Dycom Industries (DY) 10-Q 22 Nov 17 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Oct. 28, 2017	Nov. 19, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	DYCOM INDUSTRIES INC
Entity Central Index Key	67,215
Current Fiscal Year End Date	--01-27
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Oct. 28, 2017
Entity Common Stock, Shares Outstanding		30,938,786

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Oct. 28, 2017	Jul. 29, 2017
Current assets:
Cash and equivalents	$ 24,531	$ 38,608
Accounts receivable, net	347,727	369,800
Costs and estimated earnings in excess of billings	406,517	389,286
Inventories	83,877	83,204
Deferred tax assets, net	0	26,524
Income tax receivable	1,008	7,493
Other current assets	29,710	23,603
Total current assets	893,370	938,518
Property and equipment, net	423,330	422,107
Goodwill	321,783	321,748
Intangible assets, net	177,286	183,561
Other	36,753	33,373
Total non-current assets	959,152	960,789
Total assets	1,852,522	1,899,307
Current liabilities:
Accounts payable	109,877	132,974
Current portion of debt	24,063	21,656
Billings in excess of costs and estimated earnings	6,599	9,284
Accrued insurance claims	48,424	39,909
Income taxes payable	10,067	1,112
Other accrued liabilities	84,091	113,603
Total current liabilities	283,121	318,538
Long-term debt	736,008	738,265
Accrued insurance claims	60,782	62,007
Deferred tax liabilities, net non-current	77,622	103,626
Other liabilities	5,351	5,288
Total liabilities	1,162,884	1,227,724
COMMITMENTS AND CONTINGENCIES, Note 17
Stockholders’ equity:
Preferred stock, par value $1.00 per share: 1,000,000 shares authorized: no shares issued and outstanding	0	0
Common stock, par value $0.33 1/3 per share: 150,000,000 shares authorized: 30,938,031 and 31,087,285 issued and outstanding, respectively	10,313	10,362
Additional paid-in capital	6,383	10,092
Accumulated other comprehensive loss	(1,252)	(1,158)
Retained earnings	674,194	652,287
Total stockholders’ equity	689,638	671,583
Total liabilities and stockholders’ equity	$ 1,852,522	$ 1,899,307

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Oct. 28, 2017	Jul. 29, 2017
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, authorized (in shares)	1,000,000	1,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.333	$ 0.333
Common stock, authorized (in shares)	150,000,000	150,000,000
Common stock, issued (in shares)	30,938,031	31,087,285
Common stock, shares outstanding	30,938,031	31,087,285

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Oct. 28, 2017	Oct. 29, 2016
REVENUES:
Contract revenues	$ 756,215	$ 799,223
EXPENSES:
Costs of earned revenues, excluding depreciation and amortization	600,847	614,990
General and administrative (including stock-based compensation expense of $7.4 million and $5.7 million, respectively)	64,562	60,204
Depreciation and amortization	42,651	34,546
Total	708,060	709,740
Interest expense, net	(9,707)	(9,067)
Other income, net	5,931	940
Income before income taxes	44,379	81,356
Provision (benefit) for income taxes:
Current	15,085	28,694
Deferred	518	1,612
Total provision for income taxes	15,603	30,306
Net income	$ 28,776	$ 51,050
Earnings per common share:
Basic earnings per common share (in dollars per share)	$ 0.93	$ 1.62
Diluted earnings per common share (in dollars per share)	$ 0.90	$ 1.59
Shares used in computing earnings per common share:
Basic (in shares)	31,061,448	31,429,493
Diluted (in shares)	31,891,574	32,200,287

CONSOLIDATED STATEMENTS OF OPE5

CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Oct. 28, 2017	Oct. 29, 2016
Income Statement [Abstract]
Stock-based compensation	$ 7,380	$ 5,707

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Oct. 28, 2017	Oct. 29, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 28,776	$ 51,050
Foreign currency translation losses, net of tax	(94)	(26)
Comprehensive income	$ 28,682	$ 51,024

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Oct. 28, 2017	Oct. 29, 2016
OPERATING ACTIVITIES:
Net income	$ 28,776	$ 51,050
Adjustments to reconcile net income to net cash provided by operating activities, net of acquisitions:
Depreciation and amortization	42,651	34,546
Deferred income tax provision	518	1,612
Stock-based compensation	7,380	5,707
Bad debt expense, net	205	82
Gain on sale of fixed assets	(6,495)	(1,443)
Amortization of debt discount	4,547	4,307
Amortization of debt issuance costs and other	859	815
Excess tax benefit from share-based awards	0	(879)
Change in operating assets and liabilities:
Accounts receivable, net	21,868	(2,404)
Costs and estimated earnings in excess of billings, net	(19,944)	(115,498)
Other current assets and inventory	(7,730)	(13,635)
Other assets	1,010	132
Income taxes receivable/payable	15,439	13,881
Accounts payable	(5,339)	1,083
Accrued liabilities, insurance claims, and other liabilities	(26,918)	(20,915)
Net cash provided by operating activities	56,827	(41,559)
INVESTING ACTIVITIES:
Capital expenditures	(56,023)	(40,080)
Proceeds from sale of assets	8,838	2,323
Changes in restricted cash and other	(900)	(463)
Net cash used in investing activities	(48,085)	(38,220)
FINANCING ACTIVITIES:
Proceeds from borrowings on senior credit agreement, including term loans	0	206,000
Principal payments on senior credit agreement, including term loans	(4,813)	(138,000)
Repurchases of common stock	(16,875)	0
Exercise of stock options	204	202
Restricted stock tax withholdings	(1,335)	(1,378)
Excess tax benefit from share-based awards	0	879
Net decrease in cash and equivalents	(22,819)	67,703
Net decrease in cash and equivalents	(14,077)	(12,076)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	38,608	33,787
CASH AND EQUIVALENTS AT END OF PERIOD	24,531	21,711
SUPPLEMENTAL DISCLOSURE OF OTHER CASH FLOW ACTIVITIES AND NON-CASH INVESTING AND FINANCING ACTIVITIES:
Cash paid for interest	5,248	4,924
Cash paid for taxes, net	554	15,381
Purchases of capital assets included in accounts payable or other accrued liabilities at period end	$ 4,077	$ 6,870

Basis of Presentation and Accou

Basis of Presentation and Accounting Policies	3 Months Ended
	Oct. 28, 2017
Accounting Policies [Abstract]
Basis of Presentation and Accounting Policies	Basis of Presentation and Accounting Policies Basis of Presentation Dycom Industries, Inc. (“Dycom” or the “Company”) is a leading provider of specialty contracting services throughout the United States and in Canada. The Company provides program management, engineering, construction, maintenance and installation services for telecommunications providers, underground facility locating services for various utilities, including telecommunications providers, and other construction and maintenance services for electric and gas utilities. The accompanying unaudited condensed consolidated financial statements of the Company and its subsidiaries, all of which are wholly-owned, have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X of the Securities and Exchange Commission (“SEC”). Accordingly, they do not include all of the information and notes required by GAAP for annual financial statements and should be read in conjunction with Management’s Discussion and Analysis of Financial Condition and Results of Operations contained in this report and the Company’s audited financial statements for the fiscal year ended July 29, 2017 included in the Company’s Annual Report on Form 10-K for the fiscal year ended July 29, 2017 , filed with the SEC on September 1, 2017. In the opinion of management, all adjustments considered necessary for a fair statement of the results for the interim periods presented have been included. This includes all normal and recurring adjustments and elimination of intercompany accounts and transactions. Operating results for the interim period are not necessarily indicative of the results expected for any subsequent interim or annual period. Segment Information. The Company operates in one reportable segment. Its services are provided by its operating segments on a decentralized basis. Each operating segment consists of a subsidiary (or in certain instances, the combination of two or more subsidiaries). Management of the operating segments report to the Company’s Chief Operating Officer who reports to the Chief Executive Officer, the chief operating decision maker. All of the Company’s operating segments have been aggregated into one reportable segment based on their similar economic characteristics, nature of services and production processes, type of customers, and service distribution methods. The Company’s operating segments provide services throughout the United States and in Canada. Revenues from services provided in Canada were not material during the three months ended October 28, 2017 and October 29, 2016 . Additionally, the Company had no material long-lived assets in Canada as of October 28, 2017 or July 29, 2017 . Accounting Period. The Company’s fiscal 2017 year ended on the last Saturday in July. In September 2017, the Company’s Board of Directors approved a change in the Company’s fiscal year end from July to January. Beginning with a six-month transition period ending January 27, 2018, the Company’s fiscal year will end on the last Saturday of January. The Company will file a transition report on Form 10-K containing audited financial statements for the six month period from July 30, 2017 to January 27, 2018. After the transition period, each fiscal year will consist of either 52 or 53 weeks of operations (with the additional week of operations occurring in the fourth fiscal quarter). The Company’s 2019 fiscal year will commence on January 28, 2018. Significant Accounting Policies & Estimates There have been no material changes to the Company’s significant accounting policies and critical accounting estimates described in the Company’s Annual Report on Form 10-K for the year ended July 29, 2017 . Use of Estimates. The preparation of financial statements in conformity with GAAP requires management to make certain estimates and assumptions that affect the amounts reported in these condensed consolidated financial statements and accompanying notes. These estimates are based on the Company’s historical experience and management’s understanding of current facts and circumstances. At the time they are made, the Company believes that such estimates are fair when considered in conjunction with the consolidated financial position and results of operations taken as a whole. However, actual results could differ materially from those estimates. Revenue Recognition. The Company performs a substantial majority of its services under master service agreements and other agreements that contain customer-specified service requirements, having discrete pricing for individual tasks. Revenue is recognized under these arrangements based on units-of-delivery as each unit is completed. The remainder of the Company’s services, representing less than 5% of its contract revenues during each of the three months ended October 28, 2017 and October 29, 2016 , are performed under contracts using the cost-to-cost measure of the percentage of completion method of accounting. Revenue is recognized under these arrangements based on the ratio of contract costs incurred to date to total estimated contract costs. For contracts using the cost-to-cost measure of the percentage of completion method of accounting, the Company accrues the entire amount of a contract loss at the time the loss is determined to be probable and can be reasonably estimated. During the three months ended October 28, 2017 and October 29, 2016 , there were no material impacts to the Company’s results of operations due to changes in contract estimates. There were no material amounts of unapproved change orders or claims recognized during the three months ended October 28, 2017 or October 29, 2016 . The current asset “Costs and estimated earnings in excess of billings” represents revenues recognized in excess of amounts billed. The current liability “Billings in excess of costs and estimated earnings” represents billings in excess of revenues recognized. Fair Value of Financial Instruments. The Company’s financial instruments primarily consist of cash and equivalents, restricted cash, accounts receivable, income taxes receivable and payable, accounts payable, certain accrued expenses, and long-term debt. The carrying amounts of these items approximate fair value due to their short maturity, except for the Company’s long-term debt, which is based on observable market-based inputs (Level 2). See Note 11, Debt , for further information regarding the fair value of such financial instruments. The Company’s cash and equivalents are based on quoted market prices in active markets for identical assets (Level 1) as of October 28, 2017 and July 29, 2017 . During the three months ended October 28, 2017 and October 29, 2016 , the Company had no material nonrecurring fair value measurements of assets or liabilities subsequent to their initial recognition. Recently Issued Accounting Pronouncements Recently Adopted Accounting Standards Income Taxes. In November 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2015-17, Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes (“ASU 2015-17”). ASU 2015-17 simplifies the presentation of deferred income taxes by requiring that deferred tax liabilities and assets are solely classified as non-current in a consolidated statement of financial position. The Company adopted ASU 2015-17 on a prospective basis effective July 30, 2017, the first day of the fiscal quarter ended October 28, 2017 . As a result of this adoption, Deferred tax liabilities, net non-current is presented net of approximately $28.2 million of deferred tax assets within the condensed consolidated balance sheets as of October 28, 2017 . Under the previous guidance, these deferred tax assets would have been classified as current. No prior periods have been retrospectively adjusted. Stock Compensation. In March 2016, the FASB issued ASU No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”) with the intention of simplifying accounting for share-based payment transactions. The Company adopted ASU 2016-09 effective July 30, 2017, the first day of the fiscal quarter ended October 28, 2017 . Under the amended guidance, excess tax benefits (“windfalls”) or tax deficiencies (“shortfalls”) are recognized in the Company’s provision for income taxes in the consolidated statements of operations rather than as additional paid-in capital in the consolidated balance sheets. Additionally, windfalls and shortfalls are presented as operating cash flows rather than financing activities. As a result of the amended guidance, the Company recognized approximately $0.9 million of windfalls as a reduction to income tax expense in the condensed consolidated statements of operations during the fiscal quarter ended October 28, 2017 . Additionally, this amount was presented as operating cash flows rather than as financing activities during the fiscal quarter ended October 28, 2017 . Because windfalls are no longer recognized in additional paid-in capital, the amount is excluded from the hypothetical proceeds used to repurchase shares when computing diluted earnings per common share under the treasury stock method. As a result of the amended guidance, diluted shares increased by approximately 169,000 shares during the fiscal quarter ended October 28, 2017 . The inclusion of windfalls and shortfalls as a component of income tax expense or benefit during the period in which they occur will increase the volatility of the Company’s provision for income taxes. The amount of windfalls and shortfalls recognized will be dependent on the volume of share-based award vesting or exercise activity as well as the Company’s stock price at the dates on which stock-based awards vest or are exercised. In accordance with ASU 2016-09, these changes have been applied prospectively and prior periods have not been adjusted. The other components of ASU 2016-09 did not have a material effect on the Company’s condensed consolidated financial statements. See Note 2, Computation of Earnings Per Share , Note 12, Income Taxes , and Note 15, Stock-Based Awards for additional disclosure related to the effects of ASU 2016-09. The Company also adopted the following Accounting Standards Updates during the fiscal quarter ended October 28, 2017 , neither of which had a material effect on the Company’s condensed consolidated financial statements: Standard Adoption Date 2015-11 Inventory (Topic 330): Simplifying the Measurement of Inventory July 30, 2017 2017-09 Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting July 30, 2017 Accounting Standards Not Yet Adopted There were no accounting pronouncements issued during the fiscal quarter ended October 28, 2017 that are significant or potentially significant to the Company. In addition, there have been no changes in the expected dates of adoption or estimated effects on the Company’s consolidated financial statements of recently issued accounting pronouncements from those disclosed in the Company’s Annual Report on Form 10-K for the fiscal year ended July 29, 2017 filed with the SEC on September 1, 2017 . Revenue Recognition. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), requiring entities to recognize revenue to depict the transfer of control of promised goods or services to customers in an amount that reflects the consideration the entity expects to be entitled to receive in exchange for those goods or services. In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date (“ASU 2015-14”), which defers the effective date of the new revenue standard. In 2016, the FASB issued several updates to clarify certain topics within the standard. ASU No. 2014-09 and the related updates are referred to herein as “ASU 2014-09”. The Company continues to evaluate the effect of ASU 2014-09 on its systems, business processes, controls, disclosures, and consolidated financial statements. This assessment involves the comparison of representative contracts with customers with requirements of the new standard and historical accounting practices. Based on the results of the contract reviews performed to date, the Company is expecting to recognize the substantial majority of its revenue from master service agreements and other agreements that contain customer-specified service requirements, recognized over time, using the units-of-delivery input method under ASU 2014-09. For the remainder of the Company’s contracts, representing less than 5% of its contract revenues during the fiscal quarter ended October 28, 2017, the Company is expecting to use a cost-to-cost measurement of revenue, recognized over time, based on the ratio of contract costs incurred to date to total estimated contract costs. The Company expects that the amount and timing of revenue recognition under ASU 2014-09 will not materially differ from the Company’s historic accounting practices. ASU 2014-09 must be applied using either a full retrospective approach or a modified (cumulative effect) retrospective approach. The Company anticipates adopting ASU 2014-09 under the modified (cumulative effect) retrospective approach. Under this approach, ASU 2014-09 would apply to all new contracts initiated on or after January 28, 2018. For existing contracts with remaining performance obligations as of January 28, 2018, a cumulative effect adjustment to the opening retained earnings balance would be recognized for those contracts, as the difference between the current revenue recognition practices and the criteria required by ASU 2014-09. ASU 2014-09 is effective for fiscal years beginning after December 15, 2017. The Company will adopt ASU 2014-09 as of January 28, 2018, the first day of fiscal 2019. The Company has not yet quantified the potential impact of adopting ASU 2014-09; however, based on contracts evaluated to date, the adoption is not expected to have a material impact on the timing or amount of revenue recognized under contracts with customers, as compared to current revenue recognition practices. The Company expects the cumulative impact adjustment to opening retained earnings to be immaterial, with an immaterial impact to the Company’s net income on an ongoing basis. Prior periods will not be retrospectively adjusted. This expectation may change as the process to assess the impact is still ongoing. The Company expects to complete the assessment of the impact of ASU 2014-09 during the fiscal quarter ending January 27, 2018.

Computation of Earnings Per Com

Computation of Earnings Per Common Share	3 Months Ended
	Oct. 28, 2017
Earnings Per Share [Abstract]
Computation of Earnings Per Common Share	Computation of Earnings per Common Share The following table sets forth the computation of basic and diluted earnings per common share (dollars in thousands, except per share amounts): For the Three Months Ended October 28, 2017 October 29, 2016 Net income available to common stockholders (numerator) $ 28,776 $ 51,050 Weighted-average number of common shares (denominator) 31,061,448 31,429,493 Basic earnings per common share $ 0.93 $ 1.62 Weighted-average number of common shares 31,061,448 31,429,493 Potential shares of common stock arising from stock options, and unvested restricted share units (1) 830,126 770,794 Total shares-diluted (denominator) 31,891,574 32,200,287 Diluted earnings per common share $ 0.90 $ 1.59 (1) As discussed in Note 1, Basis of Presentation and Accounting Policies , the Company has adopted ASU 2016-09. Under the amended guidance, windfalls or shortfalls are recognized in the Company’s provision for income taxes in the consolidated statements of operations rather than as additional paid-in capital in the consolidated balance sheets. Because windfalls are no longer recognized in additional paid-in capital, the amount is excluded from the hypothetical proceeds used to repurchase shares when computing diluted earnings per common share under the treasury stock method. As a result of the amended guidance, diluted shares increased by approximately 169,000 shares during the fiscal quarter ended October 28, 2017 . ASU 2016-09’s effect on the calculation of diluted earnings per common share may result in significant volatility in earnings based on the timing and extent of share-based award vesting and exercise events. The weighted-average number of common shares outstanding used in the computation of diluted earnings per common share excludes the effect of the following instruments because their inclusion would have been anti-dilutive: For the Three Months Ended October 28, 2017 October 29, 2016 Stock-based awards 125,074 41,302 0.75% convertible senior notes due 2021 5,005,734 5,005,734 Warrants 5,005,734 5,005,734 Total anti-dilutive weighted shares excluded from the calculation of earnings per common share 10,136,542 10,052,770 Under the treasury stock method, the convertible senior notes will have a dilutive impact on earnings per common share if the Company’s average stock price for the period exceeds the conversion price for the convertible senior notes of $96.89 per share. The warrants will have a dilutive impact on earnings per common share if the Company’s average stock price for the period exceeds the warrant strike price of $130.43 per share. As the Company’s average stock price for the three months ended October 28, 2017 was below the conversion price for the convertible senior notes and the strike price for the warrants, the underlying common shares were anti-dilutive as reflected in the table above. In connection with the offering of the convertible senior notes, the Company entered into convertible note hedge transactions with counterparties for the purpose of reducing the potential dilution to common stockholders from the conversion of the notes and offsetting any potential cash payments in excess of the principal amount of the notes. Prior to conversion, the convertible note hedge is not included for purposes of the calculation of earnings per common share as its effect would be anti-dilutive. Upon conversion, the convertible note hedge is expected to offset the dilutive effect of the convertible senior notes when the average stock price for the period is above $96.89 per share. See Note 11, Debt , for additional information related to the Company’s convertible senior notes, warrant transactions, and hedge transactions.

Acquisitions

Acquisitions	3 Months Ended
	Oct. 28, 2017
Business Combinations [Abstract]
Acquisitions	Acquisitions Fiscal 2017. During March 2017, the Company acquired Texstar Enterprises, Inc. (“Texstar”) for $26.1 million , net of cash acquired. Texstar provides construction and maintenance services for telecommunications providers in the Southwest and Pacific Northwest regions of the United States. This acquisition expanded the Company’s geographic presence within its existing customer base. The purchase price allocation of Texstar is preliminary and will be completed when valuations for intangible assets and other amounts are finalized within the 12-month measurement period from the date of acquisition. In accordance with ASU 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments , the Company will recognize any adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustments are determined. Additionally, the Company will record, in the same period’s financial statements in which adjustments are recorded, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of any change to the provisional amounts, calculated as if the accounting adjustment had been completed at the acquisition date. The preliminary purchase price allocation of Texstar is as follows (dollars in millions): Assets Accounts receivable $ 8.8 Costs and estimated earnings in excess of billings 2.4 Inventories and other current assets 0.3 Property and equipment 5.6 Goodwill 10.1 Intangible assets - customer relationships 9.8 Intangible assets - trade names and other 0.7 Total assets 37.7 Liabilities Accounts payable 3.2 Accrued and other current liabilities 3.4 Deferred tax liabilities, net non-current 5.0 Total liabilities 11.6 Net Assets Acquired $ 26.1 The goodwill associated with the stock purchase of Texstar is not deductible for tax purposes. Results of this acquisition are included in the condensed consolidated financial statements from the date of acquisition and were not material during the three months ended October 28, 2017 .

Accounts Receivable

Accounts Receivable	3 Months Ended
	Oct. 28, 2017
Receivables [Abstract]
Accounts Receivable	Accounts Receivable Accounts receivable consisted of the following (dollars in thousands): October 28, 2017 July 29, 2017 Contract billings $ 326,666 $ 348,990 Retainage 22,056 21,645 Total 348,722 370,635 Less: allowance for doubtful accounts (995 ) (835 ) Accounts receivable, net $ 347,727 $ 369,800 The Company grants credit under normal payment terms, generally without collateral, to its customers. The Company expects to collect the outstanding balance of accounts receivable, net (including retainage) within the next twelve months. The Company maintains an allowance for doubtful accounts for estimated losses on uncollected balances. During the three months ended October 28, 2017 and October 29, 2016 , write-offs to the allowance for doubtful accounts, net of recoveries, were not material. There were no material accounts receivable amounts representing claims or other similar items subject to uncertainty as of October 28, 2017 or July 29, 2017 .

Costs and Estimated Earnings in

Costs and Estimated Earnings in Excess of Billings	3 Months Ended
	Oct. 28, 2017
Contractors [Abstract]
Costs and Estimated Earnings in Excess of Billings	Costs and Estimated Earnings in Excess of Billings Costs and estimated earnings in excess of billings (“CIEB”) includes revenue for services performed under contracts using the units-of-delivery method of accounting and the cost-to-cost measure of the percentage of completion method of accounting. Amounts consisted of the following (dollars in thousands): October 28, 2017 July 29, 2017 Costs incurred on contracts in progress $ 351,361 $ 327,312 Estimated to date earnings 92,523 92,781 Total costs and estimated earnings 443,884 420,093 Less: billings to date (43,966 ) (40,091 ) $ 399,918 $ 380,002 Included in the accompanying condensed consolidated balance sheets under the captions: Costs and estimated earnings in excess of billings $ 406,517 $ 389,286 Billings in excess of costs and estimated earnings (6,599 ) (9,284 ) $ 399,918 $ 380,002 As of October 28, 2017 , the Company expects that substantially all of its CIEB will be billed to customers and collected in the normal course of business within the next twelve months. There were no material CIEB amounts representing claims or other similar items subject to uncertainty as of October 28, 2017 or July 29, 2017 .

Other Current Assets and Other

Other Current Assets and Other Assets	3 Months Ended
	Oct. 28, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Current Assets and Other Assets	Other Current Assets and Other Assets Other current assets consisted of the following (dollars in thousands): October 28, 2017 July 29, 2017 Prepaid expenses $ 17,488 $ 10,588 Receivables on equipment sales 908 2,761 Deposits and other current assets 11,314 10,254 Total other current assets $ 29,710 $ 23,603 Other assets (long-term) consisted of the following (dollars in thousands): October 28, 2017 July 29, 2017 Deferred financing costs $ 4,319 $ 4,797 Restricted cash 5,408 5,408 Insurance recoveries for accrued insurance claims 14,135 9,243 Other non-current deposits and assets 12,891 13,925 Total other assets $ 36,753 $ 33,373

Property and Equipment

Property and Equipment	3 Months Ended
	Oct. 28, 2017
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and Equipment Property and equipment consisted of the following (dollars in thousands): Estimated Useful Lives (Years) October 28, 2017 July 29, 2017 Land — $ 3,470 $ 3,470 Buildings 10-35 12,255 12,073 Leasehold improvements 1-10 13,985 13,912 Vehicles 1-5 505,327 496,820 Computer hardware and software 1-7 111,388 107,779 Office furniture and equipment 1-10 13,190 12,226 Equipment and machinery 1-10 291,454 288,993 Total 951,069 935,273 Less: accumulated depreciation (527,739 ) (513,166 ) Property and equipment, net $ 423,330 $ 422,107 Depreciation expense was $36.4 million and $28.4 million for the three months ended October 28, 2017 and October 29, 2016 , respectively.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	3 Months Ended
	Oct. 28, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill The Company’s goodwill balance was $321.8 million and $321.7 million as of October 28, 2017 and July 29, 2017 , respectively. Changes in the carrying amount of goodwill during the three months ended October 28, 2017 were as follows (dollars in thousands): Goodwill Accumulated Impairment Losses Total Balance as of July 29, 2017 $ 517,515 $ (195,767 ) $ 321,748 Purchase price allocation adjustments 35 — 35 Balance as of October 28, 2017 $ 517,550 $ (195,767 ) $ 321,783 The Company’s goodwill resides in multiple reporting units and primarily consists of expected synergies resulting from acquisitions, including the expansion of the Company’s geographic presence and strengthening of its customer base. Goodwill and other indefinite-lived intangible assets are assessed annually for impairment, or more frequently if events occur that would indicate a potential reduction in the fair value of a reporting unit below its carrying value. The profitability of individual reporting units may suffer periodically due to downturns in customer demand and the level of overall economic activity including, in particular, construction and housing activity. The Company’s customers may reduce capital expenditures and defer or cancel pending projects during times of slowing economic conditions. Additionally, adverse conditions in the economy and future volatility in the equity and credit markets could impact the valuation of the Company’s reporting units. The cyclical nature of the Company’s business, the high level of competition existing within its industry, and the concentration of its revenues from a limited number of customers may also cause results to vary. These factors may affect individual reporting units disproportionately, relative to the Company as a whole. As a result, the performance of one or more of the reporting units could decline, resulting in an impairment of goodwill or intangible assets. The Company has historically completed its annual goodwill impairment assessment as of the first day of the fourth fiscal quarter of each year. As a result of the Company’s fiscal 2017 annual assessment, the Company determined that the fair values of each of the reporting units and the indefinite-lived intangible asset were substantially in excess of their carrying values and no impairment had occurred. As of October 28, 2017 , the Company continues to believe the goodwill and the indefinite-lived intangible asset are recoverable for all of its reporting units; however, significant adverse changes in the projected revenues and cash flows of a reporting unit could result in an impairment of goodwill or the indefinite-lived intangible asset . There can be no assurances that goodwill or the indefinite-lived intangible asset may not be impaired in future periods. Intangible Assets The Company’s intangible assets consisted of the following (dollars in thousands): October 28, 2017 July 29, 2017 Weighted Average Remaining Useful Lives (Years) Gross Carrying Amount Accumulated Amortization Intangible Assets, Net Gross Carrying Amount Accumulated Amortization Intangible Assets, Net Customer relationships 11.8 $ 299,717 $ 129,966 $ 169,751 $ 299,717 $ 124,084 $ 175,633 Trade names 8.2 10,350 7,656 2,694 10,350 7,285 3,065 UtiliQuest trade name — 4,700 — 4,700 4,700 — 4,700 Non-compete agreements 2.3 450 309 141 450 287 163 $ 315,217 $ 137,931 $ 177,286 $ 315,217 $ 131,656 $ 183,561 Amortization of the Company’s customer relationship intangibles is recognized on an accelerated basis as a function of the expected economic benefit. Amortization for the Company’s other finite-lived intangibles is recognized on a straight-line basis over the estimated useful life. Amortization expense for finite-lived intangible assets was $6.3 million and $6.2 million for the three months ended October 28, 2017 and October 29, 2016 , respectively. As of October 28, 2017 , the Company believes that the carrying amounts of its intangible assets are recoverable. However, if adverse events were to occur or circumstances were to change indicating that the carrying amount of such assets may not be fully recoverable, the assets would be reviewed for impairment and the assets could be impaired.

Accrued Insurance Claims

Accrued Insurance Claims	3 Months Ended
	Oct. 28, 2017
Accrued Insurance Claims [Abstract]
Accrued Insurance Claims	Accrued Insurance Claims For claims within its insurance program, the Company retains the risk of loss, up to certain limits, for matters related to automobile liability, general liability (including damages associated with underground facility locating services), workers’ compensation, and employee group health. With regard to losses occurring in the twelve month policy period ending July 31, 2018, the Company retains the risk of loss up to $1.0 million on a per occurrence basis for automobile liability, general liability, and workers’ compensation. These retention amounts are applicable to all of the states in which the Company operates, except with respect to workers’ compensation insurance in two states in which the Company participates in state-sponsored insurance funds. Aggregate stop-loss coverage for automobile liability, general liability, and workers’ compensation claims is $67.1 million for the twelve month policy period ending July 31, 2018. The Company is party to a stop-loss agreement for losses under its employee group health plan. For calendar year 2017, the Company retains the risk of loss, on an annual basis, up to the first $400,000 of claims per participant as well as an annual aggregate amount. The liability for total accrued insurance claims and related processing costs was $109.2 million and $101.9 million as of October 28, 2017 and July 29, 2017 , respectively, of which $60.8 million and $62.0 million , respectively, was long-term and reflected in non-current liabilities in the condensed consolidated balance sheets. Insurance recoveries/receivables related to accrued claims as of October 28, 2017 and July 29, 2017 were $14.1 million and $9.2 million , respectively, which were included in non-current other assets in the condensed consolidated balance sheets.

Other Accrued Liabilities

Other Accrued Liabilities	3 Months Ended
	Oct. 28, 2017
Payables and Accruals [Abstract]
Other Accrued Liabilities	Other Accrued Liabilities Other accrued liabilities consisted of the following (dollars in thousands): October 28, 2017 July 29, 2017 Accrued payroll and related taxes $ 26,006 $ 24,554 Accrued employee benefit and incentive plan costs 12,430 42,135 Accrued construction costs 29,316 29,942 Other current liabilities 16,339 16,972 Total other accrued liabilities $ 84,091 $ 113,603

Debt

Debt	3 Months Ended
	Oct. 28, 2017
Debt Disclosure [Abstract]
Debt	Debt The Company’s outstanding indebtedness consisted of the following (dollars in thousands): October 28, 2017 July 29, 2017 Credit Agreement - Revolving facility (matures April 2020) $ — $ — Credit Agreement - Term loan facilities (mature April 2020) 362,875 367,688 0.75% convertible senior notes, net (mature September 2021) 397,196 392,233 760,071 759,921 Less: current portion (24,063 ) (21,656 ) Long-term debt $ 736,008 $ 738,265 Senior Credit Agreement The Company and certain of its subsidiaries are party to a credit agreement with various lenders, dated as of December 3, 2012 (as amended as of June 17, 2016, May 20, 2016, April 24, 2015 and September 9, 2015), that matures on April 24, 2020 (as amended, the “Credit Agreement”). The Credit Agreement provides for a $450.0 million revolving facility, $385.0 million in aggregate term loan facilities, and contains a sublimit of $200.0 million for the issuance of letters of credit. Subject to certain conditions the Credit Agreement provides the Company with the ability to enter into one or more incremental facilities, either by increasing the revolving commitments under the Credit Agreement and/or in the form of term loans up to the greater of (i) $150.0 million and (ii) an amount such that, after giving effect to such incremental facilities on a pro forma basis (assuming that the amount of the incremental commitments are fully drawn and funded), the consolidated senior secured leverage ratio does not exceed 2.25 to 1.00. The consolidated senior secured leverage ratio is the ratio of the Company’s consolidated senior secured indebtedness to its trailing twelve month consolidated earnings before interest, taxes, depreciation, and amortization (“EBITDA”), as defined by the Credit Agreement. Borrowings under the Credit Agreement are guaranteed by substantially all of the Company’s subsidiaries and secured by the equity interests of the substantial majority of the Company’s subsidiaries. Borrowings under the Credit Agreement bear interest at rates described below based upon the Company’s consolidated leverage ratio, which is the ratio of the Company’s consolidated total funded debt to its trailing twelve month consolidated EBITDA, as defined by the Credit Agreement. In addition, the Company incurs certain fees for unused balances and letters of credit at the rates described below, also based upon the Company’s consolidated leverage ratio: Borrowings - Eurodollar Rate Loans 1.25% - 2.00% plus LIBOR Borrowings - Base Rate Loans 0.25% - 1.00% plus administrative agent’s base rate (1) Unused Revolver Commitment 0.25% - 0.40% Standby Letters of Credit 1.25% - 2.00% Commercial Letters of Credit 0.625% - 1.00% (1) The agent’s base rate is described in the Credit Agreement as the highest of (i) the administrative agent’s prime rate, (ii) the Federal Funds Rate plus 0.50% , and (iii) the Eurodollar rate plus 1.00% , plus an applicable margin. Standby letters of credit of approximately $48.7 million , issued as part of the Company’s insurance program, were outstanding under the Credit Agreement as of both October 28, 2017 and July 29, 2017 . The weighted average interest rates and fees for balances under the Credit Agreement as of October 28, 2017 and July 29, 2017 were as follows: Weighted Average Rate End of Period October 28, 2017 July 29, 2017 Borrowings - Term loan facilities 2.99% 2.98% Borrowings - Revolving facility (1) —% —% Standby Letters of Credit 1.75% 1.75% Unused Revolver Commitment 0.35% 0.35% (1) There were no outstanding borrowings under the revolving facility as of October 28, 2017 or July 29, 2017 . The Credit Agreement contains a financial covenant that requires the Company to maintain a consolidated leverage ratio of not greater than 3.50 to 1.00 , as measured at the end of each fiscal quarter. It provides for certain increases to this ratio as specified in the Credit Agreement in connection with permitted acquisitions. In addition, the Credit Agreement contains a financial covenant that requires the Company to maintain a consolidated interest coverage ratio, which is the ratio of the Company’s trailing twelve month consolidated EBITDA to its consolidated interest expense, as defined by the Credit Agreement, of not less than 3.00 to 1.00 , as measured at the end of each fiscal quarter. At both October 28, 2017 and July 29, 2017 , the Company was in compliance with the financial covenants of the Credit Agreement and had borrowing availability in the revolving facility of $401.3 million as determined by the most restrictive covenant. 0.75% Convertible Senior Notes Due 2021 On September 15, 2015, the Company issued 0.75% convertible senior notes due September 2021 (the “Notes”) in a private placement in the principal amount of $485.0 million . The Notes, governed by the terms of an indenture between the Company and a bank trustee are unsecured obligations and do not contain any financial covenants or restrictions on the payments of dividends, the incurrence of indebtedness or the issuance or repurchase of securities by the Company. The Notes bear interest at a rate of 0.75% per year, payable in cash semiannually in March and September, and will mature on September 15, 2021, unless earlier purchased by the Company or converted. In the event the Company fails to perform certain obligations under the indenture, the Notes will accrue additional interest. Certain events are considered “events of default” under the Notes, which may result in the acceleration of the maturity of the Notes, as described in the indenture. Each $1,000 of principal of the Notes is convertible into 10.3211 shares of the Company’s common stock, which is equivalent to an initial conversion price of approximately $96.89 per share. The conversion rate is subject to adjustment in certain circumstances, including in connection with specified fundamental changes (as defined in the indenture). In addition, holders of the Notes have the right to require the Company to repurchase all or a portion of their notes on the occurrence of a fundamental change at a price of 100% of their principal amount plus accrued and unpaid interest. Prior to June 15, 2021, the Notes are convertible by the Note holder under the following circumstances: (1) during any fiscal quarter commencing after October 24, 2015 (and only during such fiscal quarter) if the last reported sale price of the Company’s common stock for at least 20 trading days (whether or not consecutive) during the 30 consecutive trading days period ending on the last trading day of the immediately preceding fiscal quarter is greater than or equal to 130% of the applicable conversion price on such trading day; (2) during the five consecutive business day period after any five consecutive trading day period (the “measurement period”) in which the trading price per $1,000 principal amount of Notes for each trading day of such measurement period was less than 98% of the product of the last reported sale price of the Company’s common stock and the applicable conversion rate on each such trading day; or (3) upon the occurrence of specified corporate events. On or after June 15, 2021 until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or a portion of their Notes at any time regardless of the foregoing circumstances. Upon conversion, the Notes will be settled, at the Company’s election, in cash, shares of the Company’s common stock, or a combination of cash and shares of the Company’s common stock. The Company intends to settle the principal amount of the Notes with cash. In accordance with ASC Topic 470, Debt , certain convertible debt instruments that may be settled in cash upon conversion are required to be accounted for as separate liability and equity components. The carrying amount of the liability component is calculated by measuring the fair value of a similar instrument that does not have an associated convertible feature using an indicative market interest rate (“Comparable Yield”) as of the date of issuance. The difference between the principal amount of the notes and the carrying amount represents a debt discount. The debt discount is amortized to interest expense using the Comparable Yield ( 5.5% with respect to the Notes) using the effective interest rate method over the term of the notes. The Company incurred $4.5 million and $4.3 million of interest expense during the three months ended October 28, 2017 and October 29, 2016 , respectively, for the non-cash amortization of the debt discount. The liability component of the Notes consisted of the following (dollars in thousands): October 28, 2017 July 29, 2017 Liability component Principal amount of 0.75% convertible senior notes due September 2021 $ 485,000 $ 485,000 Less: Debt discount (79,522 ) (84,069 ) Less: Debt issuance costs (8,282 ) (8,698 ) Net carrying amount of Notes $ 397,196 $ 392,233 The equity component of the Notes was recognized at issuance and represents the difference between the principal amount of the Notes and the debt discount. The equity component approximated $112.6 million at the time of issuance and its fair value is not remeasured as long as it continues to meet the conditions for equity classification. The Company determined that the fair value of the Notes as of October 28, 2017 and July 29, 2017 was approximately $481.8 million and $474.5 million , respectively, based on quoted market prices (Level 2), compared to a net carrying amount of $397.2 million and $392.2 million , respectively. The fair value and net carrying amounts as of October 28, 2017 and July 29, 2017 are both reflected net of the debt discount of $79.5 million and $84.1 million , respectively, and debt issuance costs of $8.3 million and $8.7 million , respectively. Convertible Note Hedge and Warrant Transactions In connection with the offering of the Notes, the Company entered into convertible note hedge transactions with counterparties to reduce the potential dilution to common stockholders from the conversion of the Notes and offsetting any potential cash payments in excess of the principal amount of the Notes. In the event that shares or cash are deliverable to holders of the Notes upon conversion at limits defined in the indenture, counterparties to the convertible note hedge will be required to deliver up to 5.006 million shares of the Company’s common stock or pay cash to the Company in a similar amount as the value that the Company delivers to the holders of the Notes based on a conversion price of $96.89 per share. In addition, the Company entered into separately negotiated warrant transactions with the same counterparties as the convertible note hedge transactions whereby the Company sold warrants to purchase, subject to certain anti-dilution adjustments, up to 5.006 million shares of the Company’s common stock at a price of $130.43 per share. The warrants will not have a dilutive effect on the Company’s earnings per share unless the Company’s quarterly average share price exceeds the warrant strike price of $130.43 per share. In this event, the Company expects to settle the warrant transactions on a net share basis whereby it will issue shares of its common stock. Upon settlement of the conversion premium of the Notes, convertible note hedge, and warrants, the resulting dilutive impact of these transactions, if any, would be the number of shares necessary to settle the value of the warrant transactions above $130.43 per share. The net amounts incurred in connection with the convertible note hedge and warrant transactions were recorded as a reduction to additional paid-in capital on the condensed consolidated balance sheets during fiscal 2016 and are not expected to be remeasured in subsequent reporting periods. The Company recorded an initial deferred tax liability of $43.4 million in connection with the debt discount associated with the Notes and recorded an initial deferred tax asset of $43.2 million in connection with the convertible note hedge transactions. Both the deferred tax liability and deferred tax asset are included in non-current deferred tax liabilities in the consolidated balance sheets.

Income Taxes

Income Taxes	3 Months Ended
	Oct. 28, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company accounts for income taxes under the asset and liability method. This approach requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the carrying amounts and the tax bases of assets and liabilities. As discussed in Note 1, Basis of Presentation and Accounting Policies , the Company has adopted ASU 2015-17 on a prospective basis effective July 30, 2017. Under the amended guidance of ASU 2015-17, deferred tax liabilities and assets are solely classified as non-current in a consolidated statement of financial position. Under the prior guidance, approximately $28.2 million of deferred tax assets, net would have been classified as current within the condensed consolidated balance sheets as of October 28, 2017 . The Company’s effective income tax rate differs from the statutory rate for the tax jurisdictions where it operates primarily as the result of the impact of non-deductible and non-taxable items, tax credits recognized in relation to pre-tax results, and the recognition of certain tax benefits from share-based award activities upon the adoption of ASU 2016-09, which reduced income tax expense by approximately $0.9 million for the three months ended October 28, 2017 . Measurement of the Company’s tax position is based on applicable statutes, federal and state case law, and its interpretations of tax regulations. The Company is subject to federal income taxes in the United States and the income taxes of multiple state jurisdictions and in Canada. Amounts of pre-tax earnings related to Canadian operations for the three months ended October 28, 2017 and October 29, 2016 were not material. With few exceptions, the Company is no longer subject to U.S. federal, state and local, or Canadian income tax examinations for fiscal years ended 2013 and prior. The Company believes its provision for income taxes is adequate; however, any assessment would affect the Company’s results of operations and cash flows. During fiscal 2016, the Company was notified by the Internal Revenue Service (“IRS”) that its federal income tax return for fiscal 2014 was selected for examination. The IRS completed its examination during 2017 with no proposed adjustments to the Company’s tax return. As of October 28, 2017 and July 29, 2017 , the Company had total unrecognized tax benefits of $3.1 million resulting from uncertain tax positions. The Company’s effective tax rate will be reduced during future periods if it is determined these unrecognized tax benefits are realizable. The Company had approximately $1.2 million accrued for the payment of interest and penalties as of both October 28, 2017 and July 29, 2017 . Interest expense related to unrecognized tax benefits for the Company for the three months ended October 28, 2017 and October 29, 2016 was not material.

Other Income, Net

Other Income, Net	3 Months Ended
	Oct. 28, 2017
Other Income and Expenses [Abstract]
Other Income, Net	Other Income, Net The components of other income, net, were as follows (dollars in thousands): For the Three Months Ended October 28, 2017 October 29, 2016 Gain on sale of fixed assets $ 6,495 $ 1,443 Miscellaneous expense, net (564 ) (503 ) Total other income, net $ 5,931 $ 940 The Company participates in a customer-sponsored vendor payment program. All eligible accounts receivable from this customer are included in the program and payment is received pursuant to a non-recourse sale to the customer’s bank partner. This program effectively reduces the time to collect these receivables as compared to that customer’s standard payment terms. The Company incurs a discount fee to the bank on the payments received that is reflected as an expense component in other income, net, in the condensed consolidated statements of operations. During the three months ended October 28, 2017 and October 29, 2016 , miscellaneous expense, net includes approximately $0.7 million and $0.6 million , respectively, of discount fee expense incurred in connection with the non-recourse sale of accounts receivable under this program. The program has not changed since its inception during fiscal 2016.

Capital Stock

Capital Stock	3 Months Ended
	Oct. 28, 2017
Stockholders' Equity Note [Abstract]
Capital Stock	Capital Stock Repurchases of Common Stock. The Company made the following share repurchases during fiscal 2017 and the three months ended October 28, 2017 : Period Number of Shares Repurchased Total Consideration (In thousands) Average Price Per Share Fiscal 2017 713,006 $ 62,909 $ 88.23 Three months ended October 28, 2017 200,000 $ 16,875 $ 84.38 As of October 28, 2017 , $95.2 million remained available for repurchases through August 2018 under the Company’s share repurchase program. All shares repurchased have been canceled. Upon cancellation, the excess paid over par value is recorded as a reduction of additional paid-in capital. Once additional paid-in capital is exhausted, any additional excess is recorded as a reduction of retained earnings. Accordingly, retained earnings was reduced by $42.8 million and $6.9 million during fiscal 2017 and the three months ended October 28, 2017 , respectively, related to the Company’s share repurchases. Restricted Stock Tax Withholdings. During the three months ended October 28, 2017 and October 29, 2016 , the Company withheld 15,918 shares and 16,290 shares, respectively, totaling $1.3 million and $1.4 million , respectively, to meet payroll tax withholdings obligations arising from the vesting of restricted share units. All shares withheld have been canceled. Shares of common stock withheld for tax withholdings do not reduce the Company’s total share repurchase authority.

Stock-Based Awards

Stock-Based Awards	3 Months Ended
	Oct. 28, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Awards	Stock-Based Awards The Company has certain stock-based compensation plans under which it grants stock-based awards, including common stock, stock options, restricted share units, and performance-based restricted share units (“Performance RSUs”) to attract, retain, and reward talented employees, officers and directors, and to align stockholder and employee interests. Compensation expense for stock-based awards is based on fair value at the measurement date. It fluctuates over time as a function of the duration of vesting periods of the stock-based awards and the Company’s performance, as measured by criteria set forth in performance-based awards. This expense is included in general and administrative expenses in the condensed consolidated statements of operations and the amount of expense ultimately recognized depends on the quantity of awards that actually vest. Accordingly, stock-based compensation expense may vary from period to period. The performance criteria for the Company’s performance-based equity awards utilize the Company’s fiscal year operating earnings (adjusted for certain amounts) as a percentage of contract revenues and its fiscal year operating cash flow level (adjusted for certain amounts). Additionally, certain awards include three-year performance goals that, if met, result in supplemental shares awarded. For Performance RSUs, the Company evaluates compensation expense quarterly and recognizes expense for performance-based awards only if it determines it is probable that performance criteria for the awards will be met. Stock-based compensation expense and the related tax benefit recognized related to stock options and restricted share units during the three months ended October 28, 2017 and October 29, 2016 were as follows (dollars in thousands): For the Three Months Ended October 28, 2017 October 29, 2016 Stock-based compensation $ 7,380 $ 5,707 Related tax benefit for stock-based compensation $ 2,882 $ 2,183 In addition, as a result of the Company’s adoption of ASU 2016-09, the Company recognized approximately $0.9 million of certain tax benefits from share-based award activities during the three months ended October 28, 2017 . As of October 28, 2017 , the Company had unrecognized compensation expense related to stock options, time-based restricted share units (“RSUs”), and target Performance RSUs (based on the Company’s estimate of performance goal achievement) of $3.2 million , $9.5 million , and $22.1 million , respectively. This expense will be recognized over a weighted-average number of years of 2.5 , 2.7 , and 2.1 , respectively, based on the average remaining service periods for the awards. As of October 28, 2017 , the Company may recognize an additional $8.7 million in compensation expense in future periods if the maximum amount of Performance RSUs is earned based on certain performance measures being met. Stock Options The following table summarizes stock option award activity during the three months ended October 28, 2017 : Stock Options Shares Weighted Average Exercise Price Outstanding as of July 29, 2017 670,350 $ 25.24 Granted 18,933 $ 85.15 Options exercised (21,325 ) $ 9.57 Canceled — $ — Outstanding as of October 28, 2017 667,958 $ 27.44 Exercisable options as of October 28, 2017 518,053 $ 18.70 RSUs and Performance RSUs The following table summarizes RSU and Performance RSU award activity during the three months ended October 28, 2017 : Restricted Stock RSUs Performance RSUs Share Units Weighted Average Grant Price Share Units Weighted Average Grant Price Outstanding as of July 29, 2017 187,465 $ 60.71 553,882 $ 67.46 Granted 25,227 $ 85.31 138,261 $ 84.13 Share units vested (9,218 ) $ 62.66 (36,121 ) $ 56.08 Forfeited or canceled — $ — (24,753 ) $ 57.32 Outstanding as of October 28, 2017 203,474 $ 63.67 631,269 $ 72.16 The total amount of granted Performance RSUs presented above consists of 99,627 target shares and 38,634 supplemental shares. During the three months ended October 28, 2017 , the Company canceled 21,139 supplemental shares of Performance RSUs, as a result of the fiscal 2017 performance criteria for attaining those supplemental shares being partially met. The total amount of Performance RSUs outstanding as of October 28, 2017 consists of 487,635 target shares and 143,634 supplemental shares.

Concentration of Credit Risk

Concentration of Credit Risk	3 Months Ended
	Oct. 28, 2017
Risks and Uncertainties [Abstract]
Concentration of Credit Risk	Concentration of Credit Risk The Company’s customer base is highly concentrated, with its top five customers accounting for approximately 74.9% of its total contract revenues during each of the three months ended October 28, 2017 and October 29, 2016 . Customers whose contract revenues exceeded 10% of total contract revenues during the three months ended October 28, 2017 or October 29, 2016 were as follows: For the Three Months Ended October 28, 2017 October 29, 2016 Comcast Corporation 21.8% 15.1% AT&T Inc. 19.0% 29.0% CenturyLink, Inc. 18.9% 15.7% Verizon Communications Inc. (1) 10.7% 9.4% Customers whose combined amounts of trade accounts receivable and costs and estimated earnings in excess of billings, net (“CIEB, net”) exceeded 10% of total combined trade receivables and CIEB, net as of October 28, 2017 or July 29, 2017 were as follows (dollars in millions): October 28, 2017 July 29, 2017 Amount % of Total Amount % of Total Comcast Corporation $ 170.8 22.9% $ 159.7 21.3% CenturyLink, Inc. $ 130.1 17.4% $ 136.1 18.1% Verizon Communications Inc. (1) $ 84.3 11.3% $ 73.7 9.8% AT&T Inc. $ 83.7 11.2% $ 87.1 11.6% Windstream Corporation $ 72.0 9.6% $ 84.7 11.3% (1) For comparison purposes in the tables above, amounts from Verizon Communications Inc. and XO Communications LLC’s fiber-optic network business have been combined for periods prior to their February 2017 merger. The Company believes that none of its significant customers were experiencing financial difficulties that would materially impact the collectability of the Company’s trade accounts receivable and costs in excess of billings as of October 28, 2017 . See Note 4, Accounts Receivable , and Note 5, Costs and Estimated Earnings in Excess of Billings , for additional information regarding the Company’s trade accounts receivable and costs and estimated earnings in excess of billings.

Commitment and Contingencies

Commitment and Contingencies	3 Months Ended
	Oct. 28, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies In May 2013, CertusView Technologies, LLC (“CertusView”), a wholly-owned subsidiary of the Company, filed suit against S & N Communications, Inc. and S&N Locating Services, LLC (together, “S&N”) in the United States District Court for the Eastern District of Virginia alleging infringement of certain United States patents. In January 2015, the District Court granted S&N’s motion for judgment on the pleadings for failure to claim patent-eligible subject matter, and entered final judgment. CertusView appealed to the Federal Circuit Court the District Court judgment of patent invalidity. On August 11, 2017, the Federal Circuit Court affirmed the District Court’s decision. In October 2017, S&N filed a motion requesting that the District Court make a finding that the suit was an exceptional case and award S&N recovery of $3.8 million in attorney fees. CertusView has filed an opposition to this motion vigorously opposing an exceptional case finding or award of attorney fees. No decision has been made by the District Court to date on this motion. In September 2016, certain former employees of two subcontractors of TESINC, LLC (“TESINC”), a wholly owned subsidiary of the Company, commenced a lawsuit against those subcontractors, TESINC and a customer of TESINC in the United States District Court for the Eastern District of Pennsylvania. The lawsuit alleges violation of the Fair Labor Standards Act, the Pennsylvania Minimum Wage Act of 1968, the Pennsylvania Wage Payment and Collection Law, and the New Jersey Wage and Hour Law by failing to comply with applicable minimum wage and overtime pay requirements as a result of the misclassification of workers as independent contractors. The plaintiffs sought unspecified damages and other relief on behalf of themselves and a putative class of similarly situated workers who had performed work between April 1, 2016 and June 30, 2016. The parties agreed to settle the lawsuit in March 2017 for an immaterial amount. In November 2017, the District Court approved the settlement. During the fourth quarter of fiscal 2016, one of the Company’s subsidiaries ceased operations. This subsidiary contributed to a multiemployer pension plan, the Pension, Hospitalization and Benefit Plan of the Electrical Industry - Pension Trust Fund (the “Plan”). In October 2016, the Plan demanded payment for a claimed withdrawal liability of approximately $13.0 million . In December 2016, the Company submitted a formal request to the Plan seeking review of the Plan’s withdrawal liability determination. The Company is disputing the claim of a withdrawal liability demanded by the Plan as it believes there is a statutory exemption available under the Employee Retirement Income Security Act for multiemployer pension plans that primarily cover employees in the building and construction industry. The Plan has taken the position that the work at issue does not qualify for the statutory exemption. The Company has submitted this dispute to arbitration, as required by ERISA, with a hearing expected sometime in 2018. There can be no assurance that the Company will be successful in asserting the statutory exemption as a defense in the arbitration proceeding. As required by ERISA, in November 2016, the subsidiary began making monthly payments of a withdrawal liability to the Plan in the amount of approximately $0.1 million . If the Company prevails in disputing the withdrawal liability all such payments will be refunded to the Company. During July 2016, the Company acquired certain assets and assumed certain liabilities associated with the wireless network deployment and wireline operations of Goodman Networks Incorporated (“Goodman”) for a net cash purchase price of $100.9 million after an adjustment of approximately $6.6 million for working capital received below a target amount. $22.5 million of the purchase price was placed into escrow to cover indemnification claims and working capital adjustments. During fiscal 2017, $2.5 million of escrowed funds were released following resolution of closing working capital and $10.0 million of escrowed funds were released as a result of Goodman’s resolution of a sales tax liability with the State of Texas. As of October 28, 2017 , $10.0 million remains in escrow pending resolution of certain post-closing indemnification claims. From time to time, the Company is party to various other claims and legal proceedings. It is the opinion of management, based on information available at this time, that such other pending claims or proceedings will not have a material effect on its financial statements. For claims within its insurance program, the Company retains the risk of loss, up to certain limits, for matters related to automobile liability, general liability (including damages associated with underground facility locating services), workers’ compensation, and employee group health. The Company has established reserves that it believes to be adequate based on current evaluations and experience with these types of claims. For these claims, the effect on the Company’s financial statements is generally limited to the amount needed to satisfy insurance deductibles or retentions. Commitments Performance Bonds and Guarantees. The Company has obligations under performance and other surety contract bonds related to certain of its customer contracts. Performance bonds generally provide a customer with the right to obtain payment and/or performance from the issuer of the bond if the Company fails to perform its contractual obligations. As of October 28, 2017 and July 29, 2017 , the Company had $119.6 million and $118.2 million of outstanding performance and other surety contract bonds, respectively. The Company periodically guarantees certain obligations of its subsidiaries, including obligations in connection with obtaining state contractor licenses and leasing real property and equipment. Letters of Credit. The Company has standby letters of credit issued under its Credit Agreement as part of its insurance program. These standby letters of credit collateralize obligations to the Company’s insurance carriers in connection with the settlement of potential claims. As of both October 28, 2017 and July 29, 2017 , the Company had $48.7 million of outstanding standby letters of credit issued under the Credit Agreement.

Basis of Presentation and Acc25

Basis of Presentation and Accounting Policies (Policies)	3 Months Ended
	Oct. 28, 2017
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Dycom Industries, Inc. (“Dycom” or the “Company”) is a leading provider of specialty contracting services throughout the United States and in Canada. The Company provides program management, engineering, construction, maintenance and installation services for telecommunications providers, underground facility locating services for various utilities, including telecommunications providers, and other construction and maintenance services for electric and gas utilities. The accompanying unaudited condensed consolidated financial statements of the Company and its subsidiaries, all of which are wholly-owned, have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X of the Securities and Exchange Commission (“SEC”). Accordingly, they do not include all of the information and notes required by GAAP for annual financial statements and should be read in conjunction with Management’s Discussion and Analysis of Financial Condition and Results of Operations contained in this report and the Company’s audited financial statements for the fiscal year ended July 29, 2017 included in the Company’s Annual Report on Form 10-K for the fiscal year ended July 29, 2017 , filed with the SEC on September 1, 2017. In the opinion of management, all adjustments considered necessary for a fair statement of the results for the interim periods presented have been included. This includes all normal and recurring adjustments and elimination of intercompany accounts and transactions. Operating results for the interim period are not necessarily indicative of the results expected for any subsequent interim or annual period.
Segment Information	Segment Information. The Company operates in one reportable segment. Its services are provided by its operating segments on a decentralized basis. Each operating segment consists of a subsidiary (or in certain instances, the combination of two or more subsidiaries). Management of the operating segments report to the Company’s Chief Operating Officer who reports to the Chief Executive Officer, the chief operating decision maker. All of the Company’s operating segments have been aggregated into one reportable segment based on their similar economic characteristics, nature of services and production processes, type of customers, and service distribution methods. The Company’s operating segments provide services throughout the United States and in Canada. Revenues from services provided in Canada were not material during the three months ended October 28, 2017 and October 29, 2016 . Additionally, the Company had no material long-lived assets in Canada as of October 28, 2017 or July 29, 2017 .
Accounting Period	Accounting Period. The Company’s fiscal 2017 year ended on the last Saturday in July. In September 2017, the Company’s Board of Directors approved a change in the Company’s fiscal year end from July to January. Beginning with a six-month transition period ending January 27, 2018, the Company’s fiscal year will end on the last Saturday of January. The Company will file a transition report on Form 10-K containing audited financial statements for the six month period from July 30, 2017 to January 27, 2018. After the transition period, each fiscal year will consist of either 52 or 53 weeks of operations (with the additional week of operations occurring in the fourth fiscal quarter). The Company’s 2019 fiscal year will commence on January 28, 2018.
Use of Estimates	There have been no material changes to the Company’s significant accounting policies and critical accounting estimates described in the Company’s Annual Report on Form 10-K for the year ended July 29, 2017 . Use of Estimates. The preparation of financial statements in conformity with GAAP requires management to make certain estimates and assumptions that affect the amounts reported in these condensed consolidated financial statements and accompanying notes. These estimates are based on the Company’s historical experience and management’s understanding of current facts and circumstances. At the time they are made, the Company believes that such estimates are fair when considered in conjunction with the consolidated financial position and results of operations taken as a whole. However, actual results could differ materially from those estimates.
Revenue Recognition	Revenue Recognition. The Company performs a substantial majority of its services under master service agreements and other agreements that contain customer-specified service requirements, having discrete pricing for individual tasks. Revenue is recognized under these arrangements based on units-of-delivery as each unit is completed. The remainder of the Company’s services, representing less than 5% of its contract revenues during each of the three months ended October 28, 2017 and October 29, 2016 , are performed under contracts using the cost-to-cost measure of the percentage of completion method of accounting. Revenue is recognized under these arrangements based on the ratio of contract costs incurred to date to total estimated contract costs. For contracts using the cost-to-cost measure of the percentage of completion method of accounting, the Company accrues the entire amount of a contract loss at the time the loss is determined to be probable and can be reasonably estimated. During the three months ended October 28, 2017 and October 29, 2016 , there were no material impacts to the Company’s results of operations due to changes in contract estimates. There were no material amounts of unapproved change orders or claims recognized during the three months ended October 28, 2017 or October 29, 2016 . The current asset “Costs and estimated earnings in excess of billings” represents revenues recognized in excess of amounts billed. The current liability “Billings in excess of costs and estimated earnings” represents billings in excess of revenues recognized.
Fair Value of Financial Instruments	Fair Value of Financial Instruments. The Company’s financial instruments primarily consist of cash and equivalents, restricted cash, accounts receivable, income taxes receivable and payable, accounts payable, certain accrued expenses, and long-term debt. The carrying amounts of these items approximate fair value due to their short maturity, except for the Company’s long-term debt, which is based on observable market-based inputs (Level 2). See Note 11, Debt , for further information regarding the fair value of such financial instruments. The Company’s cash and equivalents are based on quoted market prices in active markets for identical assets (Level 1) as of October 28, 2017 and July 29, 2017 . During the three months ended October 28, 2017 and October 29, 2016 , the Company had no material nonrecurring fair value measurements of assets or liabilities subsequent to their initial recognition.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements Recently Adopted Accounting Standards Income Taxes. In November 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2015-17, Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes (“ASU 2015-17”). ASU 2015-17 simplifies the presentation of deferred income taxes by requiring that deferred tax liabilities and assets are solely classified as non-current in a consolidated statement of financial position. The Company adopted ASU 2015-17 on a prospective basis effective July 30, 2017, the first day of the fiscal quarter ended October 28, 2017 . As a result of this adoption, Deferred tax liabilities, net non-current is presented net of approximately $28.2 million of deferred tax assets within the condensed consolidated balance sheets as of October 28, 2017 . Under the previous guidance, these deferred tax assets would have been classified as current. No prior periods have been retrospectively adjusted. Stock Compensation. In March 2016, the FASB issued ASU No. 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”) with the intention of simplifying accounting for share-based payment transactions. The Company adopted ASU 2016-09 effective July 30, 2017, the first day of the fiscal quarter ended October 28, 2017 . Under the amended guidance, excess tax benefits (“windfalls”) or tax deficiencies (“shortfalls”) are recognized in the Company’s provision for income taxes in the consolidated statements of operations rather than as additional paid-in capital in the consolidated balance sheets. Additionally, windfalls and shortfalls are presented as operating cash flows rather than financing activities. As a result of the amended guidance, the Company recognized approximately $0.9 million of windfalls as a reduction to income tax expense in the condensed consolidated statements of operations during the fiscal quarter ended October 28, 2017 . Additionally, this amount was presented as operating cash flows rather than as financing activities during the fiscal quarter ended October 28, 2017 . Because windfalls are no longer recognized in additional paid-in capital, the amount is excluded from the hypothetical proceeds used to repurchase shares when computing diluted earnings per common share under the treasury stock method. As a result of the amended guidance, diluted shares increased by approximately 169,000 shares during the fiscal quarter ended October 28, 2017 . The inclusion of windfalls and shortfalls as a component of income tax expense or benefit during the period in which they occur will increase the volatility of the Company’s provision for income taxes. The amount of windfalls and shortfalls recognized will be dependent on the volume of share-based award vesting or exercise activity as well as the Company’s stock price at the dates on which stock-based awards vest or are exercised. In accordance with ASU 2016-09, these changes have been applied prospectively and prior periods have not been adjusted. The other components of ASU 2016-09 did not have a material effect on the Company’s condensed consolidated financial statements. See Note 2, Computation of Earnings Per Share , Note 12, Income Taxes , and Note 15, Stock-Based Awards for additional disclosure related to the effects of ASU 2016-09. The Company also adopted the following Accounting Standards Updates during the fiscal quarter ended October 28, 2017 , neither of which had a material effect on the Company’s condensed consolidated financial statements: Standard Adoption Date 2015-11 Inventory (Topic 330): Simplifying the Measurement of Inventory July 30, 2017 2017-09 Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting July 30, 2017 Accounting Standards Not Yet Adopted There were no accounting pronouncements issued during the fiscal quarter ended October 28, 2017 that are significant or potentially significant to the Company. In addition, there have been no changes in the expected dates of adoption or estimated effects on the Company’s consolidated financial statements of recently issued accounting pronouncements from those disclosed in the Company’s Annual Report on Form 10-K for the fiscal year ended July 29, 2017 filed with the SEC on September 1, 2017 . Revenue Recognition. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), requiring entities to recognize revenue to depict the transfer of control of promised goods or services to customers in an amount that reflects the consideration the entity expects to be entitled to receive in exchange for those goods or services. In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date (“ASU 2015-14”), which defers the effective date of the new revenue standard. In 2016, the FASB issued several updates to clarify certain topics within the standard. ASU No. 2014-09 and the related updates are referred to herein as “ASU 2014-09”. The Company continues to evaluate the effect of ASU 2014-09 on its systems, business processes, controls, disclosures, and consolidated financial statements. This assessment involves the comparison of representative contracts with customers with requirements of the new standard and historical accounting practices. Based on the results of the contract reviews performed to date, the Company is expecting to recognize the substantial majority of its revenue from master service agreements and other agreements that contain customer-specified service requirements, recognized over time, using the units-of-delivery input method under ASU 2014-09. For the remainder of the Company’s contracts, representing less than 5% of its contract revenues during the fiscal quarter ended October 28, 2017, the Company is expecting to use a cost-to-cost measurement of revenue, recognized over time, based on the ratio of contract costs incurred to date to total estimated contract costs. The Company expects that the amount and timing of revenue recognition under ASU 2014-09 will not materially differ from the Company’s historic accounting practices. ASU 2014-09 must be applied using either a full retrospective approach or a modified (cumulative effect) retrospective approach. The Company anticipates adopting ASU 2014-09 under the modified (cumulative effect) retrospective approach. Under this approach, ASU 2014-09 would apply to all new contracts initiated on or after January 28, 2018. For existing contracts with remaining performance obligations as of January 28, 2018, a cumulative effect adjustment to the opening retained earnings balance would be recognized for those contracts, as the difference between the current revenue recognition practices and the criteria required by ASU 2014-09. ASU 2014-09 is effective for fiscal years beginning after December 15, 2017. The Company will adopt ASU 2014-09 as of January 28, 2018, the first day of fiscal 2019. The Company has not yet quantified the potential impact of adopting ASU 2014-09; however, based on contracts evaluated to date, the adoption is not expected to have a material impact on the timing or amount of revenue recognized under contracts with customers, as compared to current revenue recognition practices. The Company expects the cumulative impact adjustment to opening retained earnings to be immaterial, with an immaterial impact to the Company’s net income on an ongoing basis. Prior periods will not be retrospectively adjusted. This expectation may change as the process to assess the impact is still ongoing. The Company expects to complete the assessment of the impact of ASU 2014-09 during the fiscal quarter ending January 27, 2018.

Computation of Earnings Per C26

Computation of Earnings Per Common Share (Tables)	3 Months Ended
	Oct. 28, 2017
Earnings Per Share [Abstract]
Schedule of Earnings Per Share Reconciliation	The following table sets forth the computation of basic and diluted earnings per common share (dollars in thousands, except per share amounts): For the Three Months Ended October 28, 2017 October 29, 2016 Net income available to common stockholders (numerator) $ 28,776 $ 51,050 Weighted-average number of common shares (denominator) 31,061,448 31,429,493 Basic earnings per common share $ 0.93 $ 1.62 Weighted-average number of common shares 31,061,448 31,429,493 Potential shares of common stock arising from stock options, and unvested restricted share units (1) 830,126 770,794 Total shares-diluted (denominator) 31,891,574 32,200,287 Diluted earnings per common share $ 0.90 $ 1.59 (1) As discussed in Note 1, Basis of Presentation and Accounting Policies , the Company has adopted ASU 2016-09. Under the amended guidance, windfalls or shortfalls are recognized in the Company’s provision for income taxes in the consolidated statements of operations rather than as additional paid-in capital in the consolidated balance sheets. Because windfalls are no longer recognized in additional paid-in capital, the amount is excluded from the hypothetical proceeds used to repurchase shares when computing diluted earnings per common share under the treasury stock method. As a result of the amended guidance, diluted shares increased by approximately 169,000 shares during the fiscal quarter ended October 28, 2017 .
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The weighted-average number of common shares outstanding used in the computation of diluted earnings per common share excludes the effect of the following instruments because their inclusion would have been anti-dilutive: For the Three Months Ended October 28, 2017 October 29, 2016 Stock-based awards 125,074 41,302 0.75% convertible senior notes due 2021 5,005,734 5,005,734 Warrants 5,005,734 5,005,734 Total anti-dilutive weighted shares excluded from the calculation of earnings per common share 10,136,542 10,052,770

Acquisitions (Tables)

Acquisitions (Tables)	3 Months Ended
	Oct. 28, 2017
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The preliminary purchase price allocation of Texstar is as follows (dollars in millions): Assets Accounts receivable $ 8.8 Costs and estimated earnings in excess of billings 2.4 Inventories and other current assets 0.3 Property and equipment 5.6 Goodwill 10.1 Intangible assets - customer relationships 9.8 Intangible assets - trade names and other 0.7 Total assets 37.7 Liabilities Accounts payable 3.2 Accrued and other current liabilities 3.4 Deferred tax liabilities, net non-current 5.0 Total liabilities 11.6 Net Assets Acquired $ 26.1

Accounts Receivable (Tables)

Accounts Receivable (Tables)	3 Months Ended
	Oct. 28, 2017
Receivables [Abstract]
Schedule of Accounts Receivable	Accounts receivable consisted of the following (dollars in thousands): October 28, 2017 July 29, 2017 Contract billings $ 326,666 $ 348,990 Retainage 22,056 21,645 Total 348,722 370,635 Less: allowance for doubtful accounts (995 ) (835 ) Accounts receivable, net $ 347,727 $ 369,800

Costs and Estimated Earnings 29

Costs and Estimated Earnings in Excess of Billings (Tables)	3 Months Ended
	Oct. 28, 2017
Contractors [Abstract]
Costs and Estimated Earnings in Excess of Billings, Net	Costs and estimated earnings in excess of billings (“CIEB”) includes revenue for services performed under contracts using the units-of-delivery method of accounting and the cost-to-cost measure of the percentage of completion method of accounting. Amounts consisted of the following (dollars in thousands): October 28, 2017 July 29, 2017 Costs incurred on contracts in progress $ 351,361 $ 327,312 Estimated to date earnings 92,523 92,781 Total costs and estimated earnings 443,884 420,093 Less: billings to date (43,966 ) (40,091 ) $ 399,918 $ 380,002 Included in the accompanying condensed consolidated balance sheets under the captions: Costs and estimated earnings in excess of billings $ 406,517 $ 389,286 Billings in excess of costs and estimated earnings (6,599 ) (9,284 ) $ 399,918 $ 380,002

Other Current Assets and Othe30

Other Current Assets and Other Assets (Tables)	3 Months Ended
	Oct. 28, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Other Current Assets	Other current assets consisted of the following (dollars in thousands): October 28, 2017 July 29, 2017 Prepaid expenses $ 17,488 $ 10,588 Receivables on equipment sales 908 2,761 Deposits and other current assets 11,314 10,254 Total other current assets $ 29,710 $ 23,603
Schedule of Non current Assets	Other assets (long-term) consisted of the following (dollars in thousands): October 28, 2017 July 29, 2017 Deferred financing costs $ 4,319 $ 4,797 Restricted cash 5,408 5,408 Insurance recoveries for accrued insurance claims 14,135 9,243 Other non-current deposits and assets 12,891 13,925 Total other assets $ 36,753 $ 33,373

Property and Equipment (Tables)

Property and Equipment (Tables)	3 Months Ended
	Oct. 28, 2017
Property, Plant and Equipment [Abstract]
Schedule of Property and Equipment	Property and equipment consisted of the following (dollars in thousands): Estimated Useful Lives (Years) October 28, 2017 July 29, 2017 Land — $ 3,470 $ 3,470 Buildings 10-35 12,255 12,073 Leasehold improvements 1-10 13,985 13,912 Vehicles 1-5 505,327 496,820 Computer hardware and software 1-7 111,388 107,779 Office furniture and equipment 1-10 13,190 12,226 Equipment and machinery 1-10 291,454 288,993 Total 951,069 935,273 Less: accumulated depreciation (527,739 ) (513,166 ) Property and equipment, net $ 423,330 $ 422,107 Depreciation expense was $36.4 million and $28.4 million for the three months ended October 28, 2017 and October 29, 2016 , respectively.

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	3 Months Ended
	Oct. 28, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The Company’s goodwill balance was $321.8 million and $321.7 million as of October 28, 2017 and July 29, 2017 , respectively. Changes in the carrying amount of goodwill during the three months ended October 28, 2017 were as follows (dollars in thousands): Goodwill Accumulated Impairment Losses Total Balance as of July 29, 2017 $ 517,515 $ (195,767 ) $ 321,748 Purchase price allocation adjustments 35 — 35 Balance as of October 28, 2017 $ 517,550 $ (195,767 ) $ 321,783
Schedule of Intangible Assets	The Company’s intangible assets consisted of the following (dollars in thousands): October 28, 2017 July 29, 2017 Weighted Average Remaining Useful Lives (Years) Gross Carrying Amount Accumulated Amortization Intangible Assets, Net Gross Carrying Amount Accumulated Amortization Intangible Assets, Net Customer relationships 11.8 $ 299,717 $ 129,966 $ 169,751 $ 299,717 $ 124,084 $ 175,633 Trade names 8.2 10,350 7,656 2,694 10,350 7,285 3,065 UtiliQuest trade name — 4,700 — 4,700 4,700 — 4,700 Non-compete agreements 2.3 450 309 141 450 287 163 $ 315,217 $ 137,931 $ 177,286 $ 315,217 $ 131,656 $ 183,561

Other Accrued Liabilities (Tabl

Other Accrued Liabilities (Tables)	3 Months Ended
	Oct. 28, 2017
Payables and Accruals [Abstract]
Schedule of Other Accrued Liabilities	Other accrued liabilities consisted of the following (dollars in thousands): October 28, 2017 July 29, 2017 Accrued payroll and related taxes $ 26,006 $ 24,554 Accrued employee benefit and incentive plan costs 12,430 42,135 Accrued construction costs 29,316 29,942 Other current liabilities 16,339 16,972 Total other accrued liabilities $ 84,091 $ 113,603

Debt (Tables)

Debt (Tables)	3 Months Ended
	Oct. 28, 2017
Debt Disclosure [Abstract]
Outstanding Indebtedness	The Company’s outstanding indebtedness consisted of the following (dollars in thousands): October 28, 2017 July 29, 2017 Credit Agreement - Revolving facility (matures April 2020) $ — $ — Credit Agreement - Term loan facilities (mature April 2020) 362,875 367,688 0.75% convertible senior notes, net (mature September 2021) 397,196 392,233 760,071 759,921 Less: current portion (24,063 ) (21,656 ) Long-term debt $ 736,008 $ 738,265
Schedule Interest Rates for the Credit Agreement	Borrowings under the Credit Agreement bear interest at rates described below based upon the Company’s consolidated leverage ratio, which is the ratio of the Company’s consolidated total funded debt to its trailing twelve month consolidated EBITDA, as defined by the Credit Agreement. In addition, the Company incurs certain fees for unused balances and letters of credit at the rates described below, also based upon the Company’s consolidated leverage ratio: Borrowings - Eurodollar Rate Loans 1.25% - 2.00% plus LIBOR Borrowings - Base Rate Loans 0.25% - 1.00% plus administrative agent’s base rate (1) Unused Revolver Commitment 0.25% - 0.40% Standby Letters of Credit 1.25% - 2.00% Commercial Letters of Credit 0.625% - 1.00% (1) The agent’s base rate is described in the Credit Agreement as the highest of (i) the administrative agent’s prime rate, (ii) the Federal Funds Rate plus 0.50% , and (iii) the Eurodollar rate plus 1.00% , plus an applicable margin. The weighted average interest rates and fees for balances under the Credit Agreement as of October 28, 2017 and July 29, 2017 were as follows: Weighted Average Rate End of Period October 28, 2017 July 29, 2017 Borrowings - Term loan facilities 2.99% 2.98% Borrowings - Revolving facility (1) —% —% Standby Letters of Credit 1.75% 1.75% Unused Revolver Commitment 0.35% 0.35% (1) There were no outstanding borrowings under the revolving facility as of October 28, 2017 or July 29, 2017 .
Convertible Debt	The liability component of the Notes consisted of the following (dollars in thousands): October 28, 2017 July 29, 2017 Liability component Principal amount of 0.75% convertible senior notes due September 2021 $ 485,000 $ 485,000 Less: Debt discount (79,522 ) (84,069 ) Less: Debt issuance costs (8,282 ) (8,698 ) Net carrying amount of Notes $ 397,196 $ 392,233

Other Income, Net (Tables)

Other Income, Net (Tables)	3 Months Ended
	Oct. 28, 2017
Other Income and Expenses [Abstract]
Schedule of Other Income, Net	The components of other income, net, were as follows (dollars in thousands): For the Three Months Ended October 28, 2017 October 29, 2016 Gain on sale of fixed assets $ 6,495 $ 1,443 Miscellaneous expense, net (564 ) (503 ) Total other income, net $ 5,931 $ 940

Capital Stock (Tables)

Capital Stock (Tables)	3 Months Ended
	Oct. 28, 2017
Stockholders' Equity Note [Abstract]
Schedule of Share Repurchases Under Current and Previously Authorized Share Repurchase Programs	Repurchases of Common Stock. The Company made the following share repurchases during fiscal 2017 and the three months ended October 28, 2017 : Period Number of Shares Repurchased Total Consideration (In thousands) Average Price Per Share Fiscal 2017 713,006 $ 62,909 $ 88.23 Three months ended October 28, 2017 200,000 $ 16,875 $ 84.38

Stock-Based Awards (Tables)

Stock-Based Awards (Tables)	3 Months Ended
	Oct. 28, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Stock-based Compensation Expense and Related Tax Benefit Recognized	Stock-based compensation expense and the related tax benefit recognized related to stock options and restricted share units during the three months ended October 28, 2017 and October 29, 2016 were as follows (dollars in thousands): For the Three Months Ended October 28, 2017 October 29, 2016 Stock-based compensation $ 7,380 $ 5,707 Related tax benefit for stock-based compensation $ 2,882 $ 2,183 In addition, as a result of the Company’s adoption of ASU 2016-09, the Company recognized approximately $0.9 million of certain tax benefits from share-based award activities during the three months ended October 28, 2017 .
Schedule of Share-based Compensation, Stock Options Award Activity	The following table summarizes stock option award activity during the three months ended October 28, 2017 : Stock Options Shares Weighted Average Exercise Price Outstanding as of July 29, 2017 670,350 $ 25.24 Granted 18,933 $ 85.15 Options exercised (21,325 ) $ 9.57 Canceled — $ — Outstanding as of October 28, 2017 667,958 $ 27.44 Exercisable options as of October 28, 2017 518,053 $ 18.70
Schedule of Share-based Compensation, RSU and Performance RSU Activity	The following table summarizes RSU and Performance RSU award activity during the three months ended October 28, 2017 : Restricted Stock RSUs Performance RSUs Share Units Weighted Average Grant Price Share Units Weighted Average Grant Price Outstanding as of July 29, 2017 187,465 $ 60.71 553,882 $ 67.46 Granted 25,227 $ 85.31 138,261 $ 84.13 Share units vested (9,218 ) $ 62.66 (36,121 ) $ 56.08 Forfeited or canceled — $ — (24,753 ) $ 57.32 Outstanding as of October 28, 2017 203,474 $ 63.67 631,269 $ 72.16

Concentration of Credit Risk (T

Concentration of Credit Risk (Tables)	3 Months Ended
	Oct. 28, 2017
Risks and Uncertainties [Abstract]
Schedule that Represents A Significant Portion of the Company’s Customer Base and Each Over 10% of Total Revenue	Customers whose contract revenues exceeded 10% of total contract revenues during the three months ended October 28, 2017 or October 29, 2016 were as follows: For the Three Months Ended October 28, 2017 October 29, 2016 Comcast Corporation 21.8% 15.1% AT&T Inc. 19.0% 29.0% CenturyLink, Inc. 18.9% 15.7% Verizon Communications Inc. (1) 10.7% 9.4% Customers whose combined amounts of trade accounts receivable and costs and estimated earnings in excess of billings, net (“CIEB, net”) exceeded 10% of total combined trade receivables and CIEB, net as of October 28, 2017 or July 29, 2017 were as follows (dollars in millions): October 28, 2017 July 29, 2017 Amount % of Total Amount % of Total Comcast Corporation $ 170.8 22.9% $ 159.7 21.3% CenturyLink, Inc. $ 130.1 17.4% $ 136.1 18.1% Verizon Communications Inc. (1) $ 84.3 11.3% $ 73.7 9.8% AT&T Inc. $ 83.7 11.2% $ 87.1 11.6% Windstream Corporation $ 72.0 9.6% $ 84.7 11.3% (1) For comparison purposes in the tables above, amounts from Verizon Communications Inc. and XO Communications LLC’s fiber-optic network business have been combined for periods prior to their February 2017 merger.

Basis of Presentation and Acc39

Basis of Presentation and Accounting Policies (Details) shares in Thousands, $ in Millions	3 Months Ended
	Oct. 28, 2017USD ($)segmentshares
Accounting Policies [Abstract]
Number of reportable segments | segment	1
Deferred tax asset	$ 28.2
Effective income tax rate reconciliation, adjustment related to shared based compensation	$ 0.9
Adoption of accounting principled effect on diluted shares | shares	169

Basis of Presentation and Acc40

Basis of Presentation and Accounting Policies - Revenue Recognition (Details)	3 Months Ended
	Oct. 28, 2017	Oct. 29, 2016
Maximum | Revenue Recognized Using Cost To Cost Percentage of Completion Method
Revenue from External Customer [Line Items]
Percentage of Revenue	5.00%	5.00%

Computation of Earnings Per C41

Computation of Earnings Per Common Share - Basic and Diluted Earnings Calculation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Oct. 28, 2017	Oct. 29, 2016
Basic earnings per unit
Net income	$ 28,776	$ 51,050
Weighted-average number of common shares (in shares)	31,061,448	31,429,493
Basic earnings per common share (in dollars per share)	$ 0.93	$ 1.62
Diluted earnings per unit
Weighted-average number of common shares (in shares)	31,061,448	31,429,493
Potential common stock arising from stock options, and unvested restricted share units (in shares)	830,126	770,794
Total shares-diluted (in shares)	31,891,574	32,200,287
Diluted earnings per common share (in dollars per share)	$ 0.90	$ 1.59
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares)	10,136,542	10,052,770
Stock-based awards
Diluted earnings per unit
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares)	125,074	41,302
Convertible senior notes
Diluted earnings per unit
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares)	5,005,734	5,005,734
Warrants
Diluted earnings per unit
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares)	5,005,734	5,005,734

Computation of Earnings Per C42

Computation of Earnings Per Common Share - Narratives (Details) - $ / shares shares in Thousands	3 Months Ended
	Oct. 28, 2017	Sep. 15, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Adoption of accounting principled effect on diluted shares	169
Convertible Note Hedge
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt instrument, convertible, conversion price (per share)	$ 96.89	$ 96.89
0.75% Convertible Senior Notes Due 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt, interest rate (in percent)	0.75%
Debt instrument, convertible, conversion price (per share)		96.89
Class of earrant or right, exercise price of warrants or rights (per warrant)	$ 130.43	$ 130.43

Acquisitions - Narratives (Deta

Acquisitions - Narratives (Details) $ in Millions	1 Months Ended
	Mar. 31, 2017USD ($)
Texstar Enterprises, Inc.
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired	$ 26.1

Acquisitions - Purchase Price A

Acquisitions - Purchase Price Allocation (Details) - Texstar Enterprises, Inc. $ in Millions	Oct. 28, 2017USD ($)
Business Acquisition [Line Items]
Accounts receivable	$ 8.8
Costs and estimated earnings in excess of billings	2.4
Inventories and other current assets	0.3
Property and equipment	5.6
Goodwill	10.1
Total assets	37.7
Accounts payable	3.2
Accrued and other current liabilities	3.4
Deferred tax liabilities, net non-current	5
Total liabilities	11.6
Net Assets Acquired	26.1
Customer relationships
Business Acquisition [Line Items]
Intangible assets	9.8
Trade names
Business Acquisition [Line Items]
Intangible assets	$ 0.7

Accounts Receivable (Details)

Accounts Receivable (Details) - USD ($) $ in Thousands	Oct. 28, 2017	Jul. 29, 2017
Receivables [Abstract]
Contract billings	$ 326,666	$ 348,990
Retainage	22,056	21,645
Total	348,722	370,635
Less: allowance for doubtful accounts	(995)	(835)
Accounts receivable, net	$ 347,727	$ 369,800

Costs and Estimated Earnings 46

Costs and Estimated Earnings in Excess of Billings (Details) - USD ($) $ in Thousands	Oct. 28, 2017	Jul. 29, 2017
Contractors [Abstract]
Costs incurred on contracts in progress	$ 351,361	$ 327,312
Estimated to date earnings	92,523	92,781
Total costs and estimated earnings	443,884	420,093
Less: billings to date	(43,966)	(40,091)
Total costs in excess of billings	399,918	380,002
Included in the accompanying condensed consolidated balance sheets under the captions:
Costs and estimated earnings in excess of billings	406,517	389,286
Billings in excess of costs and estimated earnings	(6,599)	(9,284)
Total costs in excess of billings	$ 399,918	$ 380,002

Other Current Assets and Othe47

Other Current Assets and Other Assets - Current (Details) - USD ($) $ in Thousands	Oct. 28, 2017	Jul. 29, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid expenses	$ 17,488	$ 10,588
Receivables on equipment sales	908	2,761
Deposits and other current assets	11,314	10,254
Total other current assets	$ 29,710	$ 23,603

Other Current Assets and Othe48

Other Current Assets and Other Assets - Non-current (Details) - USD ($) $ in Thousands	Oct. 28, 2017	Jul. 29, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred financing costs	$ 4,319	$ 4,797
Restricted cash	5,408	5,408
Insurance recoveries for accrued insurance claims	14,135	9,243
Other non-current deposits and assets	12,891	13,925
Total other assets	$ 36,753	$ 33,373

Property and Equipment (Details

Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 28, 2017	Jul. 29, 2017
Property, Plant and Equipment [Line Items]
Total	$ 951,069	$ 935,273
Less: accumulated depreciation	(527,739)	(513,166)
Property and equipment, net	423,330	422,107
Land
Property, Plant and Equipment [Line Items]
Total	3,470	3,470
Buildings
Property, Plant and Equipment [Line Items]
Total	$ 12,255	12,073
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	10 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	35 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total	$ 13,985	13,912
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	1 year
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	10 years
Vehicles
Property, Plant and Equipment [Line Items]
Total	$ 505,327	496,820
Vehicles | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	1 year
Vehicles | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	5 years
Computer hardware and software
Property, Plant and Equipment [Line Items]
Total	$ 111,388	107,779
Computer hardware and software | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	1 year
Computer hardware and software | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	7 years
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Total	$ 13,190	12,226
Office furniture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	1 year
Office furniture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	10 years
Equipment and machinery
Property, Plant and Equipment [Line Items]
Total	$ 291,454	$ 288,993
Equipment and machinery | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	1 year
Equipment and machinery | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	10 years

Property and Equipment - Deprec

Property and Equipment - Depreciation Expense and Repairs (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 28, 2017	Oct. 29, 2016
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 36.4	$ 28.4

Goodwill and Intangible Asset51

Goodwill and Intangible Assets - Narratives (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 28, 2017	Oct. 29, 2016	Jul. 29, 2017
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 321,783		$ 321,748
Amortization of intangible assets	$ 6,300	$ 6,200

Goodwill and Intangible Asset52

Goodwill and Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 28, 2017	Jul. 29, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill gross	$ 517,550	$ 517,515
Accumulated impairment losses	(195,767)	$ (195,767)
Beginning balance	321,748
Purchase price allocation adjustments	35
Ending balance	$ 321,783

Goodwill and Intangible Asset53

Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 28, 2017	Jul. 29, 2017
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	$ 315,217	$ 315,217
Accumulated Amortization	137,931	131,656
Intangible Assets, Net	177,286	183,561
UtiliQuest
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	4,700	4,700
Intangible Assets, Net	$ 4,700	4,700
Customer relationships
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Weighted average remaining useful lives (in years)	11 years 9 months
Intangible Assets, Gross (Excluding Goodwill)	$ 299,717	299,717
Accumulated Amortization	129,966	124,084
Intangible Assets, Net	$ 169,751	175,633
Trade names
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Weighted average remaining useful lives (in years)	8 years 2 months
Intangible Assets, Gross (Excluding Goodwill)	$ 10,350	10,350
Accumulated Amortization	7,656	7,285
Intangible Assets, Net	$ 2,694	3,065
Non-compete agreements
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Weighted average remaining useful lives (in years)	2 years 3 months
Intangible Assets, Gross (Excluding Goodwill)	$ 450	450
Accumulated Amortization	309	287
Intangible Assets, Net	$ 141	$ 163

Accrued Insurance Claims (Detai

Accrued Insurance Claims (Details)	Oct. 28, 2017USD ($)state	Jul. 29, 2017USD ($)
Accrued Insurance Claims [Line Items]
Number of states with state-sponsored insurance fund | state	2
Aggregate stop loss coverage for automobile liability, general liability, and workers' compensation claims before adjustment	$ 67,100,000
Insurance liability, annual retained risk loss	400,000
Accrued insurance	109,200,000	$ 101,900,000
Accrued insurance claims, Noncurrent	60,782,000	62,007,000
Insurance recoveries for accrued insurance claims	14,135,000	9,243,000
Other Noncurrent assets
Accrued Insurance Claims [Line Items]
Insurance recoveries for accrued insurance claims	14,100,000	$ 9,200,000
Maximum
Accrued Insurance Claims [Line Items]
Retained risk of loss, general liability and workers' compensation, maximum automobile liability	$ 1,000,000

Other Accrued Liabilities (Deta

Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Oct. 28, 2017	Jul. 29, 2017
Payables and Accruals [Abstract]
Accrued payroll and related taxes	$ 26,006	$ 24,554
Accrued employee benefit and incentive plan costs	12,430	42,135
Accrued construction costs	29,316	29,942
Other current liabilities	16,339	16,972
Total other accrued liabilities	$ 84,091	$ 113,603

Debt - Schedule of Debt (Detail

Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Oct. 28, 2017	Jul. 29, 2017
Debt Instrument [Line Items]
Debt and capital lease obligations	$ 760,071	$ 759,921
Less: current portion	(24,063)	(21,656)
Long-term debt	736,008	738,265
0.75% Convertible Senior Notes Due 2021
Debt Instrument [Line Items]
Debt and capital lease obligations	$ 397,196	392,233
Debt, interest rate (in percent)	0.75%
Credit Agreement - Revolving facility (matures April 2020)
Debt Instrument [Line Items]
Debt and capital lease obligations	$ 0	0
Credit Agreement - Term Loan (matures April 2020)
Debt Instrument [Line Items]
Debt and capital lease obligations	$ 362,875	$ 367,688

Debt - Senior Credit Agreement

Debt - Senior Credit Agreement (Details)	Sep. 09, 2015USD ($)	Oct. 28, 2017USD ($)	Jul. 29, 2017USD ($)
Line of Credit Facility [Line Items]
Debt instrument, covenant compliance, consolidated leverage ratio, maximum		3.50
Letters of credit outstanding amount		$ 48,700,000	$ 48,700,000
Debt instrument, covenant compliance, consolidated interest coverage ratio, maximum		3
Additional borrowing availability		$ 401,300,000	$ 401,300,000
Standby Letters of Credit
Line of Credit Facility [Line Items]
Line of credit current borrowing capacity	$ 200,000,000
Incremental Facility, Minimum
Line of Credit Facility [Line Items]
Debt instrument, face amount	150,000,000
Credit Agreement - Term Loan (matures April 2020)
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 385,000,000
Debt instrument, covenant compliance, consolidated leverage ratio, maximum	2.25
Credit Agreement - Revolving facility (matures April 2020)
Line of Credit Facility [Line Items]
Line of credit current borrowing capacity	$ 450,000,000

Debt - Interest Rates of the Cr

Debt - Interest Rates of the Credit Agreement (Details)	3 Months Ended
	Oct. 28, 2017	Jul. 29, 2017
Credit Agreement - Revolving facility (matures April 2020)
Line of Credit Facility [Line Items]
Unutilized commitment fee (in percent)	0.35%	0.35%
Minimum | Standby Letters of Credit
Line of Credit Facility [Line Items]
Unutilized commitment fee (in percent)	1.25%
Minimum | Commercial Letters of Credit
Line of Credit Facility [Line Items]
Unutilized commitment fee (in percent)	0.625%
Minimum | Credit Agreement - Revolving facility (matures April 2020)
Line of Credit Facility [Line Items]
Unutilized commitment fee (in percent)	0.25%
Maximum | Standby Letters of Credit
Line of Credit Facility [Line Items]
Unutilized commitment fee (in percent)	2.00%
Maximum | Commercial Letters of Credit
Line of Credit Facility [Line Items]
Unutilized commitment fee (in percent)	1.00%
Maximum | Credit Agreement - Revolving facility (matures April 2020)
Line of Credit Facility [Line Items]
Unutilized commitment fee (in percent)	0.40%
Eurodollar
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.00%
Eurodollar | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.25%
Eurodollar | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.00%
Administrative Agent Base Rate | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.25%
Administrative Agent Base Rate | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.00%
Federal Funds
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.50%

Debt - Interest Rates at Period

Debt - Interest Rates at Period End (Details) - USD ($)	3 Months Ended
	Oct. 28, 2017	Jul. 29, 2017
Standby Letters of Credit
Line of Credit Facility [Line Items]
Debt instrument, effective interest rate	1.75%	1.75%
Line of credit	$ 0	$ 0
Credit Agreement - Term Loan (matures April 2020)
Line of Credit Facility [Line Items]
Debt instrument, effective interest rate	2.99%	2.98%
Credit Agreement - Revolving facility (matures April 2020)
Line of Credit Facility [Line Items]
Debt instrument, effective interest rate	0.00%	0.00%
Unutilized commitment fee (in percent)	0.35%	0.35%

Debt - Convertible Senior Notes

Debt - Convertible Senior Notes Due 2021 (Details)	Sep. 15, 2015USD ($)$ / shares	Oct. 28, 2017USD ($)	Oct. 29, 2016USD ($)	Oct. 24, 2015trading_day	Jul. 29, 2017USD ($)
Debt Instrument [Line Items]
Amortization of debt discount		$ 4,547,000	$ 4,307,000
0.75% Convertible Senior Notes Due 2021
Debt Instrument [Line Items]
Debt instrument, face amount	$ 485,000,000	$ 485,000,000			$ 485,000,000
Debt, interest rate (in percent)		0.75%
Debt instrument conversion ratio	0.0103211
Debt instrument, convertible, conversion price (per share) | $ / shares	$ 96.89
Convertible debt, trading day threshold | trading_day				20
Convertible debt, consecutive trading day threshold				30 days
Convertible debt, percentage of stock trigger price threshold				130.00%
Convertible debt, measurement period for consecutive periods threshold				5 days
Convertible debt, measurement for consecutive periods threshold				5 days
Convertible debt, measurement period for percentage of product sale price of common stock and applicable conversion threshold				98.00%
Convertible debt, comparable yield		5.50%
Amortization of debt discount		$ 4,500,000	$ 4,300,000
Long-termdebt, fair value		481,800,000			474,500,000
Convertible Debt		397,196,000			392,233,000
Unamortized discount		79,522,000			84,069,000
Debt issuance cost		$ 8,282,000			$ 8,698,000

Debt - Components of the Conver

Debt - Components of the Convertible Notes (Details) - USD ($)	3 Months Ended
	Oct. 28, 2017	Oct. 29, 2016	Jul. 29, 2017	Sep. 15, 2015
Debt Instrument [Line Items]
Equity component of 0.75% senior convertible notes due 2021, net	$ 112,600,000
Amortization of debt discount	4,547,000	$ 4,307,000
0.75% Convertible Senior Notes Due 2021
Debt Instrument [Line Items]
Debt instrument, face amount	485,000,000		$ 485,000,000	$ 485,000,000
Debt Instrument, Unamortized Discount	(79,522,000)		(84,069,000)
Debt issuance cost	(8,282,000)		(8,698,000)
Net carrying amount of Notes	397,196,000		$ 392,233,000
Amortization of debt discount	$ 4,500,000	$ 4,300,000

Debt - Convertible Note Hedge a

Debt - Convertible Note Hedge and Warrant Transactions (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	Oct. 28, 2017	Sep. 15, 2015
Convertible Note Hedge
Debt Instrument [Line Items]
Derivative, Number of Instruments Held		5,006
Debt instrument, convertible, conversion price (per share)	$ 96.89	$ 96.89
Deferred Tax Liabilities, Derivatives		$ 43.4
Deferred Tax Assets, Derivative Instruments		$ 43.2
0.75% Convertible Senior Notes Due 2021
Debt Instrument [Line Items]
Debt instrument, convertible, conversion price (per share)		$ 96.89
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (shares)		5,006
Class of earrant or right, exercise price of warrants or rights (per warrant)	$ 130.43	$ 130.43

Income Taxes - Narratives (Deta

Income Taxes - Narratives (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 28, 2017	Jul. 29, 2017
Income Tax Disclosure [Abstract]
Deferred tax asset	$ 28.2
Effective income tax rate reconciliation, adjustment related to shared based compensation	0.9
Unrecognized tax benefits	3.1	$ 3.1
Payment of interest and penalties accrued	$ 1.2	$ 1.2

Other Income, Net (Details)

Other Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 28, 2017	Oct. 29, 2016
Other Income and Expenses [Abstract]
Gain on sale of fixed assets	$ 6,495	$ 1,443
Miscellaneous expense, net	(564)	(503)
Total other income, net	5,931	940
Other financial services costs	$ 700	$ 600

Capital Stock - Repurchase of C

Capital Stock - Repurchase of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Oct. 28, 2017	Oct. 29, 2016	Jul. 29, 2017
Stockholders' Equity Note [Abstract]
Repurchase of common stock, shares	200,000		713,006
Total Consideration (In thousands)	$ 16,875	$ 0	$ 62,909
Average Price Per Share (in dollars per share)	$ 84.38		$ 88.23

Capital Stock - Narratives (Det

Capital Stock - Narratives (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Oct. 28, 2017	Oct. 29, 2016	Jul. 29, 2017
Equity, Class of Treasury Stock [Line Items]
Remaining authorized shares for repurchases (shares)	$ 95.2
Cumulative effect on retained earnings	$ 6.9		$ 42.8
Shares paid for tax withholding for share based compensation	15,918	16,290
Value of shares paid for tax withholding for share based compensation	$ 1.3	$ 1.4

Stock-Based Awards - Tax Benefi

Stock-Based Awards - Tax Benefit Recognized (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 28, 2017	Oct. 29, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based compensation	$ 7,380	$ 5,707
Related tax benefit for stock-based compensation(1)	2,882	$ 2,183
Effective income tax rate reconciliation, adjustment related to shared based compensation	$ 900

Stock-Based Awards - Narratives

Stock-Based Awards - Narratives (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 28, 2017	Oct. 29, 2016	Jul. 29, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from stock options exercised	$ 204	$ 202
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to stock options	$ 3,200
Total compensation cost not yet recognized, period for recognition	2 years 6 months 1 day
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to stock options	$ 9,500
Total compensation cost not yet recognized, period for recognition	2 years 8 months 1 day
Granted (in shares)	25,227
Forfeited or canceled (in shares)	0
Shares outstanding (in shares)	203,474		187,465
Share units vested (in shares)	9,218
Performance RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to stock options	$ 22,100
Total compensation cost not yet recognized, period for recognition	2 years 1 month 1 day
Compensation expense	$ 8,700
RSUs outstanding (in shares)	99,627
Granted (in shares)	138,261
Forfeited or canceled (in shares)	24,753
Shares outstanding (in shares)	631,269		553,882
Share units vested (in shares)	36,121
Target Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding (in shares)	487,635
Supplemental Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	38,634
Forfeited or canceled (in shares)	21,139
Shares outstanding (in shares)	143,634

Stock-Based Awards - Stock Opti

Stock-Based Awards - Stock Options (Details) - Stock Options	3 Months Ended
	Oct. 28, 2017$ / sharesshares
Stock Options, Outstanding [Roll Forward]
Beginning balance (in shares) | shares	670,350
Granted (in shares) | shares	18,933
Options exercised (in shares) | shares	(21,325)
Canceled (in shares) | shares	0
Ending balance (in shares) | shares	667,958
Exercisable options (in shares) | shares	518,053
Stock Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Beginning balance (in dollars per shares) | $ / shares	$ 25.24
Options granted (in dollars per shares) | $ / shares	85.15
Options exercised (in dollars per shares) | $ / shares	9.57
Canceled (in dollars per shares) | $ / shares	0
Ending balance (in dollars per shares) | $ / shares	27.44
Weighted average remaining contractual life, shares exercisable (In years) | $ / shares	$ 18.70

Stock-Based Awards - RSU's and

Stock-Based Awards - RSU's and Performance RSU's (Details)	3 Months Ended
	Oct. 28, 2017$ / sharesshares
RSUs
Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Outstanding [Roll Forward]
Beginning balance (in shares) | shares	187,465
Granted (in shares) | shares	25,227
Share units vested (in shares) | shares	(9,218)
Forfeited or canceled (in shares) | shares	0
Ending balance (in shares) | shares	203,474
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value [Roll Forward]
Beginning balance (in dollars per shares) | $ / shares	$ 60.71
Granted (in dollars per shares) | $ / shares	85.31
Share units vested (in dollars per shares) | $ / shares	62.66
Forfeited or canceled (in dollars per shares) | $ / shares	0
Ending balance (in dollars per shares) | $ / shares	$ 63.67
Performance RSUs
Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Outstanding [Roll Forward]
Beginning balance (in shares) | shares	553,882
Granted (in shares) | shares	138,261
Share units vested (in shares) | shares	(36,121)
Forfeited or canceled (in shares) | shares	(24,753)
Ending balance (in shares) | shares	631,269
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value [Roll Forward]
Beginning balance (in dollars per shares) | $ / shares	$ 67.46
Granted (in dollars per shares) | $ / shares	84.13
Share units vested (in dollars per shares) | $ / shares	56.08
Forfeited or canceled (in dollars per shares) | $ / shares	57.32
Ending balance (in dollars per shares) | $ / shares	$ 72.16

Concentration of Credit Risk -

Concentration of Credit Risk - Narratives (Details) $ in Thousands	3 Months Ended
	Oct. 28, 2017USD ($)customer	Jul. 29, 2017USD ($)
Concentration Risk [Line Items]
Number of customers classified as highly concentrated | customer	5
Accounts receivable, net | $	$ 347,727	$ 369,800
Sales Revenue, Services, Net | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk percentage	10.00%
Sales Revenue, Services, Net | Customer Concentration Risk | Five Unnamed Customers
Concentration Risk [Line Items]
Concentration risk percentage	74.90%
Trade Accounts Receivable and Costs and Estimated Earnings | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk percentage	10.00%

Concentration of Credit Risk 72

Concentration of Credit Risk - Revenue Concentration Risk (Details) - Sales Revenue, Services, Net - Customer Concentration Risk	3 Months Ended
	Oct. 28, 2017	Oct. 29, 2016
Concentration Risk [Line Items]
Concentration risk percentage	10.00%
Five Unnamed Customers
Concentration Risk [Line Items]
Concentration risk percentage	74.90%
Comcast Corporation
Concentration Risk [Line Items]
Concentration risk percentage	21.80%	15.10%
AT&T Inc.
Concentration Risk [Line Items]
Concentration risk percentage	19.00%	29.00%
CenturyLink, Inc.
Concentration Risk [Line Items]
Concentration risk percentage	18.90%	15.70%
Verizon Communications Inc
Concentration Risk [Line Items]
Concentration risk percentage	10.70%	9.40%

Concentration of Credit Risk 73

Concentration of Credit Risk - Trade Receivable Risk (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 28, 2017	Jul. 29, 2017
Concentration Risk [Line Items]
Accounts receivable, net	$ 347,727	$ 369,800
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings
Concentration Risk [Line Items]
Concentration risk percentage	10.00%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | Comcast Corporation
Concentration Risk [Line Items]
Accounts receivable, net	$ 170,800	$ 159,700
Concentration risk percentage	22.90%	21.30%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | CenturyLink, Inc.
Concentration Risk [Line Items]
Accounts receivable, net	$ 130,100	$ 136,100
Concentration risk percentage	17.40%	18.10%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | AT&T Inc.
Concentration Risk [Line Items]
Accounts receivable, net	$ 83,700	$ 87,100
Concentration risk percentage	11.20%	11.60%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | Windstream Corporation
Concentration Risk [Line Items]
Accounts receivable, net	$ 72,000	$ 84,700
Concentration risk percentage	9.60%	11.30%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | Verizon Communications Inc
Concentration Risk [Line Items]
Accounts receivable, net	$ 84,300	$ 73,700
Concentration risk percentage	11.30%	9.80%

Commitment and Contingencies -

Commitment and Contingencies - Narratives (Details) - USD ($) $ in Millions	1 Months Ended			12 Months Ended
	Oct. 28, 2017	Dec. 31, 2016	Jul. 30, 2016	Jul. 29, 2017	Oct. 29, 2016
Loss Contingencies [Line Items]
Loss contingency, estimated loss					$ 13
Loss contingency accrual, payments		$ 0.1
Letters of credit outstanding amount	$ 48.7			$ 48.7
Goodman Networks, Inc. Wireline Operations
Loss Contingencies [Line Items]
Escrow deposit	10
Funds released from escrow				2.5
Payments to Acquire Businesses, Net of Cash Acquired			$ 100.9
Working Capital Adjustment [Member] | Goodman Networks, Inc. Wireline Operations
Loss Contingencies [Line Items]
Business Acquisition, Working Capital Adjustment			$ 6.6
Indemnification Portion Subject to Certain Conditions, Not Less Than Twelve Months | Goodman Networks, Inc. Wireline Operations
Loss Contingencies [Line Items]
Escrow deposit	22.5
Indemnification Portion Subject to Seller Satisfaction of Certain Liabilities | Goodman Networks, Inc. Wireline Operations
Loss Contingencies [Line Items]
Escrow deposit	10
Performance Guarantee and Surety Bond [Member]
Loss Contingencies [Line Items]
Guarantor obligations, carrying value	119.6			$ 118.2
S and N
Loss Contingencies [Line Items]
Damages sought	$ 3.8