outstanding at August 31, 2017 0.3 156.43 0.2 106.54 Range of option exercise prices: $40.01 - $100.00 (average life - 5 years) 0.1 $61.59 0.1 $61.59 $100.01 - $160.00 (average life - 6.7 years) 0.1 $121.77 0.1 $117.73 $160.01 - $210.00 (average life - 8.2 years) 0.1 $207.80 — * $207.80 $210.01 - $239.76 (average life - 9.1 years) — * $239.76 — — ___________________________ * Represents shares of less than 0.1 million.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Aug. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Schedule of Changes in Product Warranty and Recall Reserves	Reserves for product warranty and recall costs are included in Other accrued liabilities and Other long-term liabilities on the Consolidated Balance Sheets . The changes in the reserves for product warranty and recall costs during the fiscal years ended August 31, 2017 , 2016 , and 2015 are summarized as follows (in millions): Year Ended August 31, 2017 2016 2015 Beginning balance $ 15.5 $ 9.6 $ 8.5 Warranty and recall costs 41.1 25.7 16.1 Payments and other deductions (33.3 ) (20.8 ) (15.0 ) Acquired warranty and recall liabilities — 1.0 — Ending balance $ 23.3 $ 15.5 $ 9.6

Special Charge Special Charge (

Special Charge Special Charge (Tables)	12 Months Ended
	Aug. 31, 2017
Restructuring and Related Activities [Abstract]
Details of Special Charges Incurred	The details of the special charges during the years ended August 31, 2017 and 2016 are summarized as follows (in millions): Year Ended August 31, 2017 2016 Severance and employee-related costs $ 11.2 $ 9.9 Lease termination and other costs 0.1 5.1 Total special charges $ 11.3 $ 15.0
Schedule of Changes in Remaining Reserves	The changes in the reserves related to these programs during the year ended August 31, 2017 are summarized as follows (in millions): Fiscal 2017 Actions Fiscal 2016 Actions Fiscal 2015 Actions Total Balance as of August 31, 2016 $ — $ 6.4 $ 0.2 $ 6.6 Severance costs 12.2 (1.0 ) — $ 11.2 Lease termination costs — 1.1 — $ 1.1 Payments made during the period (1.0 ) (5.1 ) (0.2 ) $ (6.3 ) Balance as of August 31, 2017 $ 11.2 $ 1.4 $ — $ 12.6

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Aug. 31, 2017
Income Tax Disclosure [Abstract]
Schedule of Provision for Income Taxes	The provision for income taxes consists of the following components (in millions): Year Ended August 31, 2017 2016 2015 Provision for current federal taxes $ 151.2 $ 139.6 $ 101.5 Provision for current state taxes 20.4 17.6 13.1 Provision for current foreign taxes 7.0 5.1 4.3 (Benefit) provision for deferred taxes (7.7 ) (8.5 ) 2.6 Total provision for income taxes $ 170.9 $ 153.8 $ 121.5
Schedule of Reconciliation of Federal Statutory Rate to Total Provision for Income Taxes	A reconciliation of the provision at the federal statutory rate to the total provision for income taxes is as follows (in millions): Year Ended August 31, 2017 2016 2015 Federal income tax computed at statutory rate $ 172.4 $ 155.6 $ 120.3 State income tax, net of federal income tax benefit 12.2 11.0 8.6 Foreign permanent differences and rate differential (1.6 ) (2.0 ) (1.4 ) Other, net (12.1 ) (10.8 ) (6.0 ) Total provision for income taxes $ 170.9 $ 153.8 $ 121.5
Schedule of Components of Net Deferred Income Taxes	Components of the net deferred income tax liabilities at August 31, 2017 and 2016 include (in millions): August 31, 2017 2016 Deferred income tax liabilities: Depreciation $ (20.0 ) $ (22.5 ) Goodwill and intangibles (194.9 ) (161.6 ) Other liabilities (4.0 ) (3.7 ) Total deferred income tax liabilities (218.9 ) (187.8 ) Deferred income tax assets: Self-insurance 4.1 4.0 Pension 33.7 41.7 Deferred compensation 32.9 28.9 Net operating losses 13.7 14.3 Other accruals not yet deductible 33.3 33.5 Other assets 10.6 12.3 Total deferred income tax assets 128.3 134.7 Valuation allowance (14.2 ) (16.4 ) Net deferred income tax liabilities $ (104.8 ) $ (69.5 )
Schedule of Change in Unrecognized Income Tax Benefit	A reconciliation of the change in the unrecognized income tax benefit (reported in Other long-term liabilities on the Consolidated Balance Sheets ) for the years ended August 31, 2017 and 2016 is as follows (in millions): Year Ended August 31, 2017 2016 Unrecognized tax benefits balance at beginning of year $ 5.2 $ 4.5 Additions based on tax positions related to the current year 1.2 1.0 Additions for tax positions of prior years 0.4 0.5 Reductions due to lapse of statute of limitations (0.8 ) (0.8 ) Unrecognized tax benefits balance at end of year $ 6.0 $ 5.2

Supplemental Disaggregated In34

Supplemental Disaggregated Information (Tables)	12 Months Ended
	Aug. 31, 2017
Segment Reporting [Abstract]
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas	The geographic distribution of the Company’s net sales, operating profit, income before provision for income taxes, and long-lived assets is summarized in the following table for the years ended August 31 (in millions): Year Ended August 31, 2017 2016 2015 Net sales (1) : Domestic (2) $ 3,123.1 $ 2,928.3 $ 2,450.1 International 382.0 363.0 256.6 Total $ 3,505.1 $ 3,291.3 $ 2,706.7 Operating profit: Domestic (2) $ 497.5 $ 457.6 $ 364.0 International 21.3 17.6 12.3 Total $ 518.8 $ 475.2 $ 376.3 Income before provision for income taxes: Domestic (2) $ 478.5 $ 430.8 $ 329.4 International 14.1 13.8 14.2 Total $ 492.6 $ 444.6 $ 343.6 Long-lived assets (3) : Domestic (2) $ 252.8 $ 254.5 $ 179.6 International 51.5 41.4 25.6 Total $ 304.3 $ 295.9 $ 205.2 _______________________________________ (1) Net sales are attributed to each country based on the selling location. (2) Domestic amounts include amounts for U.S. based operations. (3) Long-lived assets include net property, plant, and equipment, long-term deferred income tax assets, and other long-term assets as reflected in the Consolidated Balance Sheets .

Supplemental Guarantor Conden35

Supplemental Guarantor Condensed Consolidating Financial Statements (Tables)	12 Months Ended
	Aug. 31, 2017
Supplemental Guarantor Condensed Consolidating Financial Statements [Abstract]
CONDENSED CONSOLIDATING BALANCE SHEETS	CONDENSED CONSOLIDATING BALANCE SHEETS (In millions) At August 31, 2017 Parent Subsidiary Issuer Subsidiary Guarantor Non- Guarantors Consolidating Adjustments Consolidated ASSETS Current assets: Cash and cash equivalents $ 237.7 $ — $ — $ 73.4 $ — $ 311.1 Accounts receivable, net — 494.6 — 78.7 — 573.3 Inventories — 305.5 — 23.1 — 328.6 Other current assets 1.6 15.8 — 15.2 — 32.6 Total current assets 239.3 815.9 — 190.4 — 1,245.6 Property, plant, and equipment, net 0.2 228.3 — 59.2 — 287.7 Goodwill — 677.7 2.7 220.5 — 900.9 Intangible assets, net — 235.5 109.8 103.5 — 448.8 Deferred income taxes 51.6 — — 8.0 (56.2 ) 3.4 Other long-term assets 1.5 10.9 — 0.8 — 13.2 Investments in and amounts due from affiliates 1,500.3 330.4 234.2 — (2,064.9 ) — Total assets $ 1,792.9 $ 2,298.7 $ 346.7 $ 582.4 $ (2,121.1 ) $ 2,899.6 LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities: Accounts payable $ 0.9 $ 366.4 $ — $ 27.8 $ — $ 395.1 Current maturities of long-term debt — — — 0.4 — 0.4 Accrued liabilities 27.6 138.9 — 38.9 — 205.4 Total current liabilities 28.5 505.3 — 67.1 — 600.9 Long-term debt — 353.1 — 3.4 — 356.5 Deferred income taxes — 134.6 — 29.8 (56.2 ) 108.2 Other long-term liabilities 98.7 49.3 — 20.4 — 168.4 Amounts due to affiliates — — — 128.8 (128.8 ) — Total stockholders’ equity 1,665.7 1,256.4 346.7 332.9 (1,936.1 ) 1,665.6 Total liabilities and stockholders’ equity $ 1,792.9 $ 2,298.7 $ 346.7 $ 582.4 $ (2,121.1 ) $ 2,899.6 CONDENSED CONSOLIDATING BALANCE SHEETS (In millions) At August 31, 2016 Parent Subsidiary Issuer Subsidiary Guarantor Non- Guarantors Consolidating Adjustments Consolidated ASSETS Current assets: Cash and cash equivalents $ 368.2 $ — $ — $ 45.0 $ — $ 413.2 Accounts receivable, net — 503.0 — 69.8 — 572.8 Inventories — 274.7 — 20.5 — 295.2 Other current assets 2.5 14.3 — 24.9 — 41.7 Total current assets 370.7 792.0 — 160.2 — 1,322.9 Property, plant, and equipment, net 0.3 217.8 — 49.7 — 267.8 Goodwill — 735.8 2.7 209.3 — 947.8 Intangible assets, net — 168.1 113.4 99.9 — 381.4 Deferred income taxes 47.5 — — 6.5 (48.9 ) 5.1 Other long-term assets 1.4 20.4 — 1.2 — 23.0 Investments in and amounts due from affiliates 1,347.6 299.6 200.5 — (1,847.7 ) — Total assets $ 1,767.5 $ 2,233.7 $ 316.6 $ 526.8 $ (1,896.6 ) $ 2,948.0 LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities: Accounts payable $ 1.2 $ 371.3 $ — $ 28.5 $ — $ 401.0 Current maturities of long-term debt — — — 0.2 — 0.2 Other accrued liabilities 14.5 215.4 — 41.4 — 271.3 Total current liabilities 15.7 586.7 — 70.1 — 672.5 Long-term debt — 352.8 — 2.2 — 355.0 Deferred income taxes — 95.5 — 28.0 (48.9 ) 74.6 Other long-term liabilities 92.0 64.8 — 29.3 — 186.1 Amounts due to affiliates — — — 96.9 (96.9 ) — Total stockholders’ equity 1,659.8 1,133.9 316.6 300.3 (1,750.8 ) 1,659.8 Total liabilities and stockholders’ equity $ 1,767.5 $ 2,233.7 $ 316.6 $ 526.8 $ (1,896.6 ) $ 2,948.0
CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME	CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (In millions) Year Ended August 31, 2017 Parent Subsidiary Issuer Subsidiary Guarantor Non- Guarantors Consolidating Adjustments Consolidated Net sales: External sales $ — $ 3,105.2 $ — $ 399.9 $ — $ 3,505.1 Intercompany sales — — 49.4 179.2 (228.6 ) — Total sales — 3,105.2 49.4 579.1 (228.6 ) 3,505.1 Cost of products sold — 1,764.5 — 432.8 (173.4 ) 2,023.9 Gross profit — 1,340.7 49.4 146.3 (55.2 ) 1,481.2 Selling, distribution, and administrative expenses 45.0 824.8 3.6 132.8 (55.1 ) 951.1 Intercompany charges (56.9 ) 47.7 — 9.2 — — Special charge — 11.3 — — — 11.3 Operating profit 11.9 456.9 45.8 4.3 (0.1 ) 518.8 Interest expense, net 11.0 16.1 — 5.4 — 32.5 Equity earnings in subsidiaries (320.9 ) (7.7 ) — 0.2 328.4 — Miscellaneous (income) expense, net — (8.0 ) — 1.7 — (6.3 ) Income (loss) before provision for income taxes 321.8 456.5 45.8 (3.0 ) (328.5 ) 492.6 Provision (benefit) for income taxes 0.1 158.0 15.7 (2.9 ) — 170.9 Net income (loss) 321.7 298.5 30.1 (0.1 ) (328.5 ) 321.7 Other comprehensive income (loss) items: Foreign currency translation adjustments 19.0 19.0 — — (19.0 ) 19.0 Defined benefit pension plans, net 20.7 11.8 — 7.5 (19.3 ) 20.7 Other comprehensive income items after provision for income taxes 39.7 30.8 — 7.5 (38.3 ) 39.7 Comprehensive income $ 361.4 $ 329.3 $ 30.1 $ 7.4 $ (366.8 ) $ 361.4 CONDENSED CONSOL IDATING STATEMENTS OF COMPREHENSIVE INCOME (In millions) Year Ended August 31, 2016 Parent Subsidiary Issuer Subsidiary Guarantor Non- Guarantors Consolidating Adjustments Consolidated Net sales: External sales $ — $ 2,919.7 $ — $ 371.6 $ — $ 3,291.3 Intercompany sales — — 47.4 131.2 (178.6 ) — Total sales — 2,919.7 47.4 502.8 (178.6 ) 3,291.3 Cost of products sold — 1,602.2 — 379.3 (126.4 ) 1,855.1 Gross profit — 1,317.5 47.4 123.5 (52.2 ) 1,436.2 Selling, distribution, and administrative expenses 47.2 834.6 3.8 112.6 (52.2 ) 946.0 Intercompany charges (59.5 ) 50.4 — 9.1 — — Special charge — 15.0 — — — 15.0 Operating profit 12.3 417.5 43.6 1.8 — 475.2 Interest expense, net 10.5 16.1 — 5.6 — 32.2 Equity earnings in subsidiaries (289.2 ) (3.2 ) — 0.2 292.2 — Miscellaneous income, net — — — (1.6 ) — (1.6 ) Income (loss) before provision for income taxes 291.0 404.6 43.6 (2.4 ) (292.2 ) 444.6 Provision for income taxes 0.2 137.7 15.6 0.3 — 153.8 Net income (loss) 290.8 266.9 28.0 (2.7 ) (292.2 ) 290.8 Other comprehensive income (loss) items: Foreign currency translation adjustments (5.6 ) (5.6 ) — — 5.6 (5.6 ) Defined benefit pension plans, net (23.4 ) (11.4 ) — (9.5 ) 20.9 (23.4 ) Other comprehensive loss items after provision for income taxes (29.0 ) (17.0 ) — (9.5 ) 26.5 (29.0 ) Comprehensive income (loss) $ 261.8 $ 249.9 $ 28.0 $ (12.2 ) $ (265.7 ) $ 261.8 CONDENSED CONSOL IDATING STATEMENTS OF COMPREHENSIVE INCOME (In millions) Year Ended August 31, 2015 Parent Subsidiary Issuer Subsidiary Guarantor Non- Guarantors Consolidating Adjustments Consolidated Net sales: External sales $ — $ 2,446.9 $ — $ 259.8 $ — $ 2,706.7 Intercompany sales — — 41.2 105.5 (146.7 ) — Total sales — 2,446.9 41.2 365.3 (146.7 ) 2,706.7 Cost of products sold — 1,388.0 — 276.5 (103.4 ) 1,561.1 Gross profit — 1,058.9 41.2 88.8 (43.3 ) 1,145.6 Selling, distribution, and administrative expenses 34.0 684.4 4.0 77.8 (43.3 ) 756.9 Intercompany charges (45.4 ) 39.7 — 5.7 — — Special charge — 12.4 — — — 12.4 Operating profit 11.4 322.4 37.2 5.3 — 376.3 Interest expense (income), net 9.9 21.8 — (0.2 ) — 31.5 Equity earnings in subsidiaries (221.2 ) (5.2 ) — — 226.4 — Miscellaneous income, net — 2.8 — (1.6 ) — 1.2 Income before provision for income taxes 222.7 303.0 37.2 7.1 (226.4 ) 343.6 Provision for income taxes 0.6 103.5 14.9 2.5 — 121.5 Net income 222.1 199.5 22.3 4.6 (226.4 ) 222.1 Other comprehensive income (loss) items: Foreign currency translation adjustments (24.0 ) (24.0 ) — — 24.0 (24.0 ) Defined benefit pension plans, net (14.5 ) 6.3 — 0.5 (6.8 ) (14.5 ) Other comprehensive (loss) income items after provision for income taxes (38.5 ) (17.7 ) — 0.5 17.2 (38.5 ) Comprehensive income $ 183.6 $ 181.8 $ 22.3 $ 5.1 $ (209.2 ) $ 183.6
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS	CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS (In millions) Year Ended August 31, 2017 Parent Subsidiary Issuer Subsidiary Guarantor Non- Guarantors Consolidating Adjustments Consolidated Net cash provided by operating activities $ 241.9 $ 41.4 $ — $ 32.9 $ — $ 316.2 Cash flows from investing activities: Purchases of property, plant, and equipment — (53.1 ) — (14.2 ) — (67.3 ) Proceeds from sale of property, plant, and equipment — 0.2 — 5.3 — 5.5 Proceeds from sale of investment in unconsolidated affiliate — 13.2 — — — 13.2 Other investing activities — (0.2 ) — — — (0.2 ) Net cash used for investing activities — (39.9 ) — (8.9 ) — (48.8 ) Cash flow from financing activities: Issuance of long-term debt — — — 1.0 — 1.0 Proceeds from stock option exercises and other 3.0 — — — — 3.0 Repurchases of common stock (357.9 ) — — — — (357.9 ) Excess tax benefits from share-based payments 5.2 — — — — 5.2 Dividends paid (22.7 ) — — — — (22.7 ) Net cash (used for) provided by financing activities (372.4 ) — — 1.0 — (371.4 ) Effect of exchange rate changes on cash — (1.5 ) — 3.4 — 1.9 Net change in cash and cash equivalents (130.5 ) — — 28.4 — (102.1 ) Cash and cash equivalents at beginning of year 368.2 — — 45.0 — 413.2 Cash and cash equivalents at end of year $ 237.7 $ — $ — $ 73.4 $ — $ 311.1 CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS (In millions) Year Ended August 31, 2016 Parent Subsidiary Issuer Subsidiary Guarantor Non- Guarantors Consolidating Adjustments Consolidated Net cash provided by operating activities $ 277.0 $ 54.8 $ — $ 13.9 $ — $ 345.7 Cash flows from investing activities: Purchases of property, plant, and equipment — (67.1 ) — (16.6 ) — (83.7 ) Proceeds from sale of property, plant, and equipment — 0.2 — 2.0 — 2.2 Investments in subsidiaries (405.6 ) — — — 405.6 — Acquisitions of businesses and intangible assets — (393.9 ) — (229.3 ) — (623.2 ) Net cash used for investing activities (405.6 ) (460.8 ) — (243.9 ) 405.6 (704.7 ) Cash flows from financing activities: Issuance of long-term debt — — — 2.5 — 2.5 Proceeds from stock option exercises and other 14.2 — — — — 14.2 Excess tax benefits from share-based payments 25.6 — — — — 25.6 Intercompany capital — 405.6 — — (405.6 ) — Dividends paid (22.9 ) — — — — (22.9 ) Net cash provided by financing activities 16.9 405.6 — 2.5 (405.6 ) 19.4 Effect of exchange rate changes on cash — 0.4 — (4.4 ) — (4.0 ) Net change in cash and cash equivalents (111.7 ) — — (231.9 ) — (343.6 ) Cash and cash equivalents at beginning of year 479.9 — — 276.9 — 756.8 Cash and cash equivalents at end of year $ 368.2 $ — $ — $ 45.0 $ — $ 413.2 CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS (In millions) Year Ended August 31, 2015 Parent Subsidiary Issuer Subsidiary Guarantor Non- Guarantors Consolidating Adjustments Consolidated Net cash provided by operating activities $ 212.1 $ 55.2 $ — $ 21.6 $ — $ 288.9 Cash flows from investing activities: Purchases of property, plant, and equipment — (41.9 ) — (14.6 ) — (56.5 ) Proceeds from sale of property, plant, and equipment — 1.3 — — — 1.3 Investments in subsidiaries (254.7 ) (245.2 ) — — 499.9 — Acquisitions of businesses and intangible assets — (14.6 ) — — — (14.6 ) Other investing activities — (2.6 ) — — — (2.6 ) Net cash used for investing activities (254.7 ) (303.0 ) — (14.6 ) 499.9 (72.4 ) Cash flows from financing activities: Proceeds from stock option exercises and other 11.6 — — — — 11.6 Excess tax benefits from share-based payments 17.6 — — — — 17.6 Intercompany capital — 245.2 — 254.7 (499.9 ) — Dividends paid (22.7 ) — — — — (22.7 ) Other financing activities — — — (10.4 ) — (10.4 ) Net cash provided by (used for) financing activities 6.5 245.2 — 244.3 (499.9 ) (3.9 ) Effect of exchange rate changes on cash — (0.5 ) — (7.8 ) — (8.3 ) Net change in cash and cash equivalents (36.1 ) (3.1 ) — 243.5 — 204.3 Cash and cash equivalents at beginning of year 516.0 3.1 — 33.4 — 552.5 Cash and cash equivalents at end of year $ 479.9 $ — $ — $ 276.9 $ — $ 756.8

Quarterly Financial Data (Una36

Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Aug. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Data (Unaudited)	Fiscal Year 2017 (In millions) 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Net sales $ 851.2 $ 804.7 $ 891.6 $ 957.6 Gross profit $ 359.6 $ 335.8 $ 378.9 $ 406.9 Net income $ 81.7 $ 67.3 $ 82.2 $ 90.5 Basic earnings per share $ 1.87 $ 1.54 $ 1.91 $ 2.16 Diluted earnings per share $ 1.86 $ 1.53 $ 1.90 $ 2.15 Fiscal Year 2016 (In millions) 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Net sales $ 736.6 $ 777.8 $ 851.5 $ 925.5 Gross profit $ 319.4 $ 336.9 $ 377.9 $ 402.1 Net income $ 68.4 $ 65.5 $ 74.0 $ 82.9 Basic earnings per share $ 1.58 $ 1.50 $ 1.70 $ 1.90 Diluted earnings per share $ 1.57 $ 1.49 $ 1.69 $ 1.89

Description of Business and B37

Description of Business and Basis of Presentation (Details)	12 Months Ended
	Aug. 31, 2017Segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments	1

Significant Accounting Polici38

Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions	Aug. 31, 2017	Aug. 31, 2016
Accounting Policies [Abstract]
Liabilities associated with program revenues	$ 38.1	$ 41

Significant Accounting Polici39

Significant Accounting Policies - Concentrations of Credit Risk (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Concentration Risk [Line Items]
Period for return after shipment	4 months
Receivables from The Home Depot	$ 573.3	$ 572.8
Receivables | Home Depot
Concentration Risk [Line Items]
Sales as percentage of total sales (percent)	10.00%	10.00%
Net sales | Home Depot
Concentration Risk [Line Items]
Sales as percentage of total sales (percent)	4.00%		11.00%

Significant Accounting Polici40

Significant Accounting Policies - Inventories (Details) - USD ($) $ in Millions	Aug. 31, 2017	Aug. 31, 2016
Inventory, Net [Abstract]
Raw materials, supplies, and work in process	$ 176.5	$ 170.3
Finished goods	180.8	145.3
Inventory Gross	357.3	315.6
Less: Reserves	(28.7)	(20.4)
Total inventories	$ 328.6	$ 295.2

Significant Accounting Polici41

Significant Accounting Policies - Assets Held For Sale (Details) - USD ($)	Aug. 31, 2017	Aug. 31, 2016
Accounting Policies [Abstract]
Assets held for sale, total	$ 0	$ 5,400,000

Significant Accounting Polici42

Significant Accounting Policies - Goodwill and Other Intangibles (Details)	12 Months Ended
	Aug. 31, 2017USD ($)Segment	Aug. 31, 2016USD ($)	Aug. 31, 2015USD ($)
Goodwill [Roll Forward]
Goodwill	$ 947,800,000
Adjustments to provisional amounts	(56,500,000)
Foreign currency translation adjustments	9,600,000
Goodwill	900,900,000	$ 947,800,000
Amortized intangible assets, Gross Carrying Amount	458,500,000	364,100,000
Accumulated Amortization	(146,400,000)	(117,700,000)
Amortization expense of finite-lived intangible assets	28,000,000	21,400,000	$ 11,000,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization expense in fiscal 2018	26,400,000
Amortization expense in fiscal 2019	26,400,000
Amortization expense in fiscal 2020	26,000,000
Amortization expense in fiscal 2021	25,700,000
Amortization expense in fiscal 2022	22,300,000
Goodwill impairment charge	0	0	0
Intangible asset impairment charge	$ 0	5,100,000	0
Number of reporting units | Segment	1
Patents and patented technology
Goodwill [Roll Forward]
Amortized intangible assets, Gross Carrying Amount	$ 124,100,000	112,300,000
Accumulated Amortization	(51,500,000)	(39,900,000)
Trademarks and trade names
Goodwill [Roll Forward]
Amortized intangible assets, Gross Carrying Amount	27,200,000	27,200,000
Accumulated Amortization	(12,000,000)	(10,700,000)
Distribution network
Goodwill [Roll Forward]
Amortized intangible assets, Gross Carrying Amount	61,800,000	61,800,000
Accumulated Amortization	(35,200,000)	(33,000,000)
Customer relationships
Goodwill [Roll Forward]
Amortized intangible assets, Gross Carrying Amount	240,800,000	157,900,000
Accumulated Amortization	(43,100,000)	(29,300,000)
Other
Goodwill [Roll Forward]
Amortized intangible assets, Gross Carrying Amount	4,600,000	4,900,000
Accumulated Amortization	(4,600,000)	(4,800,000)
Unamortized trade names
Goodwill [Roll Forward]
Unamortized trade names, Gross Carrying Amount	136,700,000	$ 135,000,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Intangible asset impairment charge	$ 0		$ 0

Significant Accounting Polici43

Significant Accounting Policies - Other Long-Term Assets and Liabilities (Details) $ in Millions	12 Months Ended
	Aug. 31, 2017USD ($)Employee	Aug. 31, 2016USD ($)	Aug. 31, 2015USD ($)
Other Long-Term Assets [Abstract]
Deferred contract costs	$ 6.7	$ 8.3
Investment in noncontrolling affiliate	0	8
Other	6.5	6.7
Total other long-term assets	13.2	23
Gain on sale of investment in unconsolidated affiliate	$ 7.2	0	$ 0
Number of former employees covered under life insurance policy | Employee	73
Other Long-Term Liabilities [Abstract]
Deferred compensation and postretirement benefits other than pensions	$ 39.7	37.3
Long-term warranty obligations	10.7	4.9
Uncertain tax positions liability, including interest	7	6.1
Other	6.2	10.7
Total other long-term liabilities	$ 63.6	59
Percentage contribution rate of eligible employee's compensation	3.00%
Multiemployer plan withdrawal liability		$ 3.9

Significant Accounting Polici44

Significant Accounting Policies - Selling, Distribution and Administrative Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Accounting Policies [Abstract]
Other shipping and handling costs	$ 138.3	$ 124	$ 105.6
Share-based Compensation [Abstract]
Share-based payment expense	32	27.7	18.2
Income tax benefit for share-based compensation	11.1	9.6	6.4
Excess tax benefits from share-based payments	5.2	25.6	17.6
Research and development expense	52	47.1	41.1
Advertising costs	$ 18.6	$ 18.4	$ 12

Significant Accounting Polici45

Significant Accounting Policies - Depreciation (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 46.6	$ 41.2	$ 34.8
Minimum | Building and related improvements
Property, Plant and Equipment [Line Items]
Useful lives of plant and equipment, minimum	10 years
Minimum | Machinery and equipment
Property, Plant and Equipment [Line Items]
Useful lives of plant and equipment, minimum	3 years
Maximum | Building and related improvements
Property, Plant and Equipment [Line Items]
Useful lives of plant and equipment, minimum	40 years
Maximum | Machinery and equipment
Property, Plant and Equipment [Line Items]
Useful lives of plant and equipment, minimum	15 years

Significant Accounting Polici46

Significant Accounting Policies - Interest Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Interest Revenue (Expense), Net [Abstract]
Interest expense	$ 34.1	$ 33.3	$ 32.6
Interest income	(1.6)	(1.1)	(1.1)
Interest expense, net	$ 32.5	$ 32.2	$ 31.5

Significant Accounting Polici47

Significant Accounting Policies - Miscelleneous Expense (Income), Net (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Financial Statement Line Items with Differences in Reported Amount and Reporting Currency Denominated Amounts [Line Items]
Gain on sale of investment in unconsolidated affiliate	$ 7.2	$ 0	$ 0
Miscellaneous expense (income), net
Financial Statement Line Items with Differences in Reported Amount and Reporting Currency Denominated Amounts [Line Items]
Income (expense) relating to foreign currency items	$ 0.5	$ (0.8)	$ (0.7)

Significant Accounting Polici48

Significant Accounting Policies - Changes of Accumulated Other Comprehensive Income Loss Items, net of tax (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at August 31, 2016	$ 1,659.8	$ 1,360	$ 1,163.5
Other comprehensive income before reclassifications	31.6
Amounts reclassified from accumulated other comprehensive loss	8.1
Other comprehensive income (loss) items, net of tax	39.7	(29)	(38.5)
Balance at August 31, 2017	1,665.6	1,659.8	1,360
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at August 31, 2016	(47.7)
Other comprehensive income before reclassifications	19
Amounts reclassified from accumulated other comprehensive loss	0
Other comprehensive income (loss) items, net of tax	19
Balance at August 31, 2017	(28.7)	(47.7)
Defined Benefit Pension Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at August 31, 2016	(91.7)
Other comprehensive income before reclassifications	12.6
Amounts reclassified from accumulated other comprehensive loss	8.1
Other comprehensive income (loss) items, net of tax	20.7
Balance at August 31, 2017	(71)	(91.7)
Accumulated Other Comprehensive Loss Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at August 31, 2016	(139.4)	(110.4)	(71.9)
Other comprehensive income (loss) items, net of tax	39.7	(29)	(38.5)
Balance at August 31, 2017	$ (99.7)	$ (139.4)	$ (110.4)

Significant Accounting Polici49

Significant Accounting Policies - Components of Other Comprehensive Income Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Foreign currency translation adjustments - Before Tax Amount
Foreign currency translation adjustments	$ 19	$ (5.6)	$ (24)
Foreign currency translation adjustments - Tax (Expense) or Benefit
Foreign currency translation adjustments	0	0	0
Foreign currency translation adjustments - Net of Tax Amount
Foreign currency translation adjustments	19	(5.6)	(24)
Defined benefit pension plans - Before Tax Amounts
Actuarial gains (losses)	18.3	(42.2)	(27.9)
Amortization of Defined benefit pension items - Prior service cost	3.1	3.1	1.4
Amortization of Defined benefit pension items - Actuarial losses	8.9	4.9	4.1
Total defined benefit plans, net - before tax	30.3	(34.2)	(22.4)
Defined benefit pension plans - Tax (Expense) or Benefit
Actuarial gains (losses)	5.7	(13.5)	(10.7)
Amortization of Defined benefit pension items - Prior service cost	0.7	1.1	0.6
Amortization of Defined benefit pension items - Actuarial losses	(3.2)	(1.6)	(2.2)
Total defined benefit plans, net - tax	(9.6)	10.8	7.9
Defined benefit pension plans - Net of Tax Amount
Actuarial gains (losses)	12.6	(28.7)	(17.2)
Amortization of Defined benefit pension items - Prior service cost	2.4	2	0.8
Amortization of Defined benefit pension items - Actuarial losses	5.7	3.3	1.9
Total defined benefit plans, net - net of tax	20.7	(23.4)	(14.5)
Other comprehensive income (loss) before tax	49.3	(39.8)	(46.4)
Other comprehensive income (loss), tax	9.6	(10.8)	(7.9)
Other comprehensive income (loss) items, net of tax	$ (39.7)	$ 29	$ 38.5

Acquisitions and Investments -

Acquisitions and Investments - Fiscal 2016 Acquisitions (Details) - USD ($) $ in Millions	Dec. 10, 2015	Sep. 01, 2015	Feb. 28, 2017	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Business Acquisition [Line Items]
Decrease to goodwill				$ 56.5
Amortization expense of finite-lived intangible assets				28	$ 21.4	$ 11
Juno Lighting LLC
Business Acquisition [Line Items]
Payments to acquire business	$ 380
Increase to intangible assets, net			$ 81.1
Decrease to goodwill			50.5
Increase to deferred income tax liabilities			29.6
Decrease to net operating working capital			$ 1
Amortization expense of finite-lived intangible assets				$ 1.5
Distech Controls, Inc. (Distech)
Business Acquisition [Line Items]
Payments to acquire business		$ 240

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 311.1	$ 413.2	$ 756.8	$ 552.5
Assets:
Investment in noncontrolling affiliate	0	8
Liabilities:
Gain on sale of investment	7.2	0	$ 0
Carrying Value
Assets:
Investment in noncontrolling affiliate	0	8
Fair Value
Assets:
Investment in noncontrolling affiliate	0	14.4
Senior unsecured public notes, net of unamortized discount and deferred costs | Carrying Value
Liabilities:
Carrying and estimated fair value of financial instruments	349.1	348.7
Senior unsecured public notes, net of unamortized discount and deferred costs | Fair Value
Liabilities:
Carrying and estimated fair value of financial instruments	379.7	388.8
Industrial revenue bond | Carrying Value
Liabilities:
Carrying and estimated fair value of financial instruments	4	4
Industrial revenue bond | Fair Value
Liabilities:
Carrying and estimated fair value of financial instruments	4	4
Bank Loans | Carrying Value
Liabilities:
Carrying and estimated fair value of financial instruments	3.8	2.5
Bank Loans | Fair Value
Liabilities:
Carrying and estimated fair value of financial instruments	3.8	2.6
Fair value measured on recurring basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 311.1	$ 413.2

Pension and Defined Contribut52

Pension and Defined Contribution Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Amounts recognized in the consolidated balance sheets consist of:
Non-current liabilities	$ (96.9)	$ (119.9)
UNITED STATES | Pension Plan
Change in Benefit Obligation:
Benefit obligation at beginning of year	223	192.2
Service cost	3.5	3.6	$ 3.1
Interest cost	6.9	8	6.8
Actuarial (gain) loss	(10.2)	27.5
Benefits paid	(7.7)	(8.3)
Other	0	0
Benefit obligation at end of year	215.5	223	192.2
Change in plan assets:
Fair value of plan assets at beginning of year	128.8	123.9
Actual return on plan assets	12.1	7.9
Employer contributions	3.6	5.3
Benefits paid	(7.7)	(8.3)
Other	0	0
Fair value of plan assets at end of year	136.8	128.8	123.9
Funded status at end of year:
Funded status at the end of year	(78.7)	(94.2)
Amounts recognized in the consolidated balance sheets consist of:
Current liabilities	(1.2)	(1.3)
Non-current liabilities	(77.5)	(92.9)
Net amount recognized in Consolidated Balance Sheets	(78.7)	(94.2)
Accumulated benefit obligation	215.3	220.4
Pre-tax amounts in accumulated other comprehensive income:
Prior service cost	(7.7)	(10.8)
Net actuarial loss	(78.7)	(96.9)
Amounts in accumulated other comprehensive income	(86.4)	(107.7)
Estimated amounts that will be amortized from accumulated comprehensive income over the next fiscal year:
Prior service cost	3.1	3.1
Net actuarial loss	4.5	5.3
International Plans | Pension Plan
Change in Benefit Obligation:
Benefit obligation at beginning of year	57.3	49.8
Service cost	0.2	0.1	0.1
Interest cost	1.1	1.7	1.8
Actuarial (gain) loss	(3.2)	17.9
Benefits paid	(1)	(3.6)
Other	(0.9)	(8.6)
Benefit obligation at end of year	53.5	57.3	49.8
Change in plan assets:
Fair value of plan assets at beginning of year	30.3	32.6
Actual return on plan assets	4.1	5.2
Employer contributions	1	1.1
Benefits paid	(1)	(3.6)
Other	(0.3)	(5)
Fair value of plan assets at end of year	34.1	30.3	$ 32.6
Funded status at end of year:
Funded status at the end of year	(19.4)	(27)
Amounts recognized in the consolidated balance sheets consist of:
Current liabilities	0	0
Non-current liabilities	(19.4)	(27)
Net amount recognized in Consolidated Balance Sheets	(19.4)	(27)
Accumulated benefit obligation	53.5	57.3
Pre-tax amounts in accumulated other comprehensive income:
Prior service cost	0	0
Net actuarial loss	(18.2)	(28.2)
Amounts in accumulated other comprehensive income	(18.2)	(28.2)
Estimated amounts that will be amortized from accumulated comprehensive income over the next fiscal year:
Prior service cost	0	0
Net actuarial loss	$ 2.2	$ 3.7

Pension and Defined Contribut53

Pension and Defined Contribution Plans - Net Periodic Pension Cost and Pension Plan Asset Allocation (Details) - Pension Plan - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
UNITED STATES
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 3.5	$ 3.6	$ 3.1
Interest cost	6.9	8	6.8
Expected return on plan assets	(9.4)	(9.2)	(9.2)
Amortization of prior service cost	3.1	3.1	1.4
Recognized actuarial loss	5.3	3	2.2
Net periodic pension cost	$ 9.4	$ 8.5	$ 4.3
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	3.50%	3.20%
Rate of compensation increase	5.50%	5.50%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.20%	4.30%	4.00%
Expected return on plan assets	7.50%	7.50%	7.50%
Rate of compensation increase	5.50%	5.50%	5.50%
Reduction in net periodic pension cost per 100 basis point increase in benefit obligation discount rate	$ 1.2
Additional net periodic pension cost per 100 basis point decrease in expected return on plan assets rate	$ 1.4
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Pension plan asset allocation, percentage	100.00%	100.00%
UNITED STATES | Equity securities
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Targeted asset allocation, percentage	55.00%
Pension plan asset allocation, percentage	58.10%	55.40%
UNITED STATES | Fixed income securities
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Targeted asset allocation, percentage	40.00%
Pension plan asset allocation, percentage	37.20%	39.10%
UNITED STATES | Multi-strategy investments
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Pension plan asset allocation, percentage	0.00%	0.00%
UNITED STATES | Real estate
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Targeted asset allocation, percentage	5.00%
Pension plan asset allocation, percentage	4.70%	5.50%
International Plans
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 0.2	$ 0.1	$ 0.1
Interest cost	1.1	1.7	1.8
Expected return on plan assets	(1.9)	(1.9)	(1.8)
Amortization of prior service cost	0	0	0
Recognized actuarial loss	3.6	1.9	1.9
Net periodic pension cost	$ 3	$ 1.8	$ 2
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	2.50%	2.10%
Rate of compensation increase	3.20%	2.80%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	2.10%	2.10%	3.60%
Expected return on plan assets	6.50%	6.50%	5.60%
Rate of compensation increase	3.20%	2.80%	3.10%
Reduction in net periodic pension cost per 100 basis point increase in benefit obligation discount rate	$ 1.2
Additional net periodic pension cost per 100 basis point decrease in expected return on plan assets rate	$ 0.3
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Pension plan asset allocation, percentage	100.00%	100.00%
International Plans | Equity securities
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Targeted asset allocation, percentage	62.00%
Pension plan asset allocation, percentage	63.90%	61.10%
International Plans | Fixed income securities
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Targeted asset allocation, percentage	23.00%
Pension plan asset allocation, percentage	23.20%	25.00%
International Plans | Multi-strategy investments
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Targeted asset allocation, percentage	10.00%
Pension plan asset allocation, percentage	8.20%	8.90%
International Plans | Real estate
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Targeted asset allocation, percentage	5.00%
Pension plan asset allocation, percentage	4.70%	5.00%

Pension and Defined Contribut54

Pension and Defined Contribution Plans - Fair Value Measurements and Benefit Payments (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2017	Aug. 31, 2016
Multiemployer Pension Plans [Abstract]
Multiemployer plan withdrawal liability					$ 3.9
Multiemployer Defined Pension Plans
Multiemployer Pension Plans [Abstract]
Contributions to Multi-employer Pension Plans	$ 0.5	$ 0.7	$ 0.5
Multiemployer plan withdrawal liability					3.9
Defined Contribution Plan
Defined Contribution Plan [Abstract]
Defined contribution plan, cost recognized	$ 8	6.9	5.6
Common stock included in defined contribution plan, market value				$ 12.2
Common stock included in defined contribution plan as percentage of total fair value of assets in plan	3.60%
UNITED STATES | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	$ 128.8	123.9	123.9	136.8	128.8
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	128.8	123.9
Fair value of plan assets at end of year	136.8	128.8	123.9
Employer expected contribution to defined benefit plans in next fiscal year				4
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2,018				8.3
2,019				8.4
2,020				8.6
2,021				12.3
2,022				11.6
2023-2027				71.1
UNITED STATES | Pension Plan | Mutual Funds: Large blend fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	46.5	46.5		43.4	46.5
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	46.5
Fair value of plan assets at end of year	43.4	46.5
UNITED STATES | Pension Plan | Mutual Funds: Foreign large blend fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	12.3	12.3		21.5	12.3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	12.3
Fair value of plan assets at end of year	21.5	12.3
UNITED STATES | Pension Plan | Real estate fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	7.1	7.1		6.4	7.1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	7.1
Fair value of plan assets at end of year	6.4	7.1
UNITED STATES | Pension Plan | Short-term fixed income investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	6.2	6.2		4.7	6.2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	6.2
Fair value of plan assets at end of year	4.7	6.2
UNITED STATES | Pension Plan | Fixed-income investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	44.2	44.2		46.2	44.2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	44.2
Fair value of plan assets at end of year	46.2	44.2
UNITED STATES | Pension Plan | Collective trust: domestic small cap equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	12.5	12.5		14.6	12.5
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	12.5
Fair value of plan assets at end of year	14.6	12.5
UNITED STATES | Pension Plan | Level 1 | Mutual Funds: Large blend fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	46.5	46.5		43.4	46.5
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	46.5
Fair value of plan assets at end of year	43.4	46.5
UNITED STATES | Pension Plan | Level 1 | Mutual Funds: Foreign large blend fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	12.3	12.3		21.5	12.3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	12.3
Fair value of plan assets at end of year	21.5	12.3
UNITED STATES | Pension Plan | Level 1 | Real estate fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0	0		0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
UNITED STATES | Pension Plan | Level 1 | Short-term fixed income investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	6.2	6.2		4.7	6.2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	6.2
Fair value of plan assets at end of year	4.7	6.2
UNITED STATES | Pension Plan | Level 1 | Fixed-income investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0	0		0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
UNITED STATES | Pension Plan | Level 1 | Collective trust: domestic small cap equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0	0		0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
UNITED STATES | Pension Plan | Level 2 | Mutual Funds: Large blend fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0	0		0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
UNITED STATES | Pension Plan | Level 2 | Mutual Funds: Foreign large blend fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0	0		0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
UNITED STATES | Pension Plan | Level 2 | Real estate fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0	0		0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
UNITED STATES | Pension Plan | Level 2 | Short-term fixed income investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0	0		0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
UNITED STATES | Pension Plan | Level 2 | Fixed-income investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	44.2	44.2		46.2	44.2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	44.2
Fair value of plan assets at end of year	46.2	44.2
UNITED STATES | Pension Plan | Level 2 | Collective trust: domestic small cap equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	12.5	12.5		14.6	12.5
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	12.5
Fair value of plan assets at end of year	14.6	12.5
UNITED STATES | Pension Plan | Level 3 | Mutual Funds: Large blend fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0	0		0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
UNITED STATES | Pension Plan | Level 3 | Mutual Funds: Foreign large blend fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0	0		0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
UNITED STATES | Pension Plan | Level 3 | Real estate fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	7.1	6.3	6.3	6.4	7.1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	7.1	6.3
Net unrealized gain (loss) relating to instruments still held at the reporting date	0.2	0.5
Shares sold	(1.3)	0
Shares purchased, including from dividend reinvestment	0.4	0.3
Fair value of plan assets at end of year	6.4	7.1	6.3
UNITED STATES | Pension Plan | Level 3 | Short-term fixed income investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0	0		0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
UNITED STATES | Pension Plan | Level 3 | Fixed-income investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0	0		0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
UNITED STATES | Pension Plan | Level 3 | Collective trust: domestic small cap equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0	0		0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
International Plans | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	30.3	32.6	32.6	34.1	30.3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	30.3	32.6
Fair value of plan assets at end of year	34.1	30.3	32.6
Employer expected contribution to defined benefit plans in next fiscal year				1.1
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2,018				1
2,019				1
2,020				1
2,021				1.1
2,022				1.1
2023-2027				6.1
International Plans | Pension Plan | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	18.5	18.5		21.8	18.5
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	18.5
Fair value of plan assets at end of year	21.8	18.5
International Plans | Pension Plan | Real estate fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	1.5	1.5		1.6	1.5
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	1.5
Fair value of plan assets at end of year	1.6	1.5
International Plans | Pension Plan | Short-term fixed income investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0.5	0.5		0.2	0.5
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0.5
Fair value of plan assets at end of year	0.2	0.5
International Plans | Pension Plan | Fixed-income investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	7.1	7.1		7.7	7.1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	7.1
Fair value of plan assets at end of year	7.7	7.1
International Plans | Pension Plan | Multi-strategy investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	2.7	2.7		2.8	2.7
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	2.7
Fair value of plan assets at end of year	2.8	2.7
International Plans | Pension Plan | Level 1 | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0	0		0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
International Plans | Pension Plan | Level 1 | Real estate fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0	0		0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
International Plans | Pension Plan | Level 1 | Short-term fixed income investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0.5	0.5		0.2	0.5
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0.5
Fair value of plan assets at end of year	0.2	0.5
International Plans | Pension Plan | Level 1 | Fixed-income investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0	0		0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
International Plans | Pension Plan | Level 1 | Multi-strategy investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0	0		0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
International Plans | Pension Plan | Level 2 | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	18.5	18.5		21.8	18.5
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	18.5
Fair value of plan assets at end of year	21.8	18.5
International Plans | Pension Plan | Level 2 | Real estate fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0	0		0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
International Plans | Pension Plan | Level 2 | Short-term fixed income investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0	0		0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
International Plans | Pension Plan | Level 2 | Fixed-income investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	7.1	7.1		7.7	7.1
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	7.1
Fair value of plan assets at end of year	7.7	7.1
International Plans | Pension Plan | Level 2 | Multi-strategy investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	2.7	2.7		2.8	2.7
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	2.7
Fair value of plan assets at end of year	2.8	2.7
International Plans | Pension Plan | Level 3 | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0	0		0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
International Plans | Pension Plan | Level 3 | Real estate fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	1.5	1.6	1.6	1.6	1.5
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	1.5	1.6
Net unrealized gain (loss) relating to instruments still held at the reporting date	0.1	(0.1)
Fair value of plan assets at end of year	1.6	1.5	$ 1.6
International Plans | Pension Plan | Level 3 | Short-term fixed income investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0	0		0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
International Plans | Pension Plan | Level 3 | Fixed-income investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0	0		0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
International Plans | Pension Plan | Level 3 | Multi-strategy investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets by major category	0	0		$ 0	$ 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	$ 0	$ 0

Debt and Lines of Credit - Debt

Debt and Lines of Credit - Debt (Details) - USD ($)	Dec. 01, 2009	Aug. 31, 2017	Aug. 31, 2016
Debt Instrument [Line Items]
Total debt outstanding		$ 356,900,000	$ 355,200,000
Long-term Debt, Fiscal Year Maturity [Abstract]
2,018		400,000
2,019		400,000
2,020		350,500,000
2,021		4,500,000
2,022		400,000
After 2,022		1,600,000
Senior Unsecured Notes | Unsecured Notes
Debt Instrument [Line Items]
Total debt outstanding		350,000,000	350,000,000
Senior unsecured public notes due December 2019, unamortized discount and deferred costs		(900,000)	(1,300,000)
Senior Unsecured Notes | Unsecured Notes | ABL
Debt Instrument [Line Items]
Aggregate principal amount of unsecured notes	$ 350,000,000
Long-term debt, interest rate	6.00%
Senior unsecured notes, discount rate	99.797%
Senior unsecured notes, maturity terms (years)	10 years
Capitalized deferred issuance costs	$ 3,100,000
Term of notes	10 years
Industrial Revenue Bond | Industrial revenue bond
Debt Instrument [Line Items]
Total debt outstanding		$ 4,000,000	$ 4,000,000
Long-term debt, interest rate		0.90%	0.70%
Bank Loans | Fixed-rate Bank Loans
Debt Instrument [Line Items]
Total debt outstanding		$ 3,800,000	$ 2,500,000
Minimum | Bank Loans | Fixed-rate Bank Loans
Debt Instrument [Line Items]
Term of notes		7 years
Interest rate (percent)		0.80%
Maximum | Bank Loans | Fixed-rate Bank Loans
Debt Instrument [Line Items]
Term of notes		12 years
Interest rate (percent)		2.00%

Debt and Lines of Credit - Line

Debt and Lines of Credit - Lines of Credit (Details)	12 Months Ended
	Aug. 31, 2017USD ($)	Aug. 31, 2016USD ($)	Aug. 27, 2014USD ($)
Revolving Credit Facility
Line of Credit Facility [Line Items]
Outstanding letters of credit	$ 5,300,000
Lines of Credit
Line of Credit Facility [Line Items]
Outstanding letters of credit	10,300,000
Lines of Credit | Revolving Credit Facility
Line of Credit Facility [Line Items]
Revolving credit facility	250,000,000		$ 250,000,000
Borrowings outstanding under credit facility	$ 0	$ 0
Minimum Interest Coverage Ratio	2.50
Maximum Leverage Ratio	3.50
Additional borrowing capacity under revolving credit facility	$ 244,700,000
Lines of Credit | Revolving Credit Facility | Minimum
Line of Credit Facility [Line Items]
Applicable margins as determined by leverage ratio	1.00%
Commitment fees rate	0.125%
Lines of Credit | Revolving Credit Facility | Maximum
Line of Credit Facility [Line Items]
Applicable margins as determined by leverage ratio	1.575%
Commitment fees rate	0.30%

Common Stock and Related Matt57

Common Stock and Related Matters (Details) - USD ($) $ in Millions	2 Months Ended	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015	Jun. 30, 2017
Common Stock [Roll Forward]
Common Stock, Balance beginning of period (shares)		53,415,687
Common Stock, Balance end of period (shares)	53,549,840	53,549,840	53,415,687
Common Stock, Amount (at par), Balance beginning of period		$ 0.5
Issuance of restricted stock grants, net of cancellations, Amount		16.8	$ 11.1	$ 6.4
Stock options exercised, Amount		2.1	13.5	$ 11.1
Common Stock, Amount (at par), Balance end of period	$ 0.5	$ 0.5	$ 0.5
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Remaining repurchased shares recorded as treasury stock	11,678,002	11,678,002	9,679,457
Treasury stock at original repurchase cost	$ 776.1	$ 776.1	$ 418.6
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock authorized (in shares)	50,000,000	50,000,000	50,000,000
Preferred stock, issued (in shares)	0	0	0
Preferred stock, outstanding (in shares)	0	0	0
Previously Authorized Plan
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Reacquired shares of outstanding common stock		2,000,000
June 2017 Plan
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Reacquired shares of outstanding common stock	0
Number of repurchase shares, authorized					2,000,000
Common Stock
Common Stock [Roll Forward]
Common Stock, Balance beginning of period (shares)		53,400,000	53,000,000	52,600,000
Issuance of restricted stock grants, net of cancellations (shares)		100,000	100,000	200,000
Stock options exercised (shares)		0	300,000	200,000
Common Stock, Balance end of period (shares)	53,500,000	53,500,000	53,400,000	53,000,000
Common Stock, Amount (at par), Balance beginning of period		$ 0.5	$ 0.5	$ 0.5
Issuance of restricted stock grants, net of cancellations, Amount		0	0	0
Stock options exercised, Amount		0	0	0
Common Stock, Amount (at par), Balance end of period	$ 0.5	$ 0.5	$ 0.5	$ 0.5

Common Stock and Related Matt58

Common Stock and Related Matters - Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Earnings per Share, Basic and Diluted [Line Items]
Income attributable to participating securities										$ (0.4)	$ (1)
Earnings per share:
Net income									$ 321.7	$ 290.8	$ 222.1
Basic weighted average shares outstanding (in shares)									43,100	43,500	43,100
Common stock equivalents (in shares)									200	300	300
Diluted weighted average number of shares outstanding (in shares)									43,300	43,800	43,400
Basic earnings per share (in dollars per share)	$ 2.16	$ 1.91	$ 1.54	$ 1.87	$ 1.90	$ 1.70	$ 1.50	$ 1.58	$ 7.46	$ 6.67	$ 5.13
Diluted earnings per share (in dollars per share)	$ 2.15	$ 1.90	$ 1.53	$ 1.86	$ 1.89	$ 1.69	$ 1.49	$ 1.57	$ 7.43	$ 6.63	$ 5.09
Stock Options
Earnings per share:
Stock options excluded from diluted earnings per share (in shares)									117	40	44
Restricted Stock
Earnings per share:
Stock options excluded from diluted earnings per share (in shares)									99	4	26

Share-Based Payments (Details)

Share-Based Payments (Details) - USD ($)	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2013	Jan. 31, 2012
Share-based Compensation Arrangement, Restricted Stock Awards [Abstract]
Share-based expense	$ 32,000,000	$ 27,700,000	$ 18,200,000
$40.01 - $100.00 (average life - 5 years)
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Range of option exercise prices: Number of Shares, Outstanding	100,000
Range of option exercise prices: Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 61.59
Range of option exercise prices: Number of Shares, Exercisable	100,000
Range of option exercise prices: Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 61.59
$100.01 - $160.00 (average life - 6.7 years)
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Range of option exercise prices: Number of Shares, Outstanding	100,000
Range of option exercise prices: Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 121.77
Range of option exercise prices: Number of Shares, Exercisable	100,000
Range of option exercise prices: Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 117.73
$160.01 - $210.00 (average life - 8.2 years)
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Range of option exercise prices: Number of Shares, Outstanding	100,000
Range of option exercise prices: Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 207.80
Range of option exercise prices: Number of Shares, Exercisable	0
Range of option exercise prices: Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 207.80
$210.01 - $239.76 (average life - 9.1 years)
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Range of option exercise prices: Number of Shares, Outstanding	0
Range of option exercise prices: Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 239.76
Range of option exercise prices: Number of Shares, Exercisable	0
Range of option exercise prices: Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant	1,400,000	1,600,000	1,800,000
Weighted Average Grant Date Fair Value Per Share [Roll Forward]
Unrecognized compensation cost	$ 4,800,000
Unrecognized compensation cost period of recognition (years)	1 year 3 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Dividend yield	0.20%	0.30%	0.40%
Expected volatility	28.50%	30.70%	33.90%
Risk-free interest rate	1.30%	1.40%	1.50%
Expected life of options	4 years	4 years	4 years
Weighted-average fair value of options (in dollars per share)	$ 57.40	$ 52.83	$ 37.43
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning of period, Outstanding, Number of Shares	300,000	500,000	700,000
Granted, Number of Shares	0	100,000	100,000
Stock options exercised (shares)	0	(300,000)	(300,000)
End of period, Outstanding, Number of Shares	300,000	300,000	500,000	700,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Beginning of period, Outstanding, Weighted average exercise price (in dollars per share)	$ 129.85	$ 71.95	$ 50.58
Granted, Weighted average exercise price (in dollars per share)	239.76	207.80	135.63
Exercised, Weighted average exercise price (in dollars per share)	139.69	51.34	39.35
End of period, Outstanding, Weighted average exercise price (in dollars per share)	$ 156.43	$ 129.85	$ 71.95	$ 50.58
Exercisable, Number of shares outstanding (shares)	200,000	100,000	300,000	500,000
Exercisable, Weighted average exercise price (in dollars per share)	$ 106.54	$ 83.89	$ 51.05	$ 41.05
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Total intrinsic value of stock options expected to vest	$ 1,300,000	$ 50,000,000	$ 33,300,000
Total intrinsic value of stock options exercised	13,600,000
Total intrinsic value of stock options outstanding	13,600,000
Total intrinsic value of stock options exercisable	$ 12,600,000
Stock Options | $40.01 - $100.00 (average life - 5 years)
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Range of option exercise prices: lower range limit (in dollars per share)	$ 40.01
Range of option exercise prices: upper range limit (in dollars per share)	$ 100
Range of option exercise prices: average life	5 years
Stock Options | $100.01 - $160.00 (average life - 6.7 years)
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Range of option exercise prices: lower range limit (in dollars per share)	$ 100.01
Range of option exercise prices: upper range limit (in dollars per share)	$ 160
Range of option exercise prices: average life	6 years 8 months 12 days
Stock Options | $160.01 - $210.00 (average life - 8.2 years)
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Range of option exercise prices: lower range limit (in dollars per share)	$ 160.01
Range of option exercise prices: upper range limit (in dollars per share)	$ 210
Range of option exercise prices: average life	8 years 2 months 12 days
Stock Options | $210.01 - $239.76 (average life - 9.1 years)
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Range of option exercise prices: lower range limit (in dollars per share)	$ 210.01
Range of option exercise prices: upper range limit (in dollars per share)	$ 239.76
Range of option exercise prices: average life	9 years 1 month
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning of period, Outstanding, Number of Shares	400,000
Granted, Number of Shares	100,000
Vested, Number of Shares	(100,000)
End of period, Outstanding, Number of Shares	400,000	400,000
Weighted Average Grant Date Fair Value Per Share [Roll Forward]
Beginning of period, Outstanding, Weighted Average Grant date Fair Value Per Share (in dollars per share)	$ 159.50
Granted, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	239.59
Vested, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	138.50
End of period, Outstanding, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 197.41	$ 159.50
Unrecognized compensation cost	$ 54,400,000
Unrecognized compensation cost period of recognition (years)	1 year 8 months 12 days
Total fair value of shares vested	$ 24,800,000	$ 18,800,000	14,300,000
Amended and Restated Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance (shares)	2,300,000
Number of shares available for grant with shareholders approval (shares)	1,700,000
Amended Plan | Stock Options
Share-based Compensation Arrangement, Restricted Stock Awards [Abstract]
Share-based compensation vesting period (years)	3 years
Share-based expense	$ 3,600,000	2,900,000	2,400,000
Share-based Compensation Arrangement, Stock Options [Abstract]
Share-based compensation, expiration period	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
End of period, Outstanding, Number of Shares	322,000
Amended Plan | Restricted Stock
Share-based Compensation Arrangement, Restricted Stock Awards [Abstract]
Share-based compensation vesting period (years)	4 years
Share-based expense	$ 27,200,000	$ 23,700,000	$ 14,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
End of period, Outstanding, Number of Shares	384,000
Directors' Deferred Compensation Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant with shareholders approval (shares)						86,000
Number of shares available for grant	390,000	400,000	400,000			300,000
Share-based Compensation Arrangement, Restricted Stock Awards [Abstract]
Share-based expense	$ 1,200,000	$ 1,100,000	$ 1,000,000
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Deferred compensation, number of share units outstanding	132,000
Deferred compensation, deferral percentage of annual retainer				55.00%	50.00%
Supplemental Deferred Savings Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement, Restricted Stock Awards [Abstract]
Share-based expense	$ 0	$ 0	$ 0
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Deferred compensation, number of share units outstanding	9,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance (shares)	1,500,000
Number of shares available for grant	1,000,000
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Employee discount on purchases of common stock	5.00%

Commitments and Contingencies60

Commitments and Contingencies (Details) - USD ($)	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Minimum lease payments under noncancelable lease for fiscal 2018	$ 16,200,000
Minimum lease payments under noncancelable lease for fiscal 2019	14,000,000
Minimum lease payments under noncancelable lease for fiscal 2020	11,900,000
Minimum lease payments under noncancelable lease for fiscal 2021	9,600,000
Minimum lease payments under noncancelable lease for fiscal 2022	6,200,000
Minimum lease payments under noncancelable lease for fiscal year after 2022	11,400,000
Operating Leases, Rent Expense, Net [Abstract]
Total rent expense	20,000,000	$ 17,600,000	$ 16,000,000
Recorded Unconditional Purchase Obligation, Fiscal Year Maturity Schedule [Abstract]
Purchase obligations in fiscal 2018	238,700,000
Purchase obligations due beyond fiscal 2018	$ 0
Standard product warranty period	5 years
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Beginning balance	$ 15,500,000	9,600,000	8,500,000
Warranty and recall costs	41,100,000	25,700,000	16,100,000
Payments and other deductions	(33,300,000)	(20,800,000)	(15,000,000)
Acquired warranty and recall liabilities	0	1,000,000	0
Ending balance	$ 23,300,000	$ 15,500,000	$ 9,600,000
Total work force covered by collective bargaining agreements
Recorded Unconditional Purchase Obligation, Fiscal Year Maturity Schedule [Abstract]
Collective bargaining agreements, percentage of work force	76.00%
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year
Recorded Unconditional Purchase Obligation, Fiscal Year Maturity Schedule [Abstract]
Collective bargaining agreements, percentage of work force	56.00%

Special Charge (Details)

Special Charge (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Restructuring Cost and Reserve [Line Items]
Special charge	$ 11.3	$ 15	$ 12.4
Restructuring Reserve [Roll Forward]
Remaining balance of severance reserve	6.6
Payments made during the period	(6.3)
Remaining balance of severance reserve	12.6	6.6
Special Charges
Restructuring Cost and Reserve [Line Items]
Special charge	11.3	15
Severance and employee-related costs
Restructuring Reserve [Roll Forward]
Incurred costs	11.2
Severance and employee-related costs | Special Charges
Restructuring Cost and Reserve [Line Items]
Special charge	11.2	9.9
Lease termination and other costs
Restructuring Reserve [Roll Forward]
Incurred costs	1.1
Lease termination and other costs | Special Charges
Restructuring Cost and Reserve [Line Items]
Special charge	0.1	5.1
Fiscal 2017 Actions
Restructuring Reserve [Roll Forward]
Remaining balance of severance reserve	0
Payments made during the period	(1)
Remaining balance of severance reserve	11.2	0
Fiscal 2017 Actions | Severance and employee-related costs
Restructuring Reserve [Roll Forward]
Incurred costs	12.2
Fiscal 2017 Actions | Lease termination and other costs
Restructuring Reserve [Roll Forward]
Incurred costs	0
Fiscal 2016 Actions
Restructuring Reserve [Roll Forward]
Remaining balance of severance reserve	6.4
Payments made during the period	(5.1)
Remaining balance of severance reserve	1.4	6.4
Fiscal 2016 Actions | Severance and employee-related costs
Restructuring Reserve [Roll Forward]
Incurred costs	(1)
Fiscal 2016 Actions | Lease termination and other costs
Restructuring Reserve [Roll Forward]
Incurred costs	1.1
Fiscal 2015 Actions
Restructuring Reserve [Roll Forward]
Remaining balance of severance reserve	0.2
Payments made during the period	(0.2)
Remaining balance of severance reserve	0	$ 0.2
Fiscal 2015 Actions | Severance and employee-related costs
Restructuring Reserve [Roll Forward]
Incurred costs	0
Fiscal 2015 Actions | Lease termination and other costs
Restructuring Reserve [Roll Forward]
Incurred costs	$ 0

Income Taxes - Provision for In

Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Income Tax Disclosure [Abstract]
Provision for current federal taxes	$ 151.2	$ 139.6	$ 101.5
Provision for current state taxes	20.4	17.6	13.1
Provision for current foreign taxes	7	5.1	4.3
(Benefit) provision for deferred taxes	(7.7)	(8.5)	2.6
Total provision for income taxes	$ 170.9	$ 153.8	$ 121.5

Income Taxes (Details)

Income Taxes (Details) - USD ($)	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Federal income tax computed at statutory rate	$ 172,400,000	$ 155,600,000	$ 120,300,000
State income tax, net of federal income tax benefit	12,200,000	11,000,000	8,600,000
Foreign permanent differences and rate differential	(1,600,000)	(2,000,000)	(1,400,000)
Other, net	(12,100,000)	(10,800,000)	(6,000,000)
Total provision for income taxes	170,900,000	153,800,000	121,500,000
Deferred income tax liabilities:
Depreciation	(20,000,000)	(22,500,000)
Goodwill and intangibles	(194,900,000)	(161,600,000)
Other liabilities	(4,000,000)	(3,700,000)
Total deferred income tax liabilities	(218,900,000)	(187,800,000)
Deferred income tax assets:
Self-insurance	4,100,000	4,000,000
Pension	33,700,000	41,700,000
Deferred compensation	32,900,000	28,900,000
Net operating losses	13,700,000	14,300,000
Other accruals not yet deductible	33,300,000	33,500,000
Other assets	10,600,000	12,300,000
Total deferred income tax assets	128,300,000	134,700,000
Valuation allowance	(14,200,000)	(16,400,000)
Net deferred income tax liabilities	(104,800,000)	(69,500,000)
Undistributed earnings and original investments in foreign subsidiaries	96,700,000
State tax credit carryforwards	900,000
Unrecognized tax benefits that if recognized would affect annual effective tax rate	4,400,000	3,900,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits balance at beginning of year	5,200,000	4,500,000
Additions based on tax positions related to the current year	1,200,000	1,000,000
Additions for tax positions of prior years	400,000	500,000
Reductions due to lapse of statute of limitations	(800,000)	(800,000)
Unrecognized tax benefits balance at end of year	6,000,000	5,200,000	$ 4,500,000
Total accrued interest	1,000,000	$ 900,000
Accruals related to income tax penalties	0
Internal Revenue Service (IRS)
Deferred income tax assets:
Operating loss carryforwards	23,300,000
State and Local Jurisdiction
Deferred income tax assets:
Operating loss carryforwards	9,900,000
Foreign Tax Authority
Deferred income tax assets:
Operating loss carryforwards	$ 21,200,000

Supplemental Disaggregated In64

Supplemental Disaggregated Information (Details) $ in Millions	3 Months Ended								12 Months Ended
	Aug. 31, 2017USD ($)	May 31, 2017USD ($)	Feb. 28, 2017USD ($)	Nov. 30, 2016USD ($)	Aug. 31, 2016USD ($)	May 31, 2016USD ($)	Feb. 29, 2016USD ($)	Nov. 30, 2015USD ($)	Aug. 31, 2017USD ($)Segment	Aug. 31, 2016USD ($)	Aug. 31, 2015USD ($)
Geographic Distribution
Number of reportable segments | Segment									1
Net sales	$ 957.6	$ 891.6	$ 804.7	$ 851.2	$ 925.5	$ 851.5	$ 777.8	$ 736.6	$ 3,505.1	$ 3,291.3	$ 2,706.7
Operating profit:									518.8	475.2	376.3
Income before provision for income taxes:									492.6	444.6	343.6
Long-lived assets	304.3				295.9				304.3	295.9	205.2
Domestic
Geographic Distribution
Net sales									3,123.1	2,928.3	2,450.1
Operating profit:									497.5	457.6	364
Income before provision for income taxes:									478.5	430.8	329.4
Long-lived assets	252.8				254.5				252.8	254.5	179.6
International
Geographic Distribution
Net sales									382	363	256.6
Operating profit:									21.3	17.6	12.3
Income before provision for income taxes:									14.1	13.8	14.2
Long-lived assets	$ 51.5				$ 41.4				$ 51.5	$ 41.4	$ 25.6
Sales of lighting solutions, excluding services | Product Concentration Risk
Geographic Distribution
Sales as percentage of total sales (percent)									99.00%	99.00%	99.00%

Supplemental Guarantor Conden65

Supplemental Guarantor Condensed Consolidating Financial Statements - Balance Sheets (Details) - USD ($) $ in Millions	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014
Current assets:
Cash and cash equivalents	$ 311.1	$ 413.2	$ 756.8	$ 552.5
Accounts receivable, net	573.3	572.8
Inventories	328.6	295.2
Other current assets	32.6	41.7
Total current assets	1,245.6	1,322.9
Property, plant, and equipment, net	287.7	267.8
Goodwill	900.9	947.8
Intangible assets, net	448.8	381.4
Deferred income taxes	3.4	5.1
Other long-term assets	13.2	23
Investments in and amounts due from affiliates	0	0
Total assets	2,899.6	2,948
Current liabilities:
Accounts payable	395.1	401
Current maturities of long-term debt	0.4	0.2
Accrued liabilities	205.4	271.3
Total current liabilities	600.9	672.5
Long-term debt	356.5	355
Deferred income taxes	108.2	74.6
Other long-term liabilities	168.4	186.1
Amounts due to affiliates	0	0
Total stockholders’ equity	1,665.6	1,659.8	1,360	1,163.5
Total liabilities and stockholders’ equity	2,899.6	2,948
Consolidating Adjustments
Current assets:
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0
Inventories	0	0
Other current assets	0	0
Total current assets	0	0
Property, plant, and equipment, net	0	0
Goodwill	0	0
Intangible assets, net	0	0
Deferred income taxes	(56.2)	(48.9)
Other long-term assets	0	0
Investments in and amounts due from affiliates	(2,064.9)	(1,847.7)
Total assets	(2,121.1)	(1,896.6)
Current liabilities:
Accounts payable	0	0
Current maturities of long-term debt	0	0
Accrued liabilities	0	0
Total current liabilities	0	0
Long-term debt	0	0
Deferred income taxes	(56.2)	(48.9)
Other long-term liabilities	0	0
Amounts due to affiliates	(128.8)	(96.9)
Total stockholders’ equity	(1,936.1)	(1,750.8)
Total liabilities and stockholders’ equity	(2,121.1)	(1,896.6)
Parent
Current assets:
Cash and cash equivalents	237.7	368.2	479.9	516
Accounts receivable, net	0	0
Inventories	0	0
Other current assets	1.6	2.5
Total current assets	239.3	370.7
Property, plant, and equipment, net	0.2	0.3
Goodwill	0	0
Intangible assets, net	0	0
Deferred income taxes	51.6	47.5
Other long-term assets	1.5	1.4
Investments in and amounts due from affiliates	1,500.3	1,347.6
Total assets	1,792.9	1,767.5
Current liabilities:
Accounts payable	0.9	1.2
Current maturities of long-term debt	0	0
Accrued liabilities	27.6	14.5
Total current liabilities	28.5	15.7
Long-term debt	0	0
Deferred income taxes	0	0
Other long-term liabilities	98.7	92
Amounts due to affiliates	0	0
Total stockholders’ equity	1,665.7	1,659.8
Total liabilities and stockholders’ equity	1,792.9	1,767.5
Subsidiary Guarantor
Current assets:
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0
Inventories	0	0
Other current assets	0	0
Total current assets	0	0
Property, plant, and equipment, net	0	0
Goodwill	2.7	2.7
Intangible assets, net	109.8	113.4
Deferred income taxes	0	0
Other long-term assets	0	0
Investments in and amounts due from affiliates	234.2	200.5
Total assets	346.7	316.6
Current liabilities:
Accounts payable	0	0
Current maturities of long-term debt	0	0
Accrued liabilities	0	0
Total current liabilities	0	0
Long-term debt	0	0
Deferred income taxes	0	0
Other long-term liabilities	0	0
Amounts due to affiliates	0	0
Total stockholders’ equity	346.7	316.6
Total liabilities and stockholders’ equity	346.7	316.6
Non- Guarantors
Current assets:
Cash and cash equivalents	73.4	45	276.9	33.4
Accounts receivable, net	78.7	69.8
Inventories	23.1	20.5
Other current assets	15.2	24.9
Total current assets	190.4	160.2
Property, plant, and equipment, net	59.2	49.7
Goodwill	220.5	209.3
Intangible assets, net	103.5	99.9
Deferred income taxes	8	6.5
Other long-term assets	0.8	1.2
Investments in and amounts due from affiliates	0	0
Total assets	582.4	526.8
Current liabilities:
Accounts payable	27.8	28.5
Current maturities of long-term debt	0.4	0.2
Accrued liabilities	38.9	41.4
Total current liabilities	67.1	70.1
Long-term debt	3.4	2.2
Deferred income taxes	29.8	28
Other long-term liabilities	20.4	29.3
Amounts due to affiliates	128.8	96.9
Total stockholders’ equity	332.9	300.3
Total liabilities and stockholders’ equity	582.4	526.8
Subsidiary Issuer
Current assets:
Cash and cash equivalents	0	0	$ 0	$ 3.1
Accounts receivable, net	494.6	503
Inventories	305.5	274.7
Other current assets	15.8	14.3
Total current assets	815.9	792
Property, plant, and equipment, net	228.3	217.8
Goodwill	677.7	735.8
Intangible assets, net	235.5	168.1
Deferred income taxes	0	0
Other long-term assets	10.9	20.4
Investments in and amounts due from affiliates	330.4	299.6
Total assets	2,298.7	2,233.7
Current liabilities:
Accounts payable	366.4	371.3
Current maturities of long-term debt	0	0
Accrued liabilities	138.9	215.4
Total current liabilities	505.3	586.7
Long-term debt	353.1	352.8
Deferred income taxes	134.6	95.5
Other long-term liabilities	49.3	64.8
Amounts due to affiliates	0	0
Total stockholders’ equity	1,256.4	1,133.9
Total liabilities and stockholders’ equity	$ 2,298.7	$ 2,233.7

Supplemental Guarantor Conden66

Supplemental Guarantor Condensed Consolidating Financial Statements - Income Statement (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Net sales:
External sales									$ 3,505.1	$ 3,291.3	$ 2,706.7
Intercompany sales									0	0	0
Total sales	$ 957.6	$ 891.6	$ 804.7	$ 851.2	$ 925.5	$ 851.5	$ 777.8	$ 736.6	3,505.1	3,291.3	2,706.7
Cost of products sold									2,023.9	1,855.1	1,561.1
Gross profit	406.9	378.9	335.8	359.6	402.1	377.9	336.9	319.4	1,481.2	1,436.2	1,145.6
Selling, distribution, and administrative expenses									951.1	946	756.9
Intercompany charges									0	0	0
Special charge									11.3	15	12.4
Operating profit									518.8	475.2	376.3
Interest expense (income), net									32.5	32.2	31.5
Equity earnings in subsidiaries									0	0	0
Miscellaneous (income) expense, net									(6.3)	(1.6)	1.2
Income before provision for income taxes									492.6	444.6	343.6
Provision (benefit) for income taxes									170.9	153.8	121.5
Net income	$ 90.5	$ 82.2	$ 67.3	$ 81.7	$ 82.9	$ 74	$ 65.5	$ 68.4	321.7	290.8	222.1
Other comprehensive income (loss) items:
Foreign currency translation adjustments									19	(5.6)	(24)
Defined benefit plans, net									20.7	(23.4)	(14.5)
Other comprehensive income (loss) items, net of tax									39.7	(29)	(38.5)
Comprehensive income									361.4	261.8	183.6
Consolidating Adjustments
Net sales:
External sales									0	0	0
Intercompany sales									(228.6)	(178.6)	(146.7)
Total sales									(228.6)	(178.6)	(146.7)
Cost of products sold									(173.4)	(126.4)	(103.4)
Gross profit									(55.2)	(52.2)	(43.3)
Selling, distribution, and administrative expenses									(55.1)	(52.2)	(43.3)
Intercompany charges									0	0	0
Special charge									0	0	0
Operating profit									(0.1)	0	0
Interest expense (income), net									0	0	0
Equity earnings in subsidiaries									328.4	292.2	226.4
Miscellaneous (income) expense, net									0	0	0
Income before provision for income taxes									(328.5)	(292.2)	(226.4)
Provision (benefit) for income taxes									0	0	0
Net income									(328.5)	(292.2)	(226.4)
Other comprehensive income (loss) items:
Foreign currency translation adjustments									(19)	5.6	24
Defined benefit plans, net									(19.3)	20.9	(6.8)
Other comprehensive income (loss) items, net of tax									(38.3)	26.5	17.2
Comprehensive income									(366.8)	(265.7)	(209.2)
Parent
Net sales:
External sales									0	0	0
Intercompany sales									0	0	0
Total sales									0	0	0
Cost of products sold									0	0	0
Gross profit									0	0	0
Selling, distribution, and administrative expenses									45	47.2	34
Intercompany charges									(56.9)	(59.5)	(45.4)
Special charge									0	0	0
Operating profit									11.9	12.3	11.4
Interest expense (income), net									11	10.5	9.9
Equity earnings in subsidiaries									(320.9)	(289.2)	(221.2)
Miscellaneous (income) expense, net									0	0	0
Income before provision for income taxes									321.8	291	222.7
Provision (benefit) for income taxes									0.1	0.2	0.6
Net income									321.7	290.8	222.1
Other comprehensive income (loss) items:
Foreign currency translation adjustments									19	(5.6)	(24)
Defined benefit plans, net									20.7	(23.4)	(14.5)
Other comprehensive income (loss) items, net of tax									39.7	(29)	(38.5)
Comprehensive income									361.4	261.8	183.6
Subsidiary Guarantor
Net sales:
External sales									0	0	0
Intercompany sales									49.4	47.4	41.2
Total sales									49.4	47.4	41.2
Cost of products sold									0	0	0
Gross profit									49.4	47.4	41.2
Selling, distribution, and administrative expenses									3.6	3.8	4
Intercompany charges									0	0	0
Special charge									0	0	0
Operating profit									45.8	43.6	37.2
Interest expense (income), net									0	0	0
Equity earnings in subsidiaries									0	0	0
Miscellaneous (income) expense, net									0	0	0
Income before provision for income taxes									45.8	43.6	37.2
Provision (benefit) for income taxes									15.7	15.6	14.9
Net income									30.1	28	22.3
Other comprehensive income (loss) items:
Foreign currency translation adjustments									0	0	0
Defined benefit plans, net									0	0	0
Other comprehensive income (loss) items, net of tax									0	0	0
Comprehensive income									30.1	28	22.3
Non- Guarantors
Net sales:
External sales									399.9	371.6	259.8
Intercompany sales									179.2	131.2	105.5
Total sales									579.1	502.8	365.3
Cost of products sold									432.8	379.3	276.5
Gross profit									146.3	123.5	88.8
Selling, distribution, and administrative expenses									132.8	112.6	77.8
Intercompany charges									9.2	9.1	5.7
Special charge									0	0	0
Operating profit									4.3	1.8	5.3
Interest expense (income), net									5.4	5.6	(0.2)
Equity earnings in subsidiaries									0.2	0.2	0
Miscellaneous (income) expense, net									1.7	(1.6)	(1.6)
Income before provision for income taxes									(3)	(2.4)	7.1
Provision (benefit) for income taxes									(2.9)	0.3	2.5
Net income									(0.1)	(2.7)	4.6
Other comprehensive income (loss) items:
Foreign currency translation adjustments									0	0	0
Defined benefit plans, net									7.5	(9.5)	0.5
Other comprehensive income (loss) items, net of tax									7.5	(9.5)	0.5
Comprehensive income									7.4	(12.2)	5.1
Subsidiary Issuer
Net sales:
External sales									3,105.2	2,919.7	2,446.9
Intercompany sales									0	0	0
Total sales									3,105.2	2,919.7	2,446.9
Cost of products sold									1,764.5	1,602.2	1,388
Gross profit									1,340.7	1,317.5	1,058.9
Selling, distribution, and administrative expenses									824.8	834.6	684.4
Intercompany charges									47.7	50.4	39.7
Special charge									11.3	15	12.4
Operating profit									456.9	417.5	322.4
Interest expense (income), net									16.1	16.1	21.8
Equity earnings in subsidiaries									(7.7)	(3.2)	(5.2)
Miscellaneous (income) expense, net									(8)	0	2.8
Income before provision for income taxes									456.5	404.6	303
Provision (benefit) for income taxes									158	137.7	103.5
Net income									298.5	266.9	199.5
Other comprehensive income (loss) items:
Foreign currency translation adjustments									19	(5.6)	(24)
Defined benefit plans, net									11.8	(11.4)	6.3
Other comprehensive income (loss) items, net of tax									30.8	(17)	(17.7)
Comprehensive income									$ 329.3	$ 249.9	$ 181.8

Supplemental Guarantor Conden67

Supplemental Guarantor Condensed Consolidating Financial Statements - Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Condensed Financial Statements of Cash Flows
Net cash provided by operating activities	$ 316.2	$ 345.7	$ 288.9
Cash flows from investing activities:
Purchases of property, plant, and equipment	(67.3)	(83.7)	(56.5)
Proceeds from sale of property, plant, and equipment	5.5	2.2	1.3
Investments in subsidiaries		0	0
Acquisitions of businesses and intangible assets	0	(623.2)	(14.6)
Proceeds from sale of investment in unconsolidated affiliate	13.2	0	0
Other investing activities	(0.2)	0	(2.6)
Net cash used for investing activities	(48.8)	(704.7)	(72.4)
Cash flow from financing activities:
Issuance of long-term debt	1	2.5	0
Proceeds from stock option exercises and other	3	14.2	11.6
Repurchases of common stock	(357.9)	0	0
Excess tax benefits from share-based payments	5.2	25.6	17.6
Intercompany capital		0	0
Dividends paid	(22.7)	(22.9)	(22.7)
Other financing activities	0	0	(10.4)
Net cash (used for) provided by financing activities	(371.4)	19.4	(3.9)
Effect of exchange rate changes on cash	1.9	(4)	(8.3)
Net change in cash and cash equivalents	(102.1)	(343.6)	204.3
Cash and cash equivalents at beginning of year	413.2	756.8	552.5
Cash and cash equivalents at end of year	311.1	413.2	756.8
Consolidating Adjustments
Condensed Financial Statements of Cash Flows
Net cash provided by operating activities	0	0	0
Cash flows from investing activities:
Purchases of property, plant, and equipment	0	0	0
Proceeds from sale of property, plant, and equipment	0	0	0
Investments in subsidiaries		405.6	499.9
Acquisitions of businesses and intangible assets		0	0
Proceeds from sale of investment in unconsolidated affiliate	0
Other investing activities	0		0
Net cash used for investing activities	0	405.6	499.9
Cash flow from financing activities:
Issuance of long-term debt	0	0
Proceeds from stock option exercises and other	0	0	0
Repurchases of common stock	0
Excess tax benefits from share-based payments	0	0	0
Intercompany capital		(405.6)	(499.9)
Dividends paid	0	0	0
Other financing activities			0
Net cash (used for) provided by financing activities	0	(405.6)	(499.9)
Effect of exchange rate changes on cash	0	0	0
Net change in cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of year	0	0	0
Cash and cash equivalents at end of year	0	0	0
Parent
Condensed Financial Statements of Cash Flows
Net cash provided by operating activities	241.9	277	212.1
Cash flows from investing activities:
Purchases of property, plant, and equipment	0	0	0
Proceeds from sale of property, plant, and equipment	0	0	0
Investments in subsidiaries		(405.6)	(254.7)
Acquisitions of businesses and intangible assets		0	0
Proceeds from sale of investment in unconsolidated affiliate	0
Other investing activities	0		0
Net cash used for investing activities	0	(405.6)	(254.7)
Cash flow from financing activities:
Issuance of long-term debt	0	0
Proceeds from stock option exercises and other	3	14.2	11.6
Repurchases of common stock	(357.9)
Excess tax benefits from share-based payments	5.2	25.6	17.6
Intercompany capital		0	0
Dividends paid	(22.7)	(22.9)	(22.7)
Other financing activities			0
Net cash (used for) provided by financing activities	(372.4)	16.9	6.5
Effect of exchange rate changes on cash	0	0	0
Net change in cash and cash equivalents	(130.5)	(111.7)	(36.1)
Cash and cash equivalents at beginning of year	368.2	479.9	516
Cash and cash equivalents at end of year	237.7	368.2	479.9
Subsidiary Guarantor
Condensed Financial Statements of Cash Flows
Net cash provided by operating activities	0	0	0
Cash flows from investing activities:
Purchases of property, plant, and equipment	0	0	0
Proceeds from sale of property, plant, and equipment	0	0	0
Investments in subsidiaries		0	0
Acquisitions of businesses and intangible assets		0	0
Proceeds from sale of investment in unconsolidated affiliate	0
Other investing activities	0		0
Net cash used for investing activities	0	0	0
Cash flow from financing activities:
Issuance of long-term debt	0	0
Proceeds from stock option exercises and other	0	0	0
Repurchases of common stock	0
Excess tax benefits from share-based payments	0	0	0
Intercompany capital		0	0
Dividends paid	0	0	0
Other financing activities			0
Net cash (used for) provided by financing activities	0	0	0
Effect of exchange rate changes on cash	0	0	0
Net change in cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of year	0	0	0
Cash and cash equivalents at end of year	0	0	0
Non- Guarantors
Condensed Financial Statements of Cash Flows
Net cash provided by operating activities	32.9	13.9	21.6
Cash flows from investing activities:
Purchases of property, plant, and equipment	(14.2)	(16.6)	(14.6)
Proceeds from sale of property, plant, and equipment	5.3	2	0
Investments in subsidiaries		0	0
Acquisitions of businesses and intangible assets		(229.3)	0
Proceeds from sale of investment in unconsolidated affiliate	0
Other investing activities	0		0
Net cash used for investing activities	(8.9)	(243.9)	(14.6)
Cash flow from financing activities:
Issuance of long-term debt	1	2.5
Proceeds from stock option exercises and other	0	0	0
Repurchases of common stock	0
Excess tax benefits from share-based payments	0	0	0
Intercompany capital		0	254.7
Dividends paid	0	0	0
Other financing activities			(10.4)
Net cash (used for) provided by financing activities	1	2.5	244.3
Effect of exchange rate changes on cash	3.4	(4.4)	(7.8)
Net change in cash and cash equivalents	28.4	(231.9)	243.5
Cash and cash equivalents at beginning of year	45	276.9	33.4
Cash and cash equivalents at end of year	73.4	45	276.9
Subsidiary Issuer
Condensed Financial Statements of Cash Flows
Net cash provided by operating activities	41.4	54.8	55.2
Cash flows from investing activities:
Purchases of property, plant, and equipment	(53.1)	(67.1)	(41.9)
Proceeds from sale of property, plant, and equipment	0.2	0.2	1.3
Investments in subsidiaries		0	(245.2)
Acquisitions of businesses and intangible assets		(393.9)	(14.6)
Proceeds from sale of investment in unconsolidated affiliate	13.2
Other investing activities	(0.2)		(2.6)
Net cash used for investing activities	(39.9)	(460.8)	(303)
Cash flow from financing activities:
Issuance of long-term debt	0	0
Proceeds from stock option exercises and other	0	0	0
Repurchases of common stock	0
Excess tax benefits from share-based payments	0	0	0
Intercompany capital		405.6	245.2
Dividends paid	0	0	0
Other financing activities			0
Net cash (used for) provided by financing activities	0	405.6	245.2
Effect of exchange rate changes on cash	(1.5)	0.4	(0.5)
Net change in cash and cash equivalents	0	0	(3.1)
Cash and cash equivalents at beginning of year	0	0	3.1
Cash and cash equivalents at end of year	$ 0	$ 0	$ 0

Quarterly Financial Data (Una68

Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 957.6	$ 891.6	$ 804.7	$ 851.2	$ 925.5	$ 851.5	$ 777.8	$ 736.6	$ 3,505.1	$ 3,291.3	$ 2,706.7
Gross profit	406.9	378.9	335.8	359.6	402.1	377.9	336.9	319.4	1,481.2	1,436.2	1,145.6
Net income	$ 90.5	$ 82.2	$ 67.3	$ 81.7	$ 82.9	$ 74	$ 65.5	$ 68.4	$ 321.7	$ 290.8	$ 222.1
Basic earnings per share (in dollars per share)	$ 2.16	$ 1.91	$ 1.54	$ 1.87	$ 1.90	$ 1.70	$ 1.50	$ 1.58	$ 7.46	$ 6.67	$ 5.13
Diluted earnings per share (in dollars per share)	$ 2.15	$ 1.90	$ 1.53	$ 1.86	$ 1.89	$ 1.69	$ 1.49	$ 1.57	$ 7.43	$ 6.63	$ 5.09

Schedule II - Valuation and Q69

Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Reserve for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance at Beginning of Year	$ 1.7	$ 1.3	$ 1.9
Valuation Allowances and Reserves, Charged to Cost and Expense	0.3	0.3	0.1
Valuation Allowances and Reserves, Charged to Other Accounts	0.1	0.4	0
Valuation Allowances and Reserves, Deductions	0.2	0.3	0.7
Valuation Allowances and Reserves, Balance at End of Year	1.9	1.7	1.3
Reserve for estimated product returns, net
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance at Beginning of Year	10.9	6.2	4.3
Valuation Allowances and Reserves, Charged to Cost and Expense	84.7	62.6	44.7
Valuation Allowances and Reserves, Charged to Other Accounts	0	0.9	0
Valuation Allowances and Reserves, Deductions	82	58.8	42.8
Valuation Allowances and Reserves, Balance at End of Year	13.6	10.9	6.2
Reserve for estimated cash discounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance at Beginning of Year	4.7	3	2.7
Valuation Allowances and Reserves, Charged to Cost and Expense	29	32	21.7
Valuation Allowances and Reserves, Charged to Other Accounts	0	0.9	0
Valuation Allowances and Reserves, Deductions	29.6	31.2	21.4
Valuation Allowances and Reserves, Balance at End of Year	4.1	4.7	3
Reserve for estimated other deductions
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance at Beginning of Year	1.7	1.3	1.3
Valuation Allowances and Reserves, Charged to Cost and Expense	20.5	11.9	9.1
Valuation Allowances and Reserves, Charged to Other Accounts	0	0	0
Valuation Allowances and Reserves, Deductions	18.6	11.5	9.1
Valuation Allowances and Reserves, Balance at End of Year	3.6	1.7	1.3
Deferred tax asset valuation allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance at Beginning of Year	16.4	15	13.6
Valuation Allowances and Reserves, Charged to Cost and Expense	1.5	(0.2)	(0.4)
Valuation Allowances and Reserves, Charged to Other Accounts	(0.6)	1.6	1.8
Valuation Allowances and Reserves, Deductions	3.1	0	0
Valuation Allowances and Reserves, Balance at End of Year	$ 14.2	$ 16.4	$ 15