PTC (PTC) 10-Q 1 Aug 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Jun. 30, 2018	Jul. 27, 2018
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Entity Registrant Name	PTC Inc.
Entity Central Index Key	857,005
Current Fiscal Year End Date	--09-30
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		117,829,713

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
ASSETS
Cash and cash equivalents	$ 266,552	$ 280,003
Short-term marketable securities	22,356	18,408
Accounts receivable, net of allowance for doubtful accounts of $591 and $1,062 at June 30, 2018 and September 30, 2017, respectively	130,079	152,299
Prepaid expenses	46,600	49,913
Other current assets	122,625	165,933
Total current assets	588,212	666,556
Property and equipment, net	64,456	63,600
Goodwill	1,182,462	1,182,772
Acquired intangible assets, net	214,657	257,908
Long-term marketable securities	31,816	31,907
Deferred tax assets	138,958	123,166
Other assets	35,070	34,475
Total assets	2,255,631	2,360,384
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	37,773	35,160
Accrued expenses and other current liabilities	58,296	80,761
Accrued compensation and benefits	87,401	110,957
Accrued income taxes	6,683	5,735
Deferred revenue	474,957	446,296
Total current liabilities	665,110	678,909
Long-term debt	693,053	712,406
Deferred tax liabilities	5,862	17,880
Deferred revenue	8,994	12,611
Other liabilities	48,227	53,142
Total liabilities	1,421,246	1,474,948
Commitments and contingencies (Note 13)
Stockholders’ equity:
Preferred stock, $0.01 par value; 5,000 shares authorized; none issued	0	0
Common stock, $0.01 par value; 500,000 shares authorized; 115,491 and 115,333 shares issued and outstanding at June 30, 2018 and September 30, 2017, respectively	1,155	1,153
Additional paid-in capital	1,524,399	1,609,030
Accumulated deficit	(612,600)	(650,840)
Accumulated other comprehensive loss	(78,569)	(73,907)
Total stockholders’ equity	834,385	885,436
Total liabilities and stockholders’ equity	$ 2,255,631	$ 2,360,384

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Current assets:
Allowance for doubtful accounts	$ 591	$ 1,062
Stockholders’ equity:
Preferred stock, par value (in USD per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	115,491,000	115,333,000
Common stock, shares outstanding	115,491,000	115,333,000

Consolidated Statements Of Oper

Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Revenues [Abstract]
Subscription	$ 126,712	$ 74,859	$ 339,651	$ 195,001
Support	121,127	140,428	379,007	433,624
Total recurring revenue	247,839	215,287	718,658	628,625
Perpetual license	25,780	32,348	82,604	94,099
Total subscription, support and license revenue	273,619	247,635	801,262	722,724
Professional services	41,158	43,658	128,041	134,936
Total revenue	314,777	291,293	929,303	857,660
Cost of revenue:
Cost of license and subscription revenue	24,010	21,648	71,505	62,333
Cost of support revenue	22,223	23,635	67,453	69,028
Total cost of software revenue	46,233	45,283	138,958	131,361
Cost of professional services revenue	35,323	36,985	109,187	114,852
Total cost of revenue	81,556	82,268	248,145	246,213
Gross margin	233,221	209,025	681,158	611,447
Operating expenses:
Sales and marketing	107,741	93,101	305,386	271,568
Research and development	61,218	59,850	187,381	175,474
General and administrative	33,082	35,294	101,439	108,789
Amortization of acquired intangible assets	7,850	7,973	23,566	23,986
Restructuring and other charges, net	1,627	1,551	1,846	8,300
Total operating expenses	211,518	197,769	619,618	588,117
Operating income	21,703	11,256	61,540	23,330
Interest expense	(10,646)	(10,200)	(31,072)	(32,239)
Interest income and other expense, net	(1,086)	(357)	(2,481)	2,049
Income (loss) before income taxes	9,971	699	27,987	(6,860)
Provision (benefit) for income taxes	(7,026)	1,650	(10,809)	4,336
Net income (loss)	$ 16,997	$ (951)	$ 38,796	$ (11,196)
Earnings(loss) per share—Basic (in USD per share)	$ 0.15	$ (0.01)	$ 0.33	$ (0.10)
Earnings(loss) per share—Diluted (in USD per share)	$ 0.14	$ (0.01)	$ 0.33	$ (0.10)
Weighted average shares outstanding—Basic (in shares)	115,774	115,615	115,915	115,511
Weighted average shares outstanding—Diluted (in shares)	117,500	115,615	117,687	115,511

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 16,997	$ (951)	$ 38,796	$ (11,196)
Other comprehensive income (loss), net of tax:
Unrealized hedge gain (loss) arising during the period, net of tax of $0.6 million and $0.3 million in the third quarter of 2018 and 2017, respectively, and $0.1 million and $0 million in the first nine months of 2018 and 2017, respectively	3,910	(2,298)	950	224
Net hedge (gain) loss reclassified into earnings, net of tax of $0 million in both the third quarter of 2018 and 2017, respectively, and $0.3 million and $0.1 million in the first nine months of 2018 and 2017, respectively	242	75	2,327	(777)
Unrealized gain (loss) on hedging instruments	4,152	(2,223)	3,277	(553)
Foreign currency translation adjustment, net of tax of $0 for each period	(21,628)	17,553	(8,859)	3,893
Unrealized gain (loss) on marketable securities, net of tax of $0 for each period	67	21	(379)	(50)
Amortization of net actuarial pension loss included in net income, net of tax of $0.1 million and $0.2 million in the third quarter of 2018 and 2017, respectively, and $0.5 million and $0.7 million in the first nine months of 2018 and 2017, respectively	386	597	1,143	1,687
Change in unamortized pension loss during the period related to changes in foreign currency	884	(1,721)	156	(343)
Other comprehensive income (loss)	(16,139)	14,227	(4,662)	4,634
Comprehensive income (loss)	$ 858	$ 13,276	$ 34,134	$ (6,562)

Consolidated Statements Of Com6

Consolidated Statements Of Comprehensive Income (Loss) (Parenthetical) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Statement of Comprehensive Income [Abstract]
Unrealized hedge gain (loss) arising during the period, tax	$ 600,000	$ 300,000	$ 100,000	$ 0
Net hedge loss reclassified into earnings, tax	0	0	300,000	100,000
Foreign currency translation adjustment, tax	0	0	0	0
Unrealized gain (loss) marketable securities tax	0	0	0	0
Amortization of net actuarial pension loss included in net income, tax	$ 100,000	$ 200,000	$ 500,000	$ 700,000

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017
Cash flows from operating activities:
Net income (loss)	$ 38,796	$ (11,196)
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Depreciation and amortization	65,303	64,187
Stock-based compensation	52,015	56,139
Other non-cash items, net	304	1,536
Changes in operating assets and liabilities, excluding the effects of acquisitions:
Accounts receivable	21,195	34,913
Accounts payable and accrued expenses	(16,539)	2,594
Accrued compensation and benefits	(22,348)	(50,518)
Deferred revenue	82,794	45,985
Accrued income taxes	(30,005)	(17,832)
Other current assets and prepaid expenses	(5,434)	(7,317)
Other noncurrent assets and liabilities	(759)	(16,028)
Net cash provided by operating activities	185,322	102,463
Cash flows from investing activities:
Additions to property and equipment	(18,666)	(19,333)
Purchase of intangible asset	(3,000)	0
Purchases of short- and long-term marketable securities	(18,063)	(14,173)
Proceeds from maturities of short- and long-term marketable securities	13,640	13,440
Acquisitions of businesses, net of cash acquired	(3,000)	(4,960)
Purchases of investments	(1,000)	0
Proceeds from sales of investments	0	15,218
Net cash used by investing activities	(30,089)	(9,808)
Cash flows from financing activities:
Borrowings under credit facility	200,000	150,000
Repayments of borrowings under credit facility	(220,000)	(190,000)
Repurchases of common stock	(100,000)	(34,994)
Proceeds from issuance of common stock	7,472	3,978
Credit facility origination costs	0	(184)
Contingent consideration	(7,750)	(11,054)
Payments of withholding taxes in connection with vesting of stock-based awards	(44,797)	(26,244)
Net cash used in financing activities	(165,075)	(108,498)
Effect of exchange rate changes on cash and cash equivalents	(3,609)	(1,397)
Net increase (decrease) in cash and cash equivalents	(13,451)	(17,240)
Cash and cash equivalents, beginning of period	280,003	277,935
Cash and cash equivalents, end of period	$ 266,552	$ 260,695

Basis of Presentation

Basis of Presentation	9 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation General The accompanying unaudited condensed consolidated financial statements include the accounts of PTC Inc. and its wholly owned subsidiaries and have been prepared by management in accordance with accounting principles generally accepted in the United States of America and in accordance with the rules and regulations of the Securities and Exchange Commission regarding interim financial reporting. Accordingly, they do not include all the information and footnotes required by generally accepted accounting principles for complete financial statements. While we believe that the disclosures presented are adequate in order to make the information not misleading, these unaudited quarterly financial statements should be read in conjunction with our annual consolidated financial statements and related notes included in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017 . In the opinion of management, the accompanying unaudited condensed consolidated financial statements contain all adjustments, consisting only of those of a normal recurring nature, necessary for a fair statement of our financial position, results of operations and cash flows at the dates and for the periods indicated. The September 30, 2017 Consolidated Balance Sheet included herein is derived from our audited consolidated financial statements. Unless otherwise indicated, all references to a year mean our fiscal year, which ends on September 30. Our fiscal quarters end on a Saturday following a thirteen-week calendar, and may result in different quarter end dates year to year. The third quarter of 2018 ended on June 30, 2018 and the third quarter of 2017 ended on July 1, 2017 . The results of operations for the nine months ended June 30, 2018 are not necessarily indicative of the results expected for the remainder of the fiscal year. Reclassifications Effective at the beginning of fiscal 2018, in accordance with the adoption of ASU 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, excess tax benefits are now classified as an operating activity on the statement of cash flows rather than as a financing activity. The prior period excess tax benefits have been reclassified for comparability. Segments In fiscal 2017, we had three operating and reportable segments: (1) the Solutions Group, which included license, subscription, support and cloud services revenue for our core CAD, SLM and PLM products; (2) the IoT Group, which included license, subscription, support and cloud services revenue for our IoT, analytics and augmented reality solutions; and (3) Professional Services, which included consulting, implementation and training revenue. With a change in our organizational structure to streamline our operations, we merged our Solution Group segment with our IoT Group segment and revised the information that our chief executive officer, who is also our chief operating decision maker ("CODM"), regularly reviews for purposes of allocating resources and assessing performance. As a result, effective with the beginning of the first quarter of fiscal 2018, we changed our operating and reportable segments from three to two : (1) Software Products, which includes license, subscription and related support revenue (including updates and technical support) for all our products; and (2) Professional Services, which includes consulting, implementation and training services. Revenue and operating income in Note 10. Segment Information have been reclassified to conform to the current period presentation. Recent Accounting Pronouncements Recently Adopted Accounting Pronouncements Stock Compensation In March 2016, the FASB issued ASU No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. We adopted ASU No. 2016-09 in the first quarter of 2018. Effective with the adoption, stock-based compensation excess tax benefits or deficiencies are reflected in the Consolidated Statements of Operations as a component of the provision for income taxes when the awards vest or are settled. Previously they were recognized in equity. Upon adoption, under the modified retrospective transition method, we recognized the previously unrecognized excess tax benefits of $37.0 million as increases in deferred tax assets for tax loss carryovers and tax credits, $36.9 million of which were offset by an increase in our U.S. valuation allowance. Additionally, on our Consolidated Statements of Cash Flows excess tax benefits from stock-based awards will no longer be separately classified as a financing activity apart from other income tax, and will be presented as an operating activity. As a result of the adoption of ASU 2016-09, the Consolidated Statement of Cash Flows for the nine months ended July 1, 2017 was adjusted as follows: a $0.4 million increase to net cash provided by operating activities and a $0.4 million decrease to net cash used in financing activities. Finally, we have elected to account for forfeitures as they occur, rather than estimate expected forfeitures, which resulted in a cumulative effect adjustment of $0.7 million to reduce retained earnings as of October 1, 2017. Pending Accounting Pronouncements Derivative Financial Instruments In August 2017, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2017-12, "Derivatives and Hedging (Topic 815) Targeted Improvements to Accounting for Hedging Activities", which amends and simplifies existing guidance to allow companies to more accurately present the economic effects of risk management activities in the financial statements. The guidance is effective for annual reporting periods beginning after December 15, 2018 (our fiscal 2020) including interim reporting periods within those annual reporting periods and early adoption is permitted. We are currently evaluating the impact of the new guidance on our consolidated financial statements. Income Taxes In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory (“ASU 2016-16”). The purpose of ASU 2016-16 is to simplify the income tax accounting of an intra-entity transfer of an asset other than inventory and to record its effect when the transfer occurs. The guidance is effective for annual reporting periods beginning after December 15, 2017 (our fiscal 2019) including interim reporting periods within those annual reporting periods and early adoption is permitted. We are currently evaluating the impact of the new guidance on our consolidated financial statements. We expect to record a net deferred tax asset of approximately $77 million upon adoption, primarily relating to deductible amortization of intangible assets in Ireland. Post adoption, our effective tax rate will no longer include the benefit of this amortization, which is reflected in our effective tax rate reconciliation under the current guidance. Leases In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which will replace the existing guidance in ASC 840, Leases. The updated standard aims to increase transparency and comparability among organizations by requiring lessees to recognize lease assets and lease liabilities on the balance sheet and to disclose important information about leasing arrangements. ASU 2016-02 is effective for annual periods beginning after December 15, 2018 (our fiscal 2020) and interim periods within those annual periods. Early adoption is permitted and modified retrospective application is required. We are currently evaluating the impact of the new guidance on our consolidated financial statements. Revenue Recognition In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers: Topic 606 (ASU 2014-09). ASU 2014-09 supersedes nearly all existing revenue recognition guidance under U.S. GAAP. The FASB has also issued additional standards to provide clarification and implementation guidance on ASU 2014-09. The core principle of ASU 2014-09 is to recognize revenue when promised goods or services are transferred to a customer in an amount that reflects the consideration that is expected to be received for those goods or services. Under the new guidance, an entity is required to evaluate revenue recognition through a five-step process: (1) identifying a contract with a customer; (2) identifying the performance obligations in the contract; (3) determining the transaction price; (4) allocating the transaction price to the performance obligations in the contract; and (5) recognizing revenue when (or as) the entity satisfies a performance obligation. The standard also requires disclosure of the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. In applying the principles of ASU 2014-09, it is possible more judgment and estimates may be required within the revenue recognition process than is required under existing U.S. GAAP, including identifying performance obligations, estimating the amount of variable consideration to include in the transaction price, and estimating the value of each performance obligation to allocate the total transaction price to each separate performance obligation. ASU 2014-09 is effective for us in our first quarter of fiscal 2019. Companies may adopt ASU 2014-09 using either the retrospective method, under which each prior reporting period is presented under ASU 2014-09, with the option to elect certain permitted practical expedients, or the modified retrospective method, under which a company adopts ASU 2014-09 from the beginning of the year of initial application with no restatement of comparative periods, with the cumulative effect of initially applying ASU 2014-09 recognized at the date of initial application, with certain additional required disclosures. We currently expect to adopt ASU 2014-09 using the modified retrospective method. While we are continuing to assess the impact of the new standard, we currently believe the most significant impact relates to accounting for our subscription arrangements that include term-based on-premise software licenses bundled with support. Under current GAAP, revenue attributable to these subscription licenses is recognized ratably over the term of the arrangement because VSOE does not exist for the undelivered support element as it is not sold separately. Under the new standard, the requirement to have VSOE for undelivered elements to enable the separation of revenue for the delivered software licenses is eliminated. Accordingly, under the new standard we will be required to recognize as revenue a portion of the subscription fee upon delivery of the software license. We currently expect revenue related to our perpetual licenses and related support contracts, professional services and cloud offerings to remain substantially unchanged. Due to the complexity of certain of our contracts, the actual revenue recognition treatment required under the new standard may be dependent on contract-specific terms and, therefore, may vary in some instances. Upon implementation of the new standard in fiscal 2019, we expect to make prospective revisions to contract terms with our customers that will result in shortening the initial, non-cancellable term of our multi-year subscriptions to one year for contract periods that begin on or after October 1, 2018. This change will result in annual contractual periods for most of our software subscriptions, the license portion of which will be recognized at the beginning of each annual contract period upon delivery of the licenses and the support portion of which will be recognized ratably over the one-year contractual period. As a result, we anticipate one year of subscription revenue will be recognized for each contract each year; however, more of the revenue will be recognized in the quarter that the contract period begins and less will be recognized in the subsequent three quarters of the contract than under the current accounting rules. Under the modified retrospective method, we will evaluate each contract that is ongoing on the adoption date as if that contract had been accounted for under ASU 2014-09 from contract inception. Some license revenue related to subscription arrangements that would have been recognized in future periods under current GAAP will be recast under ASU 2014-09 as if the revenue had been recognized in prior periods. Under this transition method, we will not adjust historical reported revenue amounts. Instead, the revenue that would have been recognized under this method prior to the adoption date will be an adjustment to retained earnings and will not be recognized as revenue in future periods as previously expected. Because we expect that license revenue associated with subscription contracts will be recognized up front instead of over time under ASU 2014-09, we expect a material portion of our deferred revenue will be adjusted to retained earnings upon adoption. During the first year of adoption, we will record and disclose the amount of this retained earnings adjustment and intend to provide supplemental disclosure of how this revenue would have been recognized under the current rules. Another significant provision under ASU 2014-09 includes the capitalization and amortization of costs associated with obtaining a contract, such as sales commissions. Currently, we expense sales commissions in the period incurred. Under ASU 2014-09, direct and incremental costs to acquire a contract are capitalized and amortized using a systematic basis over the pattern of transfer of the goods and services to which the asset relates. While we are continuing to assess the impact of this provision of ASU 2014-09, we likely will be required to capitalize incremental costs such as commissions and amortize those costs over the period the capitalized assets are expected to contribute to future cash flows. Furthermore, we have made and will continue to make investments in systems and processes to enable timely and accurate reporting under the new standard. We currently expect that necessary operational and internal control structural changes will be implemented prior to the adoption date.

Deferred Revenue and Related Cu

Deferred Revenue and Related Customer Receivables	9 Months Ended
	Jun. 30, 2018
Deferred Revenue And Financing Receivables [Abstract]
Deferred Revenue and Related Customer Receivables	Deferred Revenue and Related Customer Receivables Deferred Revenue Deferred revenue primarily relates to software agreements billed to customers for which the subscription and support services have not yet been provided. The liability associated with performing these subscription and support services is included in deferred revenue and, if not yet paid, the related customer receivable is included in prepaid expenses and other current assets. Billed but uncollected support and subscription-related amounts included in other current assets at June 30, 2018 and September 30, 2017 were $108.7 million and $160.9 million , respectively.

Restructuring and Other Charges

Restructuring and Other Charges	9 Months Ended
	Jun. 30, 2018
Restructuring [Abstract]
Restructuring and Other Charges	Restructuring and Other Charges Restructuring Charges (Credits) In fiscal 2016, we initiated a plan to restructure our workforce and consolidate select facilities to reduce our cost structure and to realign our investments with what we believe to be our higher growth opportunities. The actions have resulted in total restructuring charges of $84.5 million , primarily associated with termination benefits associated with approximately 800 employees. This restructuring plan was substantially completed in 2017. The following table summarizes restructuring accrual activity for the nine months ended June 30, 2018 : Employee severance and related benefits Facility closures and related costs Total (in thousands) October 1, 2017 $ 1,736 $ 4,508 $ 6,244 Credit to operations, net (509 ) (505 ) (1,014 ) Cash disbursements (1,247 ) (1,207 ) (2,454 ) Foreign exchange impact 20 (80 ) (60 ) Accrual, June 30, 2018 $ — $ 2,716 $ 2,716 The following table summarizes restructuring accrual activity for the nine months ended July 1, 2017 : Employee severance and related benefits Facility closures and related costs Total (in thousands) October 1, 2016 $ 35,177 $ 1,431 $ 36,608 Charges to operations, net 2,582 5,718 8,300 Cash disbursements (33,979 ) (1,351 ) (35,330 ) Other non-cash charges — (704 ) (704 ) Foreign exchange impact (800 ) 98 (702 ) Accrual, July 1, 2017 $ 2,980 $ 5,192 $ 8,172 Of the accrual for facility closures and related costs, as of June 30, 2018, $1.6 million is included in accrued expenses and other current liabilities and $1.1 million is included in other liabilities in the Consolidated Balance Sheets. The accrual for facility closures is net of assumed sublease income of $3.1 million . The accrual for employee severance and related benefits is included in accrued compensation and benefits in the Consolidated Balance Sheets. Other - Headquarters relocation charges Headquarters relocation charges represent accelerated depreciation expense recorded in anticipation of exiting our current headquarters facility. In 2019, we will be moving into a new worldwide headquarters in the Boston Seaport District, and we will be vacating our current headquarters space. Because our current headquarters lease will not expire until November 2022, we are seeking to sublease that space. Further, if we are unable to sublease our current headquarters space for an amount at least equal to our rent obligations under the current headquarters lease, we will bear overlapping rent obligations for those premises and will be required to record additional headquarters relocation charges related to any rent shortfall. A charge for such shortfall will be recorded in the earlier of the period that we cease using the space (which will likely occur in the second quarter of our fiscal 2019) or the period we exit the lease contract. Additionally, we will incur other costs associated with the move which will be recorded as incurred. In the third quarter and first nine months of 2018, we recorded $1.9 million and $2.9 million , respectively, of accelerated depreciation expense related to shortening the estimated useful lives of leasehold improvements in our current facility.

Stock-based Compensation

Stock-based Compensation	9 Months Ended
	Jun. 30, 2018
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]
Stock-Based Compensation	Stock-based Compensation We measure the cost of employee services received in exchange for restricted stock unit (RSU) awards based on the fair value of RSU awards on the date of grant. That cost is recognized over the period during which an employee is required to provide service in exchange for the award. Our equity incentive plan provides for grants of nonqualified and incentive stock options, common stock, restricted stock, RSUs and stock appreciation rights to employees, directors, officers and consultants. We award RSUs as the principal equity incentive awards, including performance-based awards that are earned based on achievement of performance criteria established by the Compensation Committee of our Board of Directors. Each RSU represents the contingent right to receive one share of our common stock. Beginning in the first quarter of 2018, we account for forfeitures as they occur, rather than estimate expected forfeitures. Our employee stock purchase plan (ESPP), initiated in the fourth quarter of 2016, allows eligible employees to contribute up to 10% of their base salary, up to a maximum of $25,000 per year and subject to other plan limitations, toward the purchase of our common stock at a discounted price. The purchase price of the shares on each purchase date is equal to 85% of the lower of the fair market value of our common stock on the first and last trading days of each offering period. The ESPP is qualified under Section 423 of the Internal Revenue Code. We estimate the fair value of each purchase right under the ESPP on the date of grant using the Black-Scholes option valuation model and use the straight-line attribution approach to record the expense over the six-month offering period. Restricted stock unit activity for the nine months ended June 30, 2018 Shares Weighted Average Grant Date Fair Value (Per Share) (in thousands) Balance of outstanding restricted stock units October 1, 2017 3,487 $ 45.57 Granted (1) 2,167 $ 75.99 Vested (1,804 ) $ 43.94 Forfeited or not earned (531 ) $ 50.95 Balance of outstanding restricted stock units June 30, 2018 3,319 $ 65.48 _________________ (1) Restricted stock granted includes 184,000 shares from prior period TSR awards that were earned upon achievement of the performance criteria and vested in November 2018. Restricted Stock Units Grant Period Performance-based RSUs (1) Service-based RSUs (2) (Number of Units in thousands) First nine months of 2018 961 1,022 _________________ (1) Substantially all the performance-based RSUs were granted to our executive officers. Approximately 189,000 shares are eligible to vest based upon annual performance measures, measured over a three -year period. RSUs not earned for a period may be earned in the third period. An additional 250,000 shares are eligible to vest based upon a 2018 performance measure. To the extent earned, those performance-based RSUs will vest in three substantially equal installments on November 15, 2018, November 15, 2019 and November 15, 2020, or the date the Compensation Committee determines the extent to which the applicable performance criteria have been achieved for each performance period. An additional 500,000 shares are eligible to vest based upon annual performance measures, measured over a three -year period in fiscal years 2021, 2022 and 2023. RSUs not earned for a period may be earned in the third period. (2) The service-based RSUs were granted to employees, our executive officers and our directors. Substantially all service-based RSUs will vest in three substantially equal annual installments on or about the anniversary of the date of grant. Compensation expense recorded for our stock-based awards was classified in our Consolidated Statements of Operations as follows: Three months ended Nine months ended June 30, July 1, June 30, July 1, (in thousands) Cost of license and subscription revenue $ 421 $ 347 $ 1,242 $ 954 Cost of support revenue 527 1,139 2,025 3,638 Cost of professional services revenue 1,471 1,505 4,846 4,500 Sales and marketing 4,910 3,296 14,827 11,047 Research and development 3,283 2,805 9,626 9,753 General and administrative 6,046 7,482 19,449 26,247 Total stock-based compensation expense $ 16,658 $ 16,574 $ 52,015 $ 56,139 Stock-based compensation expense includes $1.1 million and $3.2 million in the third quarter and first nine months of 2018, respectively, and $0.9 million and $2.2 million in the third quarter and first nine months of 2017, respectively, related to the ESPP.

Earnings per Share (EPS) and Co

Earnings per Share (EPS) and Common Stock	9 Months Ended
	Jun. 30, 2018
Earnings Per Share and Common Stock
Earnings(loss) per Share (EPS) and Common Stock	Earnings per Share (EPS) and Common Stock EPS Basic EPS is calculated by dividing net income by the weighted average number of shares outstanding during the period. Diluted EPS is calculated by dividing net income by the weighted average number of shares outstanding plus the dilutive effect, if any, of outstanding RSUs using the treasury stock method. The calculation of the dilutive effect of outstanding equity awards under the treasury stock method includes consideration of unrecognized compensation expense as additional proceeds. Three months ended Nine months ended Calculation of Basic and Diluted EPS June 30, July 1, June 30, July 1, (in thousands, except per share data) Net income (loss) $ 16,997 $ (951 ) $ 38,796 $ (11,196 ) Weighted average shares outstanding—Basic 115,774 115,615 115,915 115,511 Dilutive effect of restricted stock units 1,726 — 1,772 — Weighted average shares outstanding—Diluted 117,500 115,615 117,687 115,511 Earnings (loss) per share—Basic $ 0.15 $ (0.01 ) $ 0.33 $ (0.10 ) Earnings (loss) per share—Diluted $ 0.14 $ (0.01 ) $ 0.33 $ (0.10 ) There were 0.1 million antidilutive shares for the nine months ended June 30, 2018 . Total antidilutive shares were 2.0 million for the nine months ended July 1, 2017 . For the nine months ended July 1, 2017 the diluted net loss per share is the same as the basic net loss per share as the effects of all our potential common stock equivalents are antidilutive, because we reported a loss for the period. Common Stock Repurchases Our Articles of Organization authorize us to issue up to 500 million shares of our common stock. Our Board of Directors periodically authorizes the repurchase of shares of our common stock. All shares of our common stock repurchased are automatically restored to the status of authorized and unissued. On September 14, 2017, our Board of Directors authorized us to repurchase up to $500 million of our common stock in the period October 1, 2017 through September 30, 2020. In the first nine months of 2018 and 2017, we repurchased $100 million and $35 million , respectively, of our common stock. The 2018 repurchase was accomplished through an accelerated share repurchase ("ASR") agreement with a major financial institution that we entered into in April 2018. Under this ASR, we repurchased our common stock at a purchase price determined by the average market price over a period of time, with final settlement in June 2018. In July 2018, our Board of Directors has authorized us to repurchase up to an additional $1,000 million of our common stock through September 30, 2020. We entered into a new $1,000 million ASR as described in Note 14. Subsequent Events . Final settlement of this ASR is expected to occur in 7.5 to 10 months.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets In 2017, we had three operating and reportable segments: (1) Solutions Group, (2) IoT Group and (3) Professional Services. Effective with the beginning of the first quarter of 2018, we changed our operating and reportable segments from three to two : (1) Software Products and (2) Professional Services. We assess goodwill for impairment at the reporting unit level. Our reporting units are determined based on the components of our operating segments that constitute a business for which discrete financial information is available and for which operating results are regularly reviewed by segment management. Our reporting units are the same as our operating segments. As of June 30, 2018 , goodwill and acquired intangible assets in the aggregate attributable to our Software Products segment was $1,366.8 million and our Professional Services segment was $30.3 million . As of September 30, 2017 , goodwill and acquired intangible assets in the aggregate attributable to our Software Products segment was $1,410.0 million and our Professional Services segment was $30.6 million . Acquired intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying value of the asset may not be recoverable. We completed our annual goodwill impairment review as of June 30, 2018 based on a qualitative assessment. Our qualitative assessment included company specific (financial performance and long-range plans), industry, and macroeconomic factors, and consideration of the fair value of each reporting unit relative to its carrying value at the last valuation date. Based on our qualitative assessment, we believe it is more likely than not that the fair values of our reporting units exceed their carrying values and no further impairment testing is required. Goodwill and acquired intangible assets consisted of the following: June 30, 2018 September 30, 2017 Gross Carrying Amount Accumulated Amortization Net Book Value Gross Carrying Amount Accumulated Amortization Net Book Value (in thousands) Goodwill (not amortized) $ 1,182,462 $ 1,182,772 Intangible assets with finite lives (amortized) (1): Purchased software $ 362,992 $ 247,694 $ 115,298 $ 362,955 $ 228,377 $ 134,578 Capitalized software 22,877 22,877 — 22,877 22,877 — Customer lists and relationships 357,904 262,982 94,922 359,932 241,554 118,378 Trademarks and trade names 19,080 14,643 4,437 19,138 14,186 4,952 Other 4,013 4,013 — 4,030 4,030 — $ 766,866 $ 552,209 $ 214,657 $ 768,932 $ 511,024 $ 257,908 Total goodwill and acquired intangible assets $ 1,397,119 $ 1,440,680 (1) The weighted-average useful lives of purchased software, customer lists and relationships, and trademarks and trade names with a remaining net book value are 9 years, 10 years, and 10 years, respectively. Goodwill Changes in goodwill presented by reportable segments were as follows: Software Products Professional Services Total (in thousands) Balance, October 1, 2017 $ 1,152,917 $ 29,855 $ 1,182,772 Acquisition 4,350 — 4,350 Foreign currency translation adjustment (4,542 ) (118 ) (4,660 ) Balance, June 30, 2018 $ 1,152,725 $ 29,737 $ 1,182,462 Amortization of Intangible Assets The aggregate amortization expense for intangible assets with finite lives was classified in our Consolidated Statements of Operations as follows: Three months ended Nine months ended June 30, July 1, June 30, July 1, (in thousands) Amortization of acquired intangible assets $ 7,850 $ 7,973 $ 23,566 $ 23,986 Cost of license and subscription revenue 6,798 6,517 20,029 19,294 Total amortization expense $ 14,648 $ 14,490 $ 43,595 $ 43,280

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Fair value is defined as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required to be recorded at fair value, we consider the principal or most advantageous market in which we would transact and consider assumptions that market participants would use when pricing the asset or liability, such as inherent risk, transfer restrictions, and risk of nonperformance. Generally accepted accounting principles prescribe a fair value hierarchy that requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Three levels of inputs that may be used to measure fair value: • Level 1: quoted prices (unadjusted) in active markets for identical assets or liabilities; • Level 2: inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in active markets for similar assets or liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; or • Level 3: unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Money market funds, time deposits and corporate notes/bonds are classified within Level 1 of the fair value hierarchy because they are valued based on quoted market prices in active markets. Certificates of deposit, commercial paper and certain U.S. government agency securities are classified within Level 2 of the fair value hierarchy. These instruments are valued based on quoted prices in markets that are not active or based on other observable inputs consisting of market yields, reported trades and broker/dealer quotes. The principal market in which we execute our foreign currency contracts is the institutional market in an over-the-counter environment with a relatively high level of price transparency. The market participants usually are large financial institutions. Our foreign currency contracts’ valuation inputs are based on quoted prices and quoted pricing intervals from public data sources and do not involve management judgment. These contracts are typically classified within Level 2 of the fair value hierarchy. The fair value of our contingent consideration arrangements is determined based on our evaluation of the probability and amount of any earn-out that will be achieved based on expected future performances by the acquired entities. These arrangements are classified within Level 3 of the fair value hierarchy. Our significant financial assets and liabilities measured at fair value on a recurring basis as of June 30, 2018 and September 30, 2017 were as follows: June 30, 2018 Level 1 Level 2 Level 3 Total (in thousands) Financial assets: Cash equivalents $ 85,382 $ — $ — $ 85,382 Marketable securities Certificates of deposit — 219 — 219 Corporate notes/bonds 52,962 — — 52,962 U.S. government agency securities — 991 — 991 Forward contracts — 4,956 — 4,956 $ 138,344 $ 6,166 $ — $ 144,510 Financial liabilities: Contingent consideration related to acquisitions $ — $ — $ 2,100 $ 2,100 Forward contracts — 1,190 — 1,190 $ — $ 1,190 $ 2,100 $ 3,290 September 30, 2017 Level 1 Level 2 Level 3 Total (in thousands) Financial assets: Cash equivalents $ 49,845 $ — $ — $ 49,845 Marketable securities Certificates of deposit — 240 — 240 Corporate notes/bonds 47,673 — — 47,673 U.S. government agency securities — 2,402 — 2,402 Forward contracts — 1,163 — 1,163 $ 97,518 $ 3,805 $ — $ 101,323 Financial liabilities: Contingent consideration related to acquisitions $ — $ — $ 8,400 $ 8,400 Forward contracts — 4,347 — 4,347 $ — $ 4,347 $ 8,400 $ 12,747 Changes in the fair value of Level 3 contingent consideration liability associated with our acquisitions were as follows: Contingent Consideration (in thousands) Kepware Other Total Balance, October 1, 2017 $ 8,400 $ — $ 8,400 Addition to contingent consideration — 2,100 2,100 Payment of contingent consideration (8,400 ) — (8,400 ) Balance, June 30, 2018 $ — $ 2,100 $ 2,100 Contingent Consideration (in thousands) ColdLight Kepware Total Balance, October 1, 2016 $ 2,500 $ 17,070 $ 19,570 Change in present value of contingent consideration — 392 392 Payment of contingent consideration (2,500 ) (9,600 ) (12,100 ) Balance, July 1, 2017 $ — $ 7,862 $ 7,862 In the Consolidated Balance Sheet as of June 30, 2018 , $1.1 million of the contingent consideration liability is included in accrued expenses and other current liabilities with the remaining $1.0 million in other liabilities. Of the $8.4 million payments in the first nine months of 2018, $7.8 million represents the fair value of the liabilities recorded at the acquisition date and is included in financing activities in the Consolidated Statements of Cash Flows. Of the $12.1 million payments in the first nine months of 2017, $11.1 million represents the fair value of the liabilities recorded at the acquisition date and is included in financing activities in the Consolidated Statements of Cash Flows. In connection with our acquisition of Kepware, the former shareholders were eligible to receive additional consideration of up to $18.0 million , which was contingent on the achievement of certain Financial Performance, Product Integration and Business Integration targets (as defined in the Stock Purchase Agreement) within 24 months from April 1, 2016. The estimated undiscounted range of outcomes for the contingent consideration was $16.9 million to $18.0 million at the acquisition date. As of June 30, 2018, we had made $18.0 million in payments and had no liability remaining.

Marketable Securities

Marketable Securities	9 Months Ended
	Jun. 30, 2018
Marketable Securities [Abstract]
Marketable Securities	Marketable Securities The amortized cost and fair value of marketable securities as of June 30, 2018 and September 30, 2017 were as follows: June 30, 2018 Amortized cost Gross unrealized gains Gross unrealized losses Fair value (in thousands) Certificates of deposit $ 221 $ — $ (2 ) $ 219 Corporate notes/bonds 53,474 — (512 ) 52,962 U.S. government agency securities 1,000 — (9 ) 991 $ 54,695 $ — $ (523 ) $ 54,172 September 30, 2017 Amortized cost Gross unrealized gains Gross unrealized losses Fair value (in thousands) Certificates of deposit $ 240 $ — $ — $ 240 Corporate notes/bonds 47,811 2 (140 ) 47,673 U.S. government agency securities 2,407 — (5 ) 2,402 $ 50,458 $ 2 $ (145 ) $ 50,315 Our investment portfolio consists of certificates of deposit, commercial paper, corporate notes/bonds and government securities that have a maximum maturity of three years. The longer the duration of these securities, the more susceptible they are to changes in market interest rates and bond yields. All unrealized losses are due to changes in market interest rates, bond yields and/or credit ratings. We review our investments to identify and evaluate investments that have an indication of possible impairment. We concluded that, at June 30, 2018 , the unrealized losses were temporary. The following tables summarize the fair value and gross unrealized losses aggregated by category and the length of time that individual securities have been in a continuous unrealized loss position as of June 30, 2018 and September 30, 2017 . June 30, 2018 Less than twelve months Greater than twelve months Total Fair Value Gross unrealized loss Fair Value Gross unrealized loss Fair Value Gross unrealized loss (in thousands) Certificates of deposit $ 219 $ (2 ) $ — $ — $ 219 $ (2 ) Corporate notes/bonds 31,516 (358 ) 21,446 (154 ) 52,962 (512 ) U.S. government agency securities — — 991 (9 ) 991 (9 ) $ 31,735 $ (360 ) $ 22,437 $ (163 ) $ 54,172 $ (523 ) September 30, 2017 Less than twelve months Greater than twelve months Total Fair Value Gross unrealized loss Fair Value Gross unrealized loss Fair Value Gross unrealized loss (in thousands) Certificates of deposit $ 240 $ — $ — $ — $ 240 $ — Corporate notes/bonds 15,254 (43 ) 28,885 (97 ) 44,139 (140 ) U.S. government agency securities — — 2,402 (5 ) 2,402 (5 ) $ 15,494 $ (43 ) $ 31,287 $ (102 ) $ 46,781 $ (145 ) The following table presents our available-for-sale marketable securities by contractual maturity date as of June 30, 2018 and September 30, 2017 . June 30, 2018 September 30, 2017 Amortized cost Fair value Amortized cost Fair value (in thousands) (in thousands) Due in one year or less $ 22,300 $ 22,170 $ 18,274 $ 18,244 Due after one year through three years 32,395 32,002 32,184 32,071 $ 54,695 $ 54,172 $ 50,458 $ 50,315

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments Our earnings and cash flows are subject to fluctuations due to changes in foreign currency exchange rates. Our most significant foreign currency exposures relate to Western European countries, Japan, China and Canada. Our foreign currency risk management strategy is principally designed to mitigate the future potential financial impact of changes in the U.S. Dollar value of anticipated transactions and balances denominated in foreign currency, resulting from changes in foreign currency exchange rates. We enter into derivative transactions, specifically foreign currency forward contracts, to manage the exposures to foreign currency exchange risk to reduce earnings volatility. We do not enter into derivatives transactions for trading or speculative purposes. Non-Designated Hedges We hedge our net foreign currency monetary assets and liabilities primarily resulting from foreign currency denominated receivables and payables with foreign exchange forward contracts to reduce the risk that our earnings and cash flows will be adversely affected by changes in foreign currency exchange rates. These contracts have maturities of up to approximately three months. Generally, we do not designate these foreign currency forward contracts as hedges for accounting purposes and changes in the fair value of these instruments are recognized immediately in earnings. Because we enter into forward contracts only as an economic hedge, any gain or loss on the underlying foreign-denominated balance would be offset by the loss or gain on the forward contract. Gains and losses on forward contracts and foreign denominated receivables and payables are included in interest income and other expense, net. As of June 30, 2018 and September 30, 2017 , we had outstanding forward contracts with notional amounts equivalent to the following: Currency Hedged June 30, September 30, (in thousands) Australian / U.S. Dollar $ 3,226 $ 1,585 Canadian / U.S. Dollar 7,421 12,809 Swiss Franc / Euro — 7,157 Chinese Yuan offshore / Euro — 10,423 Euro / U.S. Dollar 309,733 244,000 Japanese Yen / Euro — 17,694 Israeli Shekel / U.S. Dollar 7,677 8,820 Japanese Yen / U.S. Dollar 18,152 3,198 Swedish Krona / U.S. Dollar 8,568 4,627 Danish Krona / U.S. Dollar 2,645 1,743 Hong Kong / U.S. Dollar 2,628 915 All other 8,151 5,548 Total $ 368,201 $ 318,519 The following table shows the effect of our non-designated hedges in the Consolidated Statements of Operations for the three and nine months ended June 30, 2018 and July 1, 2017 : Derivatives Not Designated as Hedging Instruments Location of Gain or (Loss) Recognized in Income Net realized and unrealized gain or (loss) (excluding the underlying foreign currency exposure being hedged) Three months ended Nine months ended June 30, July 1, June 30, July 1, (in thousands) Forward Contracts Interest income and other expense, net $ (9,392 ) $ 6,669 $ (6,370 ) $ (1,422 ) In the three and nine months ended June 30, 2018 , foreign currency losses, net were $2.2 million and $5.4 million , respectively. In the three and nine months ended July 1, 2017 , foreign currency losses, net were $0.7 million and $3.2 million , respectively. Cash Flow Hedges Our foreign exchange risk management program objective is to identify foreign exchange exposures and implement appropriate hedging strategies to minimize earnings fluctuations resulting from foreign exchange rate movements. We designate certain foreign exchange forward contracts as cash flow hedges of Euro, Yen and SEK denominated intercompany forecasted revenue transactions (supported by third party sales). All foreign exchange forward contracts are carried at fair value on the Consolidated Balance Sheets and the maximum duration of foreign exchange forward contracts is 15 months. Cash flow hedge relationships are designated at inception, and effectiveness is assessed prospectively and retrospectively using regression analysis monthly. As the forward contracts are highly effective in offsetting changes to future cash flows on the hedged transactions, we record the effective portion of changes in these cash flow hedges in accumulated other comprehensive income and subsequently reclassify it into earnings in the period during which the hedged transactions are recognized in earnings. Changes in the fair value of foreign exchange forward contracts due to changes in time value are included in the assessment of effectiveness. Our derivatives are not subject to any credit contingent features. We manage credit risk with counterparties by trading among several counterparties and we review our counterparties’ credit at least quarterly. As of June 30, 2018 and September 30, 2017 , we had outstanding forward contracts designated as cash flow hedges with notional amounts equivalent to the following: Currency Hedged June 30, September 30, (in thousands) Euro / U.S. Dollar $ 44,699 $ 64,831 Japanese Yen / U.S. Dollar 11,830 22,675 SEK / U.S. Dollar 10,521 14,091 Total $ 67,050 $ 101,597 The following table shows the effect of our derivative instruments designated as cash flow hedges in the Consolidated Statements of Operations for the three and nine months ended June 30, 2018 and July 1, 2017 (in thousands): Derivatives Designated as Hedging Instruments Gain or (Loss) Recognized in OCI-Effective Portion Location of Gain or (Loss) Reclassified from OCI into Income-Effective Portion Gain or (Loss) Reclassified from OCI into Income-Effective Portion Location of Gain or (Loss) Recognized-Ineffective Portion Gain or (Loss) Recognized-Ineffective Portion Three months ended Three months ended Three months ended June 30, July 1, June 30, July 1, June 30, July 1, Forward Contracts $ 4,468 $ (2,627 ) Subscription, support and license revenue $ (277 ) $ (86 ) Interest income and other expense, net $ 52 $ (29 ) Nine months ended Nine months ended Nine months ended June 30, July 1, June 30, July 1, June 30, July 1, Forward Contracts $ 1,086 $ 256 Subscription, support and license revenue $ (2,659 ) $ 888 Interest income and other expense, net $ 17 $ (23 ) As of June 30, 2018 , we estimated that all amounts reported in accumulated other comprehensive income will be reclassified to income within the next twelve months. If an underlying forecast transaction does not occur, or it becomes probable that it will not occur, the related hedge gains and losses on the cash flow hedge would be immediately reclassified to interest income and other expense, net on the Consolidated Statements of Operations. For the three and nine months ended June 30, 2018 and July 1, 2017 , there were no such gains or losses. The following table shows our derivative instruments measured at gross fair value as reflected in the Consolidated Balance Sheets: Fair Value of Derivatives Designated As Hedging Instruments Fair Value of Derivatives Not Designated As Hedging Instruments June 30, September 30, June 30, September 30, (in thousands) (in thousands) Derivative assets (1): Forward Contracts $ 1,994 $ 540 $ 2,962 $ 623 Derivative liabilities (2): Forward Contracts $ 16 $ 2,352 $ 1,174 $ 1,995 (1) As of June 30, 2018, $4,956 thousand current derivative assets are recorded in other current assets, in the Consolidated Balance Sheets. As of September 30, 2017, $1,128 thousand current derivative assets are recorded in other current assets, and $35 thousand long-term derivative assets are recorded in other assets in the Consolidated Balance Sheets. (2) As of June 30, 2018, $1,190 thousand current derivative liabilities are recorded in accrued expenses and other current liabilities in the Consolidated Balance Sheets. As of September 30, 2017, $4,329 thousand current derivative liabilities are recorded in accrued expenses and other current liabilities, and $18 thousand long term derivative liabilities are recorded in other liabilities in the Consolidated Balance Sheets. Offsetting Derivative Assets and Liabilities We have entered into master netting arrangements that allow net settlements under certain conditions. Although netting is permitted, it is currently our policy and practice to record all derivative assets and liabilities on a gross basis in the Consolidated Balance Sheets. The following table sets forth the offsetting of derivative assets as of June 30, 2018 : Gross Amounts Offset in the Consolidated Balance Sheets Gross Amounts Not Offset in the Consolidated Balance Sheets As of June 30, 2018 Gross Amount of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Assets Presented in the Consolidated Balance Sheets Financial Instruments Cash Collateral Received Net Amount (in thousands) Forward Contracts $ 4,956 $ — $ 4,956 $ (1,190 ) $ — $ 3,766 The following table sets forth the offsetting of derivative liabilities as of June 30, 2018 : Gross Amounts Offset in the Consolidated Balance Sheets Gross Amounts Not Offset in the Consolidated Balance Sheets As of June 30, 2018 Gross Amount of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Liabilities Presented in the Consolidated Balance Sheets Financial Instruments Cash Collateral Pledged Net Amount (in thousands) Forward Contracts $ 1,190 $ — $ 1,190 $ (1,190 ) $ — $ —

Segment Information

Segment Information	9 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Segment Information	Segment Information Effective with the beginning of fiscal 2018, we changed our segments, see Note 1. Basis of Presentation for additional information. We operate within a single industry segment -- computer software and related services. Operating segments as defined under GAAP are components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker, or decision-making group, in deciding how to allocate resources and in assessing performance. Our chief operating decision maker is our President and Chief Executive Officer. We have two operating and reportable segments: (1) Software Products, which includes license, subscription and related support revenue (including updates and technical support) for all our products; and (2) Professional Services, which includes consulting, implementation and training services. We do not allocate sales & marketing or general and administrative expense to our operating segments as these activities are managed on a consolidated basis. Additionally, segment profit does not include stock-based compensation, amortization of intangible assets, restructuring charges and certain other identified costs that we do not allocate to the segments for purposes of evaluating their operational performance. The revenue and profit attributable to our operating segments are summarized below. We do not produce asset information by reportable segment; therefore, it is not reported. Three months ended Nine months ended June 30, July 1, June 30, July 1, (in thousands) Software Products Revenue $ 273,619 $ 247,635 $ 801,262 $ 722,724 Operating Costs (1) 96,422 94,325 293,417 273,196 Profit 177,197 153,310 507,845 449,528 Professional Services Revenue 41,158 43,658 128,041 134,936 Operating Costs (2) 33,945 35,588 104,634 110,681 Profit 7,213 8,070 23,407 24,255 Total segment revenue 314,777 291,293 929,303 857,660 Total segment costs 130,367 129,913 398,051 383,877 Total segment profit 184,410 161,380 531,252 473,783 Unallocated operating expenses: Sales and marketing expenses 102,831 89,805 290,559 260,521 General and administrative expenses 25,458 27,263 80,272 81,270 Restructuring and headquarters relocation charges, net 1,627 1,551 1,846 8,300 Intangibles amortization 14,648 14,490 43,595 43,280 Stock-based compensation 16,658 16,574 52,015 56,139 Other unallocated operating expenses (3) 1,485 441 1,425 943 Total operating income 21,703 11,256 61,540 23,330 Interest expense (10,646 ) (10,200 ) (31,072 ) (32,239 ) Interest income and other expense, net (1,086 ) (357 ) (2,481 ) 2,049 Income (loss) before income taxes $ 9,971 $ 699 $ 27,987 $ (6,860 ) (1) Operating costs for the Software Products segment includes all cost of software revenue and research and development costs, excluding stock-based compensation and intangible amortization. (2) Operating costs for the Professional Services segment includes all cost of professional services revenue, excluding stock-based compensation, intangible amortization, and fair value adjustments for deferred services costs. (3) Other unallocated operating expenses include acquisition-related and other transactional costs, pension plan termination-related costs and fair value adjustments for deferred services costs.

Income Taxes

Income Taxes	9 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes In the third quarter and first nine months of 2018 , our effective tax rate was (70)% on pre-tax income of $10.0 million , and (39)% on pre-tax income of $28.0 million , respectively, compared to 236% on pre-tax income of $0.7 million , and (63)% on a pre-tax loss of $6.9 million in the third quarter and first nine months of 2017 , respectively. In the first nine months of 2018 and 2017 , our effective tax rate was lower than the statutory federal income tax rates ( 21% and 35% , respectively) due to U.S. tax reform, as described below, and our corporate structure in which our foreign taxes are at a net effective tax rate lower than the U.S. rate. A significant amount of our foreign earnings is generated by our subsidiaries organized in Ireland. In 2018 and 2017, the foreign rate differential predominantly relates to these Irish earnings. Our foreign rate differential in 2018 and 2017 includes the continuing rate benefit from a business realignment completed on September 30, 2014 in which intellectual property was transferred between two wholly-owned foreign subsidiaries. For the first nine months of 2018 and 2017 , this realignment resulted in tax benefits of approximately $9 million and $21 million , respectively. On December 22, 2017, the United States enacted tax reform legislation through the Tax Cuts and Jobs Act, (the "Tax Act"), which significantly changed existing U.S. tax laws by a reduction of the corporate tax rate, the implementation of a new system of taxation for non-U.S. earnings, the imposition of a one-time tax on the deemed repatriation of undistributed earnings of non-U.S. subsidiaries, and by the expansion of the limitations on the deductibility of executive compensation and interest expense. As we have a September 30 fiscal year-end, there is a blended U.S. statutory federal rate of approximately 24.5% for our fiscal year ending September 30, 2018 and 21% for subsequent fiscal years. The Tax Act also provides that net operating losses generated in years ending after December 31, 2017 will be carried forward indefinitely and can no longer be carried back, and that net operating losses generated in years beginning after December 31, 2017 can only reduce taxable income by up to 80% when utilized in a future period. We estimate no federal income taxes payable as a result of the deemed repatriation of undistributed earnings as we estimate that the tax will be offset by a combination of current year losses and existing attributes which had a full valuation allowance recorded against the related deferred tax assets. In the third quarter we reduced our estimate for state income taxes payable by $5.4 million to reflect additional guidance on the state implications of the Tax Act. In the first nine months of 2018, we recorded a reasonable estimate of state income taxes payable on the deemed repatriation of $1.7 million . We also recorded a deferred tax benefit of $14.1 million as a reasonable estimate of the impact of the Tax Act on our net U.S. deferred income tax balances. This was primarily attributable to the reduction of the federal tax rate on the net deferred tax liability in the U.S., and the ability to realize net operating losses from the reversal of existing deferred tax assets which can now be carried forward indefinitely and can therefore be netted against deferred tax liabilities for indefinite lived intangible assets. We are continuing to assess the effects of the Tax Act on our indefinite reinvestment assertion and the realizability of our U.S. deferred tax assets. We are not able to make reasonable estimates at this time of the effects of certain provisions of the Tax Act that will apply to us beginning in our fiscal year ending September 30, 2019, including the Global Intangible Low Tax Income tax (the "GILTI" tax). The changes included in the Tax Act are broad and complex. The final transition impacts of the Tax Act may differ from the above estimates, possibly materially, due to, among other things, changes in interpretations of the Tax Act, any legislative action to address questions that arise because of the Tax Act, actions taken by U.S. state governments and taxing authorities in response to the Tax Act, any changes in accounting standards for income taxes or related interpretations in response to the Tax Act, or any updates or changes to estimates we have utilized to calculate the transition impacts, including impacts from changes to current year earnings estimates and foreign currency exchange rates of foreign subsidiaries. The Securities Exchange Commission has issued rules that allow for a measurement period of up to one year after the enactment date of the Tax Act to finalize the recording of the related tax impacts. We currently anticipate finalizing and recording any resulting adjustments by the end of our current fiscal year ending September 30, 2018. We have concluded, based on the weight of available evidence, that a full valuation allowance continues to be required against our U.S. net deferred tax assets as they are not more likely than not to be realized in the future. We will continue to reassess our valuation allowance requirements each financial reporting period. In the normal course of business, PTC and its subsidiaries are examined by various taxing authorities, including the Internal Revenue Service in the U.S. We regularly assess the likelihood of additional assessments by tax authorities and provide for these matters as appropriate. We are currently under audit by tax authorities in several jurisdictions. Audits by tax authorities typically involve examination of the deductibility of certain permanent items, limitations on net operating losses and tax credits. Although we believe our tax estimates are appropriate, the final determination of tax audits and any related litigation could result in material changes in our estimates. As of June 30, 2018 and September 30, 2017, we had unrecognized tax benefits of $9.7 million and $14.8 million , respectively. If all our unrecognized tax benefits as of June 30, 2018 were to become recognizable in the future, we would record a benefit to the income tax provision of $9.7 million , which would be partially offset by an increase in the U.S. valuation allowance of $3.8 million . Although we believe our tax estimates are appropriate, the final determination of tax audits and any related litigation could result in favorable or unfavorable changes in our estimates. We believe it is reasonably possible that within the next 12 months the amount of unrecognized tax benefits related to the resolution of multi-jurisdictional tax positions could be reduced by up to $2 million as audits close and statutes of limitations expire. In the fourth quarter of 2016, we received an assessment of approximately $12 million from the tax authorities in Korea. The assessment relates to various tax issues, primarily foreign withholding taxes. We have appealed and intend to vigorously defend our positions. We believe that upon completion of a multi-level appeal process it is more likely than not that our positions will be sustained. Accordingly, we have not recorded a tax reserve for this matter. We paid this assessment in the first quarter of 2017 and have recorded the amount in other assets, pending resolution of the appeal process. In the first quarter of 2018, as a result of the adoption of ASU 2016-09, we recognized previously unrecognized tax benefits of $37.0 million as increases in deferred tax assets for tax loss carryovers and tax credits, primarily in the U.S. A corresponding increase to the valuation allowance of $36.9 million was recorded to the extent that it was not more likely than not that these benefits would be realized.

Debt

Debt	9 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Debt	Debt At June 30, 2018 and September 30, 2017 , we had the following long-term debt obligations: June 30, September 30, (in thousands) 6.000% Senior notes due 2024 $ 500,000 $ 500,000 Credit facility revolver 198,125 218,125 Total debt 698,125 718,125 Unamortized debt issuance costs for the Senior notes (1) (5,072 ) (5,719 ) Total debt, net of issuance costs (2) $ 693,053 $ 712,406 (1) Unamortized debt issuance costs related to the credit facility were $1.3 million and $2.0 million as of June 30, 2018 and September 30, 2017, respectively, and were included in other assets. (2) As of June 30, 2018 and September 30, 2017, all debt was included in long-term debt. Senior Notes In May 2016, we issued $500 million in aggregate principal amount of 6.0% senior, unsecured long-term debt at par value, due in 2024. We used the net proceeds from the sale of the notes to repay a portion of our outstanding revolving loan under our current credit facility. Interest is payable semi-annually on November 15 and May 15. The debt indenture includes covenants that limit our ability to, among other things, incur additional debt, grant liens on our properties or capital stock, enter into sale and leaseback transactions or asset sales, and make capital distributions. We were in compliance with all the covenants as of June 30, 2018 . On or after May 15, 2019, we may redeem the senior notes at any time in whole or from time to time in part at specified redemption prices. In certain circumstances constituting a change of control, we would be required to make an offer to repurchase the senior notes at a purchase price equal to 101% of the aggregate principal amount of the notes, plus accrued and unpaid interest. Our ability to repurchase the senior notes in such event may be limited by law, by the indenture associated with the senior notes, by our then-available financial resources or by the terms of other agreements to which we may be party at such time. If we fail to repurchase the senior notes as required by the indenture, it would constitute an event of default under the indenture governing the senior notes which, in turn, may also constitute an event of default under other obligations. As of June 30, 2018 , the total estimated fair value of the Notes was approximately $520 million , based on quoted prices for the notes on that date. Credit Agreement In November 2015, we entered into a multi-currency credit facility with a syndicate of sixteen banks for which JPMorgan Chase Bank, N.A. acts as Administrative Agent. We use the credit facility for general corporate purposes, including acquisitions of businesses, share repurchases and working capital requirements. As of June 30, 2018 , the fair value of our credit facility approximates its book value. The credit facility consists of a $600 million revolving loan commitment. The loan commitment may be increased by an additional $500 million (in the form of revolving loans or term loans, or a combination thereof) if the existing or additional lenders are willing to make such increased commitments. The revolving loan commitment does not require amortization of principal and may be repaid in whole or in part prior to the scheduled maturity date at our option without penalty or premium. The credit facility matures on September 15, 2019, when all remaining amounts outstanding will be due and payable in full. PTC and certain eligible foreign subsidiaries may borrow under the credit facility. Any borrowings by PTC Inc. under the credit facility would be guaranteed by PTC Inc.’s material domestic subsidiaries that become parties to the subsidiary guaranty, if any. As of the filing of this Form 10-Q, there are no subsidiary guarantors of the obligations under the credit facility. Any borrowings by eligible foreign subsidiary borrowers would be guaranteed by PTC Inc. and any subsidiary guarantors. In addition, PTC's and certain of its material domestic subsidiaries' owned property (including equity interests) is subject to first priority perfected liens in favor of the lenders of this credit facility. 100% of the voting equity interests of certain of PTC’s domestic subsidiaries and 65% of its material first-tier foreign subsidiaries are pledged as collateral for the obligations under the credit facility. As of June 30, 2018 , we had $198.1 million in loans outstanding under the credit facility. Loans under the credit facility bear interest at variable rates which reset every 30 to 180 days depending on the rate and period selected by PTC as described below. As of June 30, 2018 , the annual interest rate for borrowings outstanding was 3.88% . Interest rates on borrowings outstanding under the credit facility range from 1.25% to 1.75% above an adjusted LIBO rate for Euro currency borrowings or would range from 0.25% to 0.75% above the defined base rate (the greater of the Prime Rate, the FRBNY rate plus 0.5% , or an adjusted LIBO rate plus 1% ) for base rate borrowings, in each case based upon PTC’s total leverage ratio. Additionally, PTC may borrow certain foreign currencies at rates set in the same range above the respective London interbank offered interest rates for those currencies, based on PTC’s total leverage ratio. A quarterly commitment fee on the undrawn portion of the credit facility is required, ranging from 0.175% to 0.30% per annum based upon PTC’s total leverage ratio. The credit facility limits PTC’s and its subsidiaries’ ability to, among other things: incur liens or guarantee obligations; pay dividends (other than to PTC) and make other distributions; make investments and enter into joint ventures; dispose of assets; and engage in transactions with affiliates, except on an arms-length basis. Under the credit facility, PTC and its material domestic subsidiaries may not invest cash or property in, or loan to, PTC’s foreign subsidiaries in aggregate amounts exceeding $75.0 million for any purpose and an additional $200.0 million for acquisitions of businesses. In addition, under the credit facility, PTC and its subsidiaries must maintain the following financial ratios: • a total leverage ratio, defined as consolidated total indebtedness to the consolidated trailing four quarters EBITDA, not to exceed 4.50 to 1.00 as of the last day of any fiscal quarter; • a senior secured leverage ratio, defined as senior consolidated total indebtedness (which excludes unsecured indebtedness) to the consolidated trailing four quarters EBITDA, not to exceed 3.00 to 1.00 as of the last day of any fiscal quarter; and • a fixed charge coverage ratio, defined as the ratio of consolidated trailing four quarters EBITDA less consolidated capital expenditures to consolidated fixed charges, of not less than 3.50 to 1.00 as of the last day of any fiscal quarter. As of June 30, 2018 , our total leverage ratio was 2.45 to 1.00 , our senior secured leverage ratio was 0.73 to 1.00 and our fixed charge coverage ratio was 6.82 to 1.00 and we were in compliance with all financial and operating covenants of the credit facility. Any failure to comply with the financial or operating covenants of the credit facility would prevent PTC from being able to borrow additional funds, and would constitute a default, permitting the lenders to, among other things, accelerate the amounts outstanding, including all accrued interest and unpaid fees, under the credit facility and to terminate the credit facility. A change in control of PTC, as defined in the agreement, also constitutes an event of default, permitting the lenders to accelerate the indebtedness and terminate the credit facility.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal and Regulatory Matters Korean Tax Audit In July 2016, we received an assessment of approximately $12 million from the tax authorities in Korea related to an ongoing tax audit. See Note 11. Income Taxes for additional information. Legal Proceedings We are subject to various other legal proceedings and claims that arise in the ordinary course of business. We do not believe that resolving the legal proceedings and claims that we are currently subject to will have a material adverse impact on our financial condition, results of operations or cash flows. However, the results of legal proceedings cannot be predicted with certainty. Should any of these legal proceedings and claims be resolved against us, the operating results for a reporting period could be adversely affected. Accruals With respect to legal proceedings and claims, we record an accrual for a contingency when it is probable that a liability has been incurred and the amount of the loss can be reasonably estimated. For legal proceedings and claims for which the likelihood that a liability has been incurred is more than remote but less than probable, we estimate the range of possible outcomes. As of June 30, 2018 , we estimate approximately $1.1 million to $3.1 million in legal proceedings and claims, of which we had accrued $1.0 million . Accounts Receivable Accounts receivable as of June 30, 2018 includes an amount invoiced under a multi-year contract for which the period of performance, and related revenue recognized, has spanned a number of years (with no revenue recognized since the first quarter of 2017). The invoiced amount is being disputed by the customer. If we are unable to reach a mutual business resolution, we intend to vigorously pursue collection of the full invoiced amount. If we are unsuccessful in collecting the full invoiced amount, there could be a write-down of accounts receivable and professional services revenue, which could range from $0 to $17.3 million . Guarantees and Indemnification Obligations We enter into standard indemnification agreements in the ordinary course of our business. Under such agreements with our business partners or customers, we indemnify, hold harmless, and agree to reimburse the indemnified party for losses suffered or incurred by the indemnified party, generally in connection with patent, copyright or other intellectual property infringement claims by any third party with respect to our products, as well as claims relating to property damage or personal injury resulting from the performance of services by us or our subcontractors. The maximum potential amount of future payments we could be required to make under these indemnification agreements is unlimited. Historically, our costs to defend lawsuits or settle claims relating to such indemnity agreements have been minimal and, accordingly, we believe the estimated fair value of liabilities under these agreements is immaterial. We warrant that our software products will perform in all material respects in accordance with our standard published specifications in effect at the time of delivery of the licensed products for a specified period of time. Additionally, we generally warrant that our consulting services will be performed consistent with generally accepted industry standards. In most cases, liability for these warranties is capped. If necessary, we would provide for the estimated cost of product and service warranties based on specific warranty claims and claim history; however, we have not incurred significant cost under our product or services warranties. As a result, we believe the estimated fair value of these liabilities is immaterial.

Subsequent Events Subsequent Ev

Subsequent Events Subsequent Events	9 Months Ended
	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Investment in PTC As part of a strategic partnership, on July 19, 2018, Rockwell Automation made a $1,000 million equity investment in PTC, by acquiring 10,582,010 shares at a price of $94.50 per share, which represented a premium over our closing share price on June 11, 2018, the date upon which we entered into a securities purchase agreement. The Chairman and CEO of Rockwell Automation has joined PTC's board of directors. Share Repurchases We entered into a $1,000 million accelerated share repurchase ("ASR") agreement with a major financial institution ("Bank") on July 20, 2018. We used cash proceeds from the Rockwell Automation investment to fund the repurchase. On July 20, 2018, 8,244,873 shares repurchased at the market price of $97.03 per share were delivered to us (totaling $800 million ). The remaining $200 million represents the amount held back by the Bank pending final settlement of the ASR. Upon settlement of the ASR, the total shares repurchased by us will equal up to $1,000 million divided by a share price equal to the average daily volume weighted-average price of our common stock during the term of the ASR program less a fixed per share discount. Final settlement of the ASR will occur between 7.5-months and 10 -months after execution, at the Bank's discretion. All shares repurchased are automatically restored to the status of authorized and unissued.

Restructuring and Other Charg22

Restructuring and Other Charges (Tables)	9 Months Ended
	Jun. 30, 2018
Restructuring [Abstract]
Restructuring Accrual Activity	The following table summarizes restructuring accrual activity for the nine months ended June 30, 2018 : Employee severance and related benefits Facility closures and related costs Total (in thousands) October 1, 2017 $ 1,736 $ 4,508 $ 6,244 Credit to operations, net (509 ) (505 ) (1,014 ) Cash disbursements (1,247 ) (1,207 ) (2,454 ) Foreign exchange impact 20 (80 ) (60 ) Accrual, June 30, 2018 $ — $ 2,716 $ 2,716 The following table summarizes restructuring accrual activity for the nine months ended July 1, 2017 : Employee severance and related benefits Facility closures and related costs Total (in thousands) October 1, 2016 $ 35,177 $ 1,431 $ 36,608 Charges to operations, net 2,582 5,718 8,300 Cash disbursements (33,979 ) (1,351 ) (35,330 ) Other non-cash charges — (704 ) (704 ) Foreign exchange impact (800 ) 98 (702 ) Accrual, July 1, 2017 $ 2,980 $ 5,192 $ 8,172

Stock-based Compensation (Table

Stock-based Compensation (Tables)	9 Months Ended
	Jun. 30, 2018
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]
Schedule of Restricted Stock and Restricted Stock Unit Activity	Restricted stock unit activity for the nine months ended June 30, 2018 Shares Weighted Average Grant Date Fair Value (Per Share) (in thousands) Balance of outstanding restricted stock units October 1, 2017 3,487 $ 45.57 Granted (1) 2,167 $ 75.99 Vested (1,804 ) $ 43.94 Forfeited or not earned (531 ) $ 50.95 Balance of outstanding restricted stock units June 30, 2018 3,319 $ 65.48 _________________ (1) Restricted stock granted includes 184,000 shares from prior period TSR awards that were earned upon achievement of the performance criteria and vested in November 2018.
Schedule of Restricted Stock Unit Grants for the Period	Restricted Stock Units Grant Period Performance-based RSUs (1) Service-based RSUs (2) (Number of Units in thousands) First nine months of 2018 961 1,022 _________________ (1) Substantially all the performance-based RSUs were granted to our executive officers. Approximately 189,000 shares are eligible to vest based upon annual performance measures, measured over a three -year period. RSUs not earned for a period may be earned in the third period. An additional 250,000 shares are eligible to vest based upon a 2018 performance measure. To the extent earned, those performance-based RSUs will vest in three substantially equal installments on November 15, 2018, November 15, 2019 and November 15, 2020, or the date the Compensation Committee determines the extent to which the applicable performance criteria have been achieved for each performance period. An additional 500,000 shares are eligible to vest based upon annual performance measures, measured over a three -year period in fiscal years 2021, 2022 and 2023. RSUs not earned for a period may be earned in the third period. (2) The service-based RSUs were granted to employees, our executive officers and our directors. Substantially all service-based RSUs will vest in three substantially equal annual installments on or about the anniversary of the date of grant.
Schedule of Classification of Compensation Expense	Compensation expense recorded for our stock-based awards was classified in our Consolidated Statements of Operations as follows: Three months ended Nine months ended June 30, July 1, June 30, July 1, (in thousands) Cost of license and subscription revenue $ 421 $ 347 $ 1,242 $ 954 Cost of support revenue 527 1,139 2,025 3,638 Cost of professional services revenue 1,471 1,505 4,846 4,500 Sales and marketing 4,910 3,296 14,827 11,047 Research and development 3,283 2,805 9,626 9,753 General and administrative 6,046 7,482 19,449 26,247 Total stock-based compensation expense $ 16,658 $ 16,574 $ 52,015 $ 56,139

Earnings per Share (EPS) and 24

Earnings per Share (EPS) and Common Stock (Tables)	9 Months Ended
	Jun. 30, 2018
Earnings Per Share and Common Stock
Earnings(loss) per Share Basic and Diluted	Three months ended Nine months ended Calculation of Basic and Diluted EPS June 30, July 1, June 30, July 1, (in thousands, except per share data) Net income (loss) $ 16,997 $ (951 ) $ 38,796 $ (11,196 ) Weighted average shares outstanding—Basic 115,774 115,615 115,915 115,511 Dilutive effect of restricted stock units 1,726 — 1,772 — Weighted average shares outstanding—Diluted 117,500 115,615 117,687 115,511 Earnings (loss) per share—Basic $ 0.15 $ (0.01 ) $ 0.33 $ (0.10 ) Earnings (loss) per share—Diluted $ 0.14 $ (0.01 ) $ 0.33 $ (0.10 )

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Acquired Intangible Assets	Goodwill and acquired intangible assets consisted of the following: June 30, 2018 September 30, 2017 Gross Carrying Amount Accumulated Amortization Net Book Value Gross Carrying Amount Accumulated Amortization Net Book Value (in thousands) Goodwill (not amortized) $ 1,182,462 $ 1,182,772 Intangible assets with finite lives (amortized) (1): Purchased software $ 362,992 $ 247,694 $ 115,298 $ 362,955 $ 228,377 $ 134,578 Capitalized software 22,877 22,877 — 22,877 22,877 — Customer lists and relationships 357,904 262,982 94,922 359,932 241,554 118,378 Trademarks and trade names 19,080 14,643 4,437 19,138 14,186 4,952 Other 4,013 4,013 — 4,030 4,030 — $ 766,866 $ 552,209 $ 214,657 $ 768,932 $ 511,024 $ 257,908 Total goodwill and acquired intangible assets $ 1,397,119 $ 1,440,680 (1) The weighted-average useful lives of purchased software, customer lists and relationships, and trademarks and trade names with a remaining net book value are 9 years, 10 years, and 10 years, respectively.
Schedule of Goodwill	Changes in goodwill presented by reportable segments were as follows: Software Products Professional Services Total (in thousands) Balance, October 1, 2017 $ 1,152,917 $ 29,855 $ 1,182,772 Acquisition 4,350 — 4,350 Foreign currency translation adjustment (4,542 ) (118 ) (4,660 ) Balance, June 30, 2018 $ 1,152,725 $ 29,737 $ 1,182,462
Amortization of Intangible Assets	The aggregate amortization expense for intangible assets with finite lives was classified in our Consolidated Statements of Operations as follows: Three months ended Nine months ended June 30, July 1, June 30, July 1, (in thousands) Amortization of acquired intangible assets $ 7,850 $ 7,973 $ 23,566 $ 23,986 Cost of license and subscription revenue 6,798 6,517 20,029 19,294 Total amortization expense $ 14,648 $ 14,490 $ 43,595 $ 43,280

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value, by Balance Sheet Grouping	Our significant financial assets and liabilities measured at fair value on a recurring basis as of June 30, 2018 and September 30, 2017 were as follows: June 30, 2018 Level 1 Level 2 Level 3 Total (in thousands) Financial assets: Cash equivalents $ 85,382 $ — $ — $ 85,382 Marketable securities Certificates of deposit — 219 — 219 Corporate notes/bonds 52,962 — — 52,962 U.S. government agency securities — 991 — 991 Forward contracts — 4,956 — 4,956 $ 138,344 $ 6,166 $ — $ 144,510 Financial liabilities: Contingent consideration related to acquisitions $ — $ — $ 2,100 $ 2,100 Forward contracts — 1,190 — 1,190 $ — $ 1,190 $ 2,100 $ 3,290 September 30, 2017 Level 1 Level 2 Level 3 Total (in thousands) Financial assets: Cash equivalents $ 49,845 $ — $ — $ 49,845 Marketable securities Certificates of deposit — 240 — 240 Corporate notes/bonds 47,673 — — 47,673 U.S. government agency securities — 2,402 — 2,402 Forward contracts — 1,163 — 1,163 $ 97,518 $ 3,805 $ — $ 101,323 Financial liabilities: Contingent consideration related to acquisitions $ — $ — $ 8,400 $ 8,400 Forward contracts — 4,347 — 4,347 $ — $ 4,347 $ 8,400 $ 12,747
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	Changes in the fair value of Level 3 contingent consideration liability associated with our acquisitions were as follows: Contingent Consideration (in thousands) Kepware Other Total Balance, October 1, 2017 $ 8,400 $ — $ 8,400 Addition to contingent consideration — 2,100 2,100 Payment of contingent consideration (8,400 ) — (8,400 ) Balance, June 30, 2018 $ — $ 2,100 $ 2,100 Contingent Consideration (in thousands) ColdLight Kepware Total Balance, October 1, 2016 $ 2,500 $ 17,070 $ 19,570 Change in present value of contingent consideration — 392 392 Payment of contingent consideration (2,500 ) (9,600 ) (12,100 ) Balance, July 1, 2017 $ — $ 7,862 $ 7,862

Marketable Securities (Tables)

Marketable Securities (Tables)	9 Months Ended
	Jun. 30, 2018
Marketable Securities [Abstract]
Marketable Securities	The amortized cost and fair value of marketable securities as of June 30, 2018 and September 30, 2017 were as follows: June 30, 2018 Amortized cost Gross unrealized gains Gross unrealized losses Fair value (in thousands) Certificates of deposit $ 221 $ — $ (2 ) $ 219 Corporate notes/bonds 53,474 — (512 ) 52,962 U.S. government agency securities 1,000 — (9 ) 991 $ 54,695 $ — $ (523 ) $ 54,172 September 30, 2017 Amortized cost Gross unrealized gains Gross unrealized losses Fair value (in thousands) Certificates of deposit $ 240 $ — $ — $ 240 Corporate notes/bonds 47,811 2 (140 ) 47,673 U.S. government agency securities 2,407 — (5 ) 2,402 $ 50,458 $ 2 $ (145 ) $ 50,315
Unrealized Gain (Loss) on Investments	The following tables summarize the fair value and gross unrealized losses aggregated by category and the length of time that individual securities have been in a continuous unrealized loss position as of June 30, 2018 and September 30, 2017 . June 30, 2018 Less than twelve months Greater than twelve months Total Fair Value Gross unrealized loss Fair Value Gross unrealized loss Fair Value Gross unrealized loss (in thousands) Certificates of deposit $ 219 $ (2 ) $ — $ — $ 219 $ (2 ) Corporate notes/bonds 31,516 (358 ) 21,446 (154 ) 52,962 (512 ) U.S. government agency securities — — 991 (9 ) 991 (9 ) $ 31,735 $ (360 ) $ 22,437 $ (163 ) $ 54,172 $ (523 ) September 30, 2017 Less than twelve months Greater than twelve months Total Fair Value Gross unrealized loss Fair Value Gross unrealized loss Fair Value Gross unrealized loss (in thousands) Certificates of deposit $ 240 $ — $ — $ — $ 240 $ — Corporate notes/bonds 15,254 (43 ) 28,885 (97 ) 44,139 (140 ) U.S. government agency securities — — 2,402 (5 ) 2,402 (5 ) $ 15,494 $ (43 ) $ 31,287 $ (102 ) $ 46,781 $ (145 )
Investments Classified by Contractual Maturity Date	The following table presents our available-for-sale marketable securities by contractual maturity date as of June 30, 2018 and September 30, 2017 . June 30, 2018 September 30, 2017 Amortized cost Fair value Amortized cost Fair value (in thousands) (in thousands) Due in one year or less $ 22,300 $ 22,170 $ 18,274 $ 18,244 Due after one year through three years 32,395 32,002 32,184 32,071 $ 54,695 $ 54,172 $ 50,458 $ 50,315

Derivative Financial Instrume28

Derivative Financial Instruments (Tables)	9 Months Ended
	Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Notional Amounts of Outstanding Forward Contracts	As of June 30, 2018 and September 30, 2017 , we had outstanding forward contracts with notional amounts equivalent to the following: Currency Hedged June 30, September 30, (in thousands) Australian / U.S. Dollar $ 3,226 $ 1,585 Canadian / U.S. Dollar 7,421 12,809 Swiss Franc / Euro — 7,157 Chinese Yuan offshore / Euro — 10,423 Euro / U.S. Dollar 309,733 244,000 Japanese Yen / Euro — 17,694 Israeli Shekel / U.S. Dollar 7,677 8,820 Japanese Yen / U.S. Dollar 18,152 3,198 Swedish Krona / U.S. Dollar 8,568 4,627 Danish Krona / U.S. Dollar 2,645 1,743 Hong Kong / U.S. Dollar 2,628 915 All other 8,151 5,548 Total $ 368,201 $ 318,519 As of June 30, 2018 and September 30, 2017 , we had outstanding forward contracts designated as cash flow hedges with notional amounts equivalent to the following: Currency Hedged June 30, September 30, (in thousands) Euro / U.S. Dollar $ 44,699 $ 64,831 Japanese Yen / U.S. Dollar 11,830 22,675 SEK / U.S. Dollar 10,521 14,091 Total $ 67,050 $ 101,597
Net Gains and Losses on Foreign Currency Exposures	The following table shows the effect of our non-designated hedges in the Consolidated Statements of Operations for the three and nine months ended June 30, 2018 and July 1, 2017 : Derivatives Not Designated as Hedging Instruments Location of Gain or (Loss) Recognized in Income Net realized and unrealized gain or (loss) (excluding the underlying foreign currency exposure being hedged) Three months ended Nine months ended June 30, July 1, June 30, July 1, (in thousands) Forward Contracts Interest income and other expense, net $ (9,392 ) $ 6,669 $ (6,370 ) $ (1,422 ) The following table shows the effect of our derivative instruments designated as cash flow hedges in the Consolidated Statements of Operations for the three and nine months ended June 30, 2018 and July 1, 2017 (in thousands): Derivatives Designated as Hedging Instruments Gain or (Loss) Recognized in OCI-Effective Portion Location of Gain or (Loss) Reclassified from OCI into Income-Effective Portion Gain or (Loss) Reclassified from OCI into Income-Effective Portion Location of Gain or (Loss) Recognized-Ineffective Portion Gain or (Loss) Recognized-Ineffective Portion Three months ended Three months ended Three months ended June 30, July 1, June 30, July 1, June 30, July 1, Forward Contracts $ 4,468 $ (2,627 ) Subscription, support and license revenue $ (277 ) $ (86 ) Interest income and other expense, net $ 52 $ (29 ) Nine months ended Nine months ended Nine months ended June 30, July 1, June 30, July 1, June 30, July 1, Forward Contracts $ 1,086 $ 256 Subscription, support and license revenue $ (2,659 ) $ 888 Interest income and other expense, net $ 17 $ (23 )
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The following table shows our derivative instruments measured at gross fair value as reflected in the Consolidated Balance Sheets: Fair Value of Derivatives Designated As Hedging Instruments Fair Value of Derivatives Not Designated As Hedging Instruments June 30, September 30, June 30, September 30, (in thousands) (in thousands) Derivative assets (1): Forward Contracts $ 1,994 $ 540 $ 2,962 $ 623 Derivative liabilities (2): Forward Contracts $ 16 $ 2,352 $ 1,174 $ 1,995 (1) As of June 30, 2018, $4,956 thousand current derivative assets are recorded in other current assets, in the Consolidated Balance Sheets. As of September 30, 2017, $1,128 thousand current derivative assets are recorded in other current assets, and $35 thousand long-term derivative assets are recorded in other assets in the Consolidated Balance Sheets. (2) As of June 30, 2018, $1,190 thousand current derivative liabilities are recorded in accrued expenses and other current liabilities in the Consolidated Balance Sheets. As of September 30, 2017, $4,329 thousand current derivative liabilities are recorded in accrued expenses and other current liabilities, and $18 thousand long term derivative liabilities are recorded in other liabilities in the Consolidated Balance Sheets.
Offsetting Assets	The following table sets forth the offsetting of derivative assets as of June 30, 2018 : Gross Amounts Offset in the Consolidated Balance Sheets Gross Amounts Not Offset in the Consolidated Balance Sheets As of June 30, 2018 Gross Amount of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Assets Presented in the Consolidated Balance Sheets Financial Instruments Cash Collateral Received Net Amount (in thousands) Forward Contracts $ 4,956 $ — $ 4,956 $ (1,190 ) $ — $ 3,766
Offsetting Liabilities	The following table sets forth the offsetting of derivative liabilities as of June 30, 2018 : Gross Amounts Offset in the Consolidated Balance Sheets Gross Amounts Not Offset in the Consolidated Balance Sheets As of June 30, 2018 Gross Amount of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Liabilities Presented in the Consolidated Balance Sheets Financial Instruments Cash Collateral Pledged Net Amount (in thousands) Forward Contracts $ 1,190 $ — $ 1,190 $ (1,190 ) $ — $ —

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Revenue and Operating Income	The revenue and profit attributable to our operating segments are summarized below. We do not produce asset information by reportable segment; therefore, it is not reported. Three months ended Nine months ended June 30, July 1, June 30, July 1, (in thousands) Software Products Revenue $ 273,619 $ 247,635 $ 801,262 $ 722,724 Operating Costs (1) 96,422 94,325 293,417 273,196 Profit 177,197 153,310 507,845 449,528 Professional Services Revenue 41,158 43,658 128,041 134,936 Operating Costs (2) 33,945 35,588 104,634 110,681 Profit 7,213 8,070 23,407 24,255 Total segment revenue 314,777 291,293 929,303 857,660 Total segment costs 130,367 129,913 398,051 383,877 Total segment profit 184,410 161,380 531,252 473,783 Unallocated operating expenses: Sales and marketing expenses 102,831 89,805 290,559 260,521 General and administrative expenses 25,458 27,263 80,272 81,270 Restructuring and headquarters relocation charges, net 1,627 1,551 1,846 8,300 Intangibles amortization 14,648 14,490 43,595 43,280 Stock-based compensation 16,658 16,574 52,015 56,139 Other unallocated operating expenses (3) 1,485 441 1,425 943 Total operating income 21,703 11,256 61,540 23,330 Interest expense (10,646 ) (10,200 ) (31,072 ) (32,239 ) Interest income and other expense, net (1,086 ) (357 ) (2,481 ) 2,049 Income (loss) before income taxes $ 9,971 $ 699 $ 27,987 $ (6,860 ) (1) Operating costs for the Software Products segment includes all cost of software revenue and research and development costs, excluding stock-based compensation and intangible amortization. (2) Operating costs for the Professional Services segment includes all cost of professional services revenue, excluding stock-based compensation, intangible amortization, and fair value adjustments for deferred services costs. (3) Other unallocated operating expenses include acquisition-related and other transactional costs, pension plan termination-related costs and fair value adjustments for deferred services costs.

Debt Debt (Tables)

Debt Debt (Tables)	9 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Schedule of Debt	At June 30, 2018 and September 30, 2017 , we had the following long-term debt obligations: June 30, September 30, (in thousands) 6.000% Senior notes due 2024 $ 500,000 $ 500,000 Credit facility revolver 198,125 218,125 Total debt 698,125 718,125 Unamortized debt issuance costs for the Senior notes (1) (5,072 ) (5,719 ) Total debt, net of issuance costs (2) $ 693,053 $ 712,406 (1) Unamortized debt issuance costs related to the credit facility were $1.3 million and $2.0 million as of June 30, 2018 and September 30, 2017, respectively, and were included in other assets. (2) As of June 30, 2018 and September 30, 2017, all debt was included in long-term debt.

Basis of Presentation (Details)

Basis of Presentation (Details) $ in Millions	9 Months Ended		12 Months Ended
	Jun. 30, 2018USD ($)Segment	Jul. 01, 2017USD ($)	Sep. 30, 2017Segment	Oct. 01, 2017USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments | Segment	2		3
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Windfall Tax Deductions Not Yet Recognized				$ 37
Windfall Tax Deductions Not Yet Recognized Offset Valuation Allowance				36.9
Excess Tax Benefit from Share-based Compensation, Operating Activities		$ 0.4
Excess tax benefits realized from stock-based awards		$ 0.4
forfeiture adjustment				$ 0.7
Accounting Standards Update 2016-16 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Tax Assets, Other	$ 77

Deferred Revenue and Related 32

Deferred Revenue and Related Customer Receivables (Details) - USD ($) $ in Millions	Jun. 30, 2018	Sep. 30, 2017
Other Assets
Deferred Revenue and Financing Receivables [Line Items]
Billed but uncollected support and subscription related receivable	$ 108.7	$ 160.9

Restructuring and Other Charg33

Restructuring and Other Charges - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended		32 Months Ended
	Jun. 30, 2018USD ($)	Jul. 01, 2017USD ($)	Jun. 30, 2018USD ($)	Jul. 01, 2017USD ($)	Jun. 30, 2018USD ($)employee
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges, net	$ 1,627	$ 1,551	$ 1,846	$ 8,300	$ 84,500
Restructuring and Related Cost, Number of Positions Eliminated | employee					800
Headquarters relocation charges	1,900		2,900
Facility closures and related costs
Restructuring Cost and Reserve [Line Items]
Assumed Sublease Income	3,100		3,100		$ 3,100
Accrued Expenses and Other Current Liabilities [Member] | Facility closures and related costs
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1,600		1,600		1,600
Other Noncurrent Liabilities [Member] | Facility closures and related costs
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 1,100		$ 1,100		$ 1,100

Restructuring and Other Charg34

Restructuring and Other Charges - Schedule of Restructuring Reserve (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		32 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018
Restructuring Reserve [Roll Forward]
Credit to operations, net	$ 1,627	$ 1,551	$ 1,846	$ 8,300	$ 84,500
Restructuring Plan 2016 [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			6,244	36,608
Credit to operations, net			(1,014)	8,300
Cash disbursements			(2,454)	(35,330)
Other non-cash charges				(704)
Foreign exchange impact			(60)	(702)
Restructuring reserve, ending balance	2,716	8,172	2,716	8,172	2,716
Restructuring Plan 2016 [Member] | Employee severance and related benefits
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			1,736	35,177
Credit to operations, net			(509)	2,582
Cash disbursements			(1,247)	(33,979)
Other non-cash charges				0
Foreign exchange impact			20	(800)
Restructuring reserve, ending balance	0	2,980	0	2,980	0
Restructuring Plan 2016 [Member] | Facility closures and related costs
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			4,508	1,431
Credit to operations, net			(505)	5,718
Cash disbursements			(1,207)	(1,351)
Other non-cash charges				(704)
Foreign exchange impact			(80)	98
Restructuring reserve, ending balance	$ 2,716	$ 5,192	$ 2,716	$ 5,192	$ 2,716

Stock-based Compensation (Narra

Stock-based Compensation (Narrative) (Details)	3 Months Ended		9 Months Ended
	Jun. 30, 2018USD ($)shares / unit	Jul. 01, 2017USD ($)	Jun. 30, 2018USD ($)shares / unit	Jul. 01, 2017USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Common Stock Issuable per Restricted Stock Unit | shares / unit	1		1
ESPP maximum contribution percentage	10.00%		10.00%
ESPP maximum contribution amount by employee			$ 25,000
ESPP purchase price as a % of stock price	85.00%		85.00%
Stock-based compensation	$ 16,658,000	$ 16,574,000	$ 52,015,000	$ 56,139,000
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 1,100,000	$ 900,000	$ 3,200,000	$ 2,200,000

Stock-based Compensation (Sched

Stock-based Compensation (Schedule of Restricted Stock Unit Activity) (Details) - Restricted Stock Units (RSUs) shares in Thousands	9 Months Ended
	Jun. 30, 2018$ / sharesshares
Shares
Balance of outstanding restricted stock units, beginning, Shares | shares	3,487
Granted, shares | shares	2,167
Vested, Shares | shares	(1,804)
Forfeited or not earned, Shares | shares	(531)
Balance of outstanding restricted stock units, ending, Shares | shares	3,319
Weighted Average Grant Date Fair Value (Per Share)
Balance of outstanding restricted stock units, beginning (in USD per share) | $ / shares	$ 45.57
Granted (in USD per share) | $ / shares	75.99
Vested (in USD per share) | $ / shares	43.94
Forfeited or not earned (in USD per share) | $ / shares	50.95
Balance of outstanding restricted stock units, ending (in USD per share) | $ / shares	$ 65.48

Stock-based Compensation (Sch37

Stock-based Compensation (Schedule of Restricted Stock Unit Grants For The Period) (Details) shares in Thousands	9 Months Ended
	Jun. 30, 2018installmentshares
TSR Units [Member]
Granted, shares	184
Performance-Based Restricted Stock Units [Member]
Granted, shares	961
Award vesting period	3 years
Number of equal annual installments | installment	3
Service-Based Restricted Stock Units [Member]
Granted, shares	1,022
Number of equal annual installments | installment	3
Maximum | Performance-Based Restricted Stock Units [Member]
Granted, shares	500
Catch-Up Provision [Member] | Maximum | Performance-Based Restricted Stock Units [Member]
Granted, shares	189
No Catch-Up Provision [Member] | Maximum | Performance-Based Restricted Stock Units [Member]
Granted, shares	250

Stock-based Compensation (Sch38

Stock-based Compensation (Schedule of Classification of Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Total stock-based compensation expense	$ 16,658	$ 16,574	$ 52,015	$ 56,139
Cost of license and subscription revenue
Total stock-based compensation expense	421	347	1,242	954
Cost of support revenue
Total stock-based compensation expense	527	1,139	2,025	3,638
Cost of professional services revenue
Total stock-based compensation expense	1,471	1,505	4,846	4,500
Sales and marketing
Total stock-based compensation expense	4,910	3,296	14,827	11,047
Research and development
Total stock-based compensation expense	3,283	2,805	9,626	9,753
General and administrative
Total stock-based compensation expense	$ 6,046	$ 7,482	$ 19,449	$ 26,247

Earnings per Share (EPS) and 39

Earnings per Share (EPS) and Common Stock (Earnings per Share Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Earnings Per Share and Common Stock
Net income (loss)	$ 16,997	$ (951)	$ 38,796	$ (11,196)
Weighted average shares outstanding—Basic (in shares)	115,774	115,615	115,915	115,511
Dilutive effect of employee stock options, restricted shares and restricted stock units (in shares)	1,726	0	1,772	0
Weighted average shares outstanding—Diluted (in shares)	117,500	115,615	117,687	115,511
Earnings(loss) per share—Basic (in USD per share)	$ 0.15	$ (0.01)	$ 0.33	$ (0.10)
Earnings(loss) per share—Diluted (in USD per share)	$ 0.14	$ (0.01)	$ 0.33	$ (0.10)

Earnings per Share (EPS) and 40

Earnings per Share (EPS) and Common Stock (Narrative) (Details) - USD ($) shares in Millions	Jul. 20, 2018	Jun. 30, 2018	Jul. 01, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Stock option restricted shares and restricted stock units excluded from computation of EPS, shares		0.1	2
Stock Repurchase Program, Authorized Amount		$ 500,000,000
Payments for Repurchase of Common Stock		$ 100,000,000	$ 34,994,000
Subsequent Event [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Stock Repurchase Program, Authorized Amount	$ 1,000,000,000
Accelerated Share Repurchases, Settlement (Payment) or Receipt	$ 1,000,000,000
Minimum [Member] | Subsequent Event [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Accelerated Share Repurchase Settlement Period	7 months 15 days
Maximum [Member] | Subsequent Event [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Accelerated Share Repurchase Settlement Period	10 months

Goodwill and Intangible Asset41

Goodwill and Intangible Assets (Narrative) (Details) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2018USD ($)Segment	Jun. 30, 2018USD ($)Segment	Sep. 30, 2017USD ($)Segment
Number of operating segments | Segment		2	3
Number of reportable segments | Segment	2		3
Intangible Assets, Net (Including Goodwill)	$ 1,397,119	$ 1,397,119	$ 1,440,680
Foreign currency translation adjustment		(4,660)
Goodwill	1,182,462	1,182,462	1,182,772
Professional Services
Intangible Assets, Net (Including Goodwill)	30,300	30,300	30,600
Foreign currency translation adjustment		(118)
Goodwill	29,737	29,737	29,855
Software Products
Intangible Assets, Net (Including Goodwill)	1,366,800	1,366,800	1,410,000
Foreign currency translation adjustment		(4,542)
Goodwill	$ 1,152,725	$ 1,152,725	$ 1,152,917

Goodwill and Intangible Asset42

Goodwill and Intangible Assets (Goodwill and Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2018	Sep. 30, 2017
Goodwill (not amortized), Net Book Value	$ 1,182,462	$ 1,182,772
Intangible assets with finite lives (amortized), Gross Carrying Amount	766,866	768,932
Intangible assets with finite lives (amortized), Accumulated Amortization	552,209	511,024
Intangible assets with finite lives (amortized), Net Book Value	214,657	257,908
Intangible Assets, Net (Including Goodwill)	1,397,119	1,440,680
Purchased software
Intangible assets with finite lives (amortized), Gross Carrying Amount	362,992	362,955
Intangible assets with finite lives (amortized), Accumulated Amortization	247,694	228,377
Intangible assets with finite lives (amortized), Net Book Value	$ 115,298	134,578
Acquired finite-lived intangible asset, weighted average useful life	9 years
Capitalized software
Intangible assets with finite lives (amortized), Gross Carrying Amount	$ 22,877	22,877
Intangible assets with finite lives (amortized), Accumulated Amortization	22,877	22,877
Intangible assets with finite lives (amortized), Net Book Value	0	0
Customer lists and relationships
Intangible assets with finite lives (amortized), Gross Carrying Amount	357,904	359,932
Intangible assets with finite lives (amortized), Accumulated Amortization	262,982	241,554
Intangible assets with finite lives (amortized), Net Book Value	$ 94,922	118,378
Acquired finite-lived intangible asset, weighted average useful life	10 years
Trademarks and trade names
Intangible assets with finite lives (amortized), Gross Carrying Amount	$ 19,080	19,138
Intangible assets with finite lives (amortized), Accumulated Amortization	14,643	14,186
Intangible assets with finite lives (amortized), Net Book Value	$ 4,437	4,952
Acquired finite-lived intangible asset, weighted average useful life	10 years
Other
Intangible assets with finite lives (amortized), Gross Carrying Amount	$ 4,013	4,030
Intangible assets with finite lives (amortized), Accumulated Amortization	4,013	4,030
Intangible assets with finite lives (amortized), Net Book Value	$ 0	$ 0

Goodwill and Intangible Asset43

Goodwill and Intangible Assets (Schedule of Goodwill) (Details) $ in Thousands	9 Months Ended
	Jun. 30, 2018USD ($)
Goodwill [Line Items]
Balance, October 1, 2017	$ 1,182,772
Acquisition	4,350
Foreign currency translation adjustment	(4,660)
Balance, June 30, 2018	1,182,462
Software Products
Goodwill [Line Items]
Balance, October 1, 2017	1,152,917
Acquisition	4,350
Foreign currency translation adjustment	(4,542)
Balance, June 30, 2018	1,152,725
Professional Services
Goodwill [Line Items]
Balance, October 1, 2017	29,855
Acquisition	0
Foreign currency translation adjustment	(118)
Balance, June 30, 2018	$ 29,737

Goodwill and Intangible Asset44

Goodwill and Intangible Assets (Amortization of Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of acquired intangible assets	$ 7,850	$ 7,973	$ 23,566	$ 23,986
Cost of license and subscription revenue	6,798	6,517	20,029	19,294
Total amortization expense	$ 14,648	$ 14,490	$ 43,595	$ 43,280

Fair Value Measurements (Schedu

Fair Value Measurements (Schedule of Financial Assets and Liabilities Measured at Fair Value) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017	Jul. 01, 2017	Sep. 30, 2016
Financial assets:
Cash equivalents	$ 85,382	$ 49,845
Marketable securities	54,172	50,315
Forward contracts	4,956	1,163
Financial assets, fair value	144,510	101,323
Financial liabilities:
Contingent consideration related to acquisitions	2,100	8,400
Forward contracts	1,190	4,347
Liabilities, Fair Value Disclosure, Recurring	3,290	12,747
Level 1
Financial assets:
Cash equivalents	85,382	49,845
Financial assets, fair value	138,344	97,518
Level 2
Financial assets:
Forward contracts	4,956	1,163
Financial assets, fair value	6,166	3,805
Financial liabilities:
Forward contracts	1,190	4,347
Liabilities, Fair Value Disclosure, Recurring	1,190	4,347
Level 3
Financial liabilities:
Contingent consideration related to acquisitions	2,100	8,400	$ 7,862	$ 19,570
Liabilities, Fair Value Disclosure, Recurring	2,100	8,400
Certificates of deposit
Financial assets:
Marketable securities	219	240
Certificates of deposit | Level 2
Financial assets:
Marketable securities	219	240
Corporate notes/bonds
Financial assets:
Marketable securities	52,962	47,673
Corporate notes/bonds | Level 1
Financial assets:
Marketable securities	52,962	47,673
U.S. government agency securities
Financial assets:
Marketable securities	991	2,402
U.S. government agency securities | Level 2
Financial assets:
Marketable securities	$ 991	$ 2,402

Fair Value Measurements (Change

Fair Value Measurements (Changes in Fair Value of Level 3 Contingent Consideration Liability (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017
Business Combination. Contingent Consideration [Roll Forward]
Beginning balance	$ 8,400
Payment of contingent consideration	(8,400)	$ (12,100)
Ending balance	2,100
Level 3
Business Combination. Contingent Consideration [Roll Forward]
Beginning balance	8,400	19,570
Addition to contingent consideration	2,100
Change in present value of contingent consideration		392
Payment of contingent consideration	(8,400)	(12,100)
Ending balance	2,100	7,862
Kepware
Business Combination. Contingent Consideration [Roll Forward]
Ending balance	0
Kepware | Level 3
Business Combination. Contingent Consideration [Roll Forward]
Beginning balance	8,400	17,070
Addition to contingent consideration	0
Change in present value of contingent consideration		392
Payment of contingent consideration	(8,400)	(9,600)
Ending balance	0	7,862
Other | Level 3
Business Combination. Contingent Consideration [Roll Forward]
Beginning balance	0
Addition to contingent consideration	2,100
Payment of contingent consideration	0
Ending balance	$ 2,100
ColdLight | Level 3
Business Combination. Contingent Consideration [Roll Forward]
Beginning balance		2,500
Change in present value of contingent consideration		0
Payment of contingent consideration		(2,500)
Ending balance		$ 0

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended		30 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration related to acquisitions	$ 2,100		$ 2,100	$ 8,400
Payment of contingent consideration	8,400	$ 12,100
Business Combination, Consideration Transferred, Liabilities Incurred	7,800	11,100
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration related to acquisitions	2,100	7,862	2,100	8,400	$ 19,570
Payment of contingent consideration	8,400	12,100
Level 3 | Accrued Expenses and Other Current Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration related to acquisitions	1,100		1,100
Level 3 | Other Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration related to acquisitions	1,000		1,000
Kepware
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration related to acquisitions	0		0
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	18,000		18,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low	16,900		16,900
Payment of contingent consideration			18,000
Kepware | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration related to acquisitions	0	7,862	$ 0	$ 8,400	$ 17,070
Payment of contingent consideration	$ 8,400	$ 9,600

Marketable Securities (Amortize

Marketable Securities (Amortized Cost and Fair Value of Marketable Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 54,695	$ 50,458
Gross unrealized gains	0	2
Gross unrealized losses	(523)	(145)
Fair value	54,172	50,315
Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	221	240
Gross unrealized gains	0	0
Gross unrealized losses	(2)	0
Fair value	219	240
Corporate notes/bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	53,474	47,811
Gross unrealized gains	0	2
Gross unrealized losses	(512)	(140)
Fair value	52,962	47,673
U.S. government agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	1,000	2,407
Gross unrealized gains	0	0
Gross unrealized losses	(9)	(5)
Fair value	$ 991	$ 2,402

Marketable Securities (Schedule

Marketable Securities (Schedule of Fair Value and Gross Unrealized Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 31,735	$ 15,494
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(360)	(43)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	22,437	31,287
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(163)	(102)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	54,172	46,781
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(523)	(145)
Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	219	240
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2)	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	219	240
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(2)	0
Corporate notes/bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	31,516	15,254
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(358)	(43)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	21,446	28,885
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(154)	(97)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	52,962	44,139
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(512)	(140)
U.S. government agency securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	991	2,402
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(9)	(5)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	991	2,402
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (9)	$ (5)

Marketable Securities (Schedu50

Marketable Securities (Schedule of Available-for-sale Marketable Securities by Contractual Maturity Date) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, amortized cost	$ 22,300	$ 18,274
Due in one year or less, fair value	22,170	18,244
Due after one year through three years, amortized cost	32,395	32,184
Due after one year through three years, fair value	32,002	32,071
Amortized cost	54,695	50,458
Fair value	$ 54,172	$ 50,315

Derivative Financial Instrume51

Derivative Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ 2.2	$ 0.7	$ 5.4	$ 3.2
Forward Contracts | Not Designated as Hedging Instrument
Derivative, Remaining Maturity	3 months
Forward Contracts | Designated as Hedging Instrument
Derivative, Remaining Maturity	15 months

Derivative Financial Instrume52

Derivative Financial Instruments (Notional Amounts Of Outstanding Forward Contracts) (Details) - Forward Contracts - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Designated as Hedging Instrument
Notional amounts	$ 67,050	$ 101,597
Designated as Hedging Instrument | Euro / U.S. Dollar
Notional amounts	44,699	64,831
Designated as Hedging Instrument | Japanese Yen / U.S. Dollar
Notional amounts	11,830	22,675
Designated as Hedging Instrument | Swedish Krona / U.S. Dollar
Notional amounts	10,521	14,091
Not Designated as Hedging Instrument
Notional amounts	368,201	318,519
Not Designated as Hedging Instrument | Australia, Dollars
Notional amounts	3,226	1,585
Not Designated as Hedging Instrument | Canadian / U.S. Dollar
Notional amounts	7,421	12,809
Not Designated as Hedging Instrument | Swiss Franc / Euro
Notional amounts	0	7,157
Not Designated as Hedging Instrument | Chinese Yuan offshore / Euro
Notional amounts	0	10,423
Not Designated as Hedging Instrument | Euro / U.S. Dollar
Notional amounts	309,733	244,000
Not Designated as Hedging Instrument | Japanese Yen / Euro
Notional amounts	0	17,694
Not Designated as Hedging Instrument | Israeli Shekel / U.S. Dollar
Notional amounts	7,677	8,820
Not Designated as Hedging Instrument | Japanese Yen / U.S. Dollar
Notional amounts	18,152	3,198
Not Designated as Hedging Instrument | Swedish Krona / U.S. Dollar
Notional amounts	8,568	4,627
Not Designated as Hedging Instrument | Danish Krona / U.S. Dollar
Notional amounts	2,645	1,743
Not Designated as Hedging Instrument | Hong Kong, Dollars
Notional amounts	2,628	915
Not Designated as Hedging Instrument | All other
Notional amounts	$ 8,151	$ 5,548

Derivative Financial Instrume53

Derivative Financial Instruments (Derivative Instruments and Hedging Activities Disclosures) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in OCI-Effective Portion	$ 3,910	$ (2,298)	$ 950	$ 224
Forward Contracts | Designated as Hedging Instrument | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in OCI-Effective Portion	4,468	(2,627)	1,086	256
Forward Contracts | Subscription, support and license revenue | Designated as Hedging Instrument | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Reclassified from OCI into Income-Effective Portion	(277)	(86)	(2,659)	888
Forward Contracts | Interest income and other expense, net | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Net realized and unrealized gain or (loss) (excluding the underlying foreign currency exposure being hedged)	9,392	(6,669)	6,370	1,422
Forward Contracts | Interest income and other expense, net | Designated as Hedging Instrument | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized-Ineffective Portion	$ 52	$ (29)	$ 17	$ (23)

Derivative Financial Instrume54

Derivative Financial Instruments Derivative Financial Instruments (Gross Fair Value) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Derivative [Line Items]
Forward contracts	$ 4,956	$ 1,163
Forward contracts	1,190	4,347
Not Designated as Hedging Instrument | Forward Contracts
Derivative [Line Items]
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	2,962	623
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value	1,174	1,995
Designated as Hedging Instrument | Forward Contracts
Derivative [Line Items]
Foreign Currency Cash Flow Hedge Asset at Fair Value	1,994	540
Foreign Currency Cash Flow Hedge Liability at Fair Value	16	2,352
Other Current Assets [Member] | Forward Contracts
Derivative [Line Items]
Forward contracts	4,956	1,128
Other Noncurrent Assets | Forward Contracts
Derivative [Line Items]
Forward contracts	0	35
Other Current Liabilities [Member] | Forward Contracts
Derivative [Line Items]
Forward contracts	1,190	4,329
Other Noncurrent Liabilities [Member] | Forward Contracts
Derivative [Line Items]
Forward contracts	$ 0	$ 18

Derivative Financial Instrume55

Derivative Financial Instruments (Offsetting Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gross Amount of Recognized Assets	$ 4,956
Gross Amounts Offset in the Consolidated Balance Sheets	0
Net Amounts of Assets Presented in the Consolidated Balance Sheets	4,956	$ 1,163
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	(1,190)
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received	0
Net Amount	$ 3,766

Derivative Financial Instrume56

Derivative Financial Instruments (Offsetting Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gross Amount of Recognized Liabilities	$ 1,190
Gross Amounts Offset in the Consolidated Balance Sheets	0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheets	1,190	$ 4,347
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	(1,190)
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Pledged	0
Net Amount	$ 0

Segment Information (Details)

Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended	32 Months Ended
	Jun. 30, 2018USD ($)Segment	Jul. 01, 2017USD ($)	Jun. 30, 2018USD ($)Segment	Jul. 01, 2017USD ($)	Sep. 30, 2017Segment	Jun. 30, 2018USD ($)
Number of operating segments | Segment			2		3
Number of reportable segments | Segment	2				3
Revenue	$ 314,777	$ 291,293	$ 929,303	$ 857,660
Operating Costs	81,556	82,268	248,145	246,213
Gross margin	233,221	209,025	681,158	611,447
Sales and marketing	107,741	93,101	305,386	271,568
General and administrative	33,082	35,294	101,439	108,789
Restructuring and other charges, net	1,627	1,551	1,846	8,300		$ 84,500
Amortization of acquired intangible assets	7,850	7,973	23,566	23,986
Operating income	21,703	11,256	61,540	23,330
Interest expense	(10,646)	(10,200)	(31,072)	(32,239)
Interest income and other expense, net	1,086	357	2,481	(2,049)
Income (loss) before income taxes	9,971	699	27,987	(6,860)
Operating Segments
Revenue	314,777	291,293	929,303	857,660
Operating Costs	130,367	129,913	398,051	383,877
Gross margin	184,410	161,380	531,252	473,783
Operating Segments | Software Products
Revenue	273,619	247,635	801,262	722,724
Operating Costs	96,422	94,325	293,417	273,196
Gross margin	177,197	153,310	507,845	449,528
Operating Segments | Professional Services
Revenue	41,158	43,658	128,041	134,936
Operating Costs	33,945	35,588	104,634	110,681
Gross margin	7,213	8,070	23,407	24,255
Unallocated
Sales and marketing	102,831	89,805	290,559	260,521
General and administrative	25,458	27,263	80,272	81,270
Restructuring and other charges, net	1,627	1,551	1,846	8,300
Amortization of acquired intangible assets	14,648	14,490	43,595	43,280
Stock-based compensation	16,658	16,574	52,015	56,139
Other unallocated operating expenses	$ 1,485	$ 441	$ 1,425	$ 943

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2016	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Oct. 01, 2017	Sep. 30, 2017
Income Tax Disclosure [Line Items]
Effective income tax rate		(70.00%)	236.00%	(39.00%)	(63.00%)
Income before income taxes		$ 9,971	$ 699	$ 27,987	$ (6,860)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent				21.00%	35.00%
Operating Loss Carryforwards, Limitations on Use				0.8
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount			$ (9,000)		$ (21,000)
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent				24.50%
Unrecognized tax benefits		9,700		$ 9,700			$ 14,800
Income tax provision upon recognition of unrecognized tax benefit		9,700		9,700
Unrecognized tax benefits that would impact valuation allowance		3,800		3,800
Potentail reduction in unrecognized tax benefits and accrued interest over next 12 months		$ (2,000)		(2,000)
Korea
Income Tax Disclosure [Line Items]
Income tax examination, estimate of possible loss	$ 12,000
US Tax on Undistributed Foreign Earnings [Member]
Income Tax Disclosure [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions				5,400
Current Federal, State and Local, Tax Expense (Benefit)				1,700
Net Decrease in Deferred Tax Liability [Member]
Income Tax Disclosure [Line Items]
Deferred Income Tax Expense (Benefit)				$ 14,100
Accounting Standards Update 2016-09 [Member]
Income Tax Disclosure [Line Items]
Windfall Tax Deductions Not Yet Recognized						$ 37,000
Windfall Tax Deductions Not Yet Recognized Offset Valuation Allowance						$ 36,900

Debt (Details)

Debt (Details)	May 15, 2019	Jun. 30, 2018USD ($)	Sep. 30, 2017USD ($)	May 31, 2016USD ($)	Sep. 30, 2015bank
Debt Instrument [Line Items]
Senior Notes		$ 500,000,000	$ 500,000,000	$ 500,000,000
Long-term Debt, Gross		698,125,000	718,125,000
debt net of unamortized debt issuance cost		$ 693,053,000	$ 712,406,000
Debt Instrument, Interest Rate, Stated Percentage		6.00%	6.00%	6.00%
Voting interest in domestic subsidiaries pledged against credit facility		100.00%
Voting interest in foreign subsidiaries pledged against credit facility		65.00%
Leverage Ratio, Actual		2.45
Debt Instrument, Covenant Compliance, Senior Debt Leverage Ratio, actual		0.73
Fixed charge coverage ratio, actual		6.82
Line of Credit [Member]
Debt Instrument [Line Items]
Long-term portion of long term debt		$ 198,125,000	$ 218,125,000
Credit facility amount		600,000,000
Additional borrowing capacity on credit facility if agreed to by lenders		$ 500,000,000
Line of Credit Facility, Interest Rate at Period End		3.88%
Component of Base Rate, Basis Spread on Federal Reserve Bank of New York (FRBNY) rate		0.50%
Component of Base Rate, Basis Spread on Adjusted LIBOR		1.00%
Investment limit in foreign subsidiaries		$ 75,000,000
Cash investment limit for acquisition of business		$ 200,000,000
Debt Instrument, Covenant Compliance, Leverage Ratio Four		4.50
Minimum fixed charge coverage ratio allowed under debt covenant		3.50
Debt Instrument, Covenant Compliance, maximum Senior Debt Leverage Ratio after covenant modification trigger event		3
Line of Credit [Member] | Minimum
Debt Instrument [Line Items]
Line of Credit Facility, Variable Interest Rate, Length of Time Between Updates		30 days
Credit facility commitment fees percentage		0.175%
Line of Credit [Member] | Maximum
Debt Instrument [Line Items]
Line of Credit Facility, Variable Interest Rate, Length of Time Between Updates		180 days
Credit facility commitment fees percentage		0.30%
Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Number of Banks in Credit Facility | bank					16
London Interbank Offered Rate (LIBOR) [Member] | Line of Credit [Member] | Minimum
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.25%
London Interbank Offered Rate (LIBOR) [Member] | Line of Credit [Member] | Maximum
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.75%
Base Rate [Member] | Line of Credit [Member] | Minimum
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.25%
Base Rate [Member] | Line of Credit [Member] | Maximum
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.75%
Scenario, Forecast [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	101.00%
Other Noncurrent Assets | Line of Credit [Member]
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense		$ (1,300,000)	(2,000,000)
Senior Notes [Member]
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense		(5,072,000)	$ (5,719,000)
Debt Instrument, Fair Value Disclosure		$ 520,000,000

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Thousands	1 Months Ended
	Jul. 31, 2016	Jun. 30, 2018	Sep. 30, 2017
Loss Contingencies [Line Items]
Accounts receivable, net of allowance for doubtful accounts of $591 and $1,062 at June 30, 2018 and September 30, 2017, respectively		$ 130,079	$ 152,299
Pending Litigation
Loss Contingencies [Line Items]
Loss contingency accrual		1,000
Korea
Loss Contingencies [Line Items]
Income tax examination, estimate of possible loss	$ 12,000
Minimum | Pending Litigation
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss		1,100
Minimum | Customer Contracts
Loss Contingencies [Line Items]
Accounts receivable, net of allowance for doubtful accounts of $591 and $1,062 at June 30, 2018 and September 30, 2017, respectively		0
Maximum | Pending Litigation
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss		3,100
Maximum | Customer Contracts
Loss Contingencies [Line Items]
Accounts receivable, net of allowance for doubtful accounts of $591 and $1,062 at June 30, 2018 and September 30, 2017, respectively		$ 17,300

Subsequent Events Subsequent 61

Subsequent Events Subsequent Events (Details) - Subsequent Event [Member] - USD ($)	Jul. 20, 2018	Jul. 19, 2018	May 20, 2019
Subsequent Event [Line Items]
Sale of stock, consideration received		$ 1,000,000,000
Sale of stock, number of shares issued		10,582,010
Sale of stock, price (in USD per share)		$ 94.50
Accelerated Share Repurchases, Settlement (Payment) or Receipt	$ 1,000,000,000
Accelerated Share Repurchases, Initial Number of Shares	8,244,873
Accelerated Share Repurchases, Initial Price Paid Per Share	$ 97.03
Stock Repurchased and Retired During Period, Value			$ 200,000,000
Minimum [Member]
Subsequent Event [Line Items]
Accelerated Share Repurchase Settlement Period	7 months 15 days
Maximum [Member]
Subsequent Event [Line Items]
Accelerated Share Repurchase Settlement Period	10 months
Initial
Subsequent Event [Line Items]
Stock Repurchased and Retired During Period, Value	$ 800,000,000