Dycom Industries (DY) 10-Q 23 May 19 2020 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Apr. 27, 2019	May 20, 2019
Document and Entity Information [Abstract]
Entity Registrant Name	DYCOM INDUSTRIES INC
Entity Central Index Key	0000067215
Current Fiscal Year End Date	--01-25
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Document Type	10-Q
Entity Emerging Growth Company	false
Entity Small Business	false
Amendment Flag	false
Document Period End Date	Apr. 27, 2019
Entity Common Stock, Shares Outstanding		31,482,973

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Apr. 27, 2019	Jan. 26, 2019
Current assets:
Cash and equivalents	$ 33,579	$ 128,342
Accounts receivable, net	701,522	625,258
Contract assets	297,630	215,849
Inventories	105,166	94,385
Income tax receivable	2,376	3,461
Other current assets	38,242	29,145
Total current assets	1,178,515	1,096,440
Property and equipment, net	429,310	424,751
Operating Lease, Right-of-Use Asset	69,065	0
Operating lease right-of-use assets	325,749	325,749
Goodwill	155,783	161,125
Other assets	52,784	89,438
Total non-current assets	1,032,691	1,001,063
Total assets	2,211,206	2,097,503
Current liabilities:
Accounts payable	138,727	119,485
Current portion of debt	11,250	5,625
Contract liabilities	12,815	15,125
Accrued insurance claims	44,035	39,961
Operating Lease, Liability, Current	25,072	0
Income taxes payable	366	721
Other accrued liabilities	109,390	104,074
Total current liabilities	341,655	284,991
Long-term debt	867,376	867,574
Accrued insurance claims	59,793	68,315
Operating Lease, Liability, Noncurrent	44,449	0
Deferred tax liabilities, net non-current	71,548	65,963
Other liabilities	5,208	6,492
Total liabilities	1,390,029	1,293,335
COMMITMENTS AND CONTINGENCIES, Note 20
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: 31,478,851 and 31,430,031 issued and outstanding, respectively	10,493	10,477
Additional paid-in capital	25,217	22,489
Accumulated other comprehensive loss	(1,296)	(1,282)
Retained earnings	786,763	772,484
Total stockholders’ equity	821,177	804,168
Total liabilities and stockholders’ equity	$ 2,211,206	$ 2,097,503

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Apr. 27, 2019	Jan. 26, 2019
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)	31,478,851	31,430,031
Common stock, shares outstanding	31,478,851	31,430,031

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Apr. 27, 2019	Apr. 28, 2018
REVENUES:
Contract revenues	$ 833,743	$ 731,375
EXPENSES:
Costs of earned revenues, excluding depreciation and amortization	701,767	599,573
General and administrative (including stock-based compensation expense of $3.5 million and $4.9 million, respectively)	58,622	62,283
Depreciation and amortization	46,341	43,355
Total	806,730	705,211
Interest expense, net	(12,233)	(10,166)
Other income, net	5,698	7,711
Income before income taxes	20,478	23,709
Provision (benefit) for income taxes:
Current	620	1,095
Deferred	5,579	5,383
Total provision for income taxes	6,199	6,478
Net income	$ 14,279	$ 17,231
Earnings per common share:
Basic earnings per common share (in dollars per share)	$ 0.45	$ 0.55
Diluted earnings per common share (in dollars per share)	$ 0.45	$ 0.53
Shares used in computing earnings per common share:
Basic (in shares)	31,451,809	31,190,366
Diluted (in shares)	31,786,459	32,407,914

CONSOLIDATED STATEMENTS OF OP_2

CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Apr. 27, 2019	Apr. 28, 2018
Income Statement [Abstract]
Stock-based compensation	$ 3,479	$ 4,863

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Apr. 27, 2019	Apr. 28, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 14,279	$ 17,231
Foreign currency translation losses, net of tax	(14)	(88)
Comprehensive income	$ 14,265	$ 17,143

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]
Beginning balance at Jan. 27, 2018	$ 724,996	$ 10,395	$ 6,170	$ (1,146)	$ 709,577
Beginning balance (shares) at Jan. 27, 2018		31,185,669
Increase (Decrease) in Stockholders' Equity
Stock options exercised	67	$ 2	65
Stock options exercised (shares)		5,084
Stock-based compensation	4,863	$ 1	4,862
Stock-based compensation (shares)		424
Issuance of restricted stock, net of tax withholdings	(87)	$ 0	(87)
Issuance of restricted stock, net of tax withholdings (shares)		1,892
Other comprehensive loss	(88)			(88)
Net income	17,231				17,231
Ending balance at Apr. 28, 2018	746,982	$ 10,398	11,010	(1,234)	726,808
Ending balance (shares) at Apr. 28, 2018		31,193,069
Beginning balance at Jan. 26, 2019	$ 804,168	$ 10,477	22,489	(1,282)	772,484
Beginning balance (shares) at Jan. 26, 2019	31,430,031	31,430,031
Increase (Decrease) in Stockholders' Equity
Stock options exercised	$ 106	$ 3	103
Stock options exercised (shares)		9,850
Stock-based compensation	3,479	$ 1	3,478
Stock-based compensation (shares)		1,528
Issuance of restricted stock, net of tax withholdings	(841)	$ 12	(853)
Issuance of restricted stock, net of tax withholdings (shares)		37,442
Other comprehensive loss	(14)			(14)
Net income	14,279				14,279
Ending balance at Apr. 27, 2019	$ 821,177	$ 10,493	$ 25,217	$ (1,296)	$ 786,763
Ending balance (shares) at Apr. 27, 2019	31,478,851	31,478,851

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 27, 2019	Apr. 28, 2018
OPERATING ACTIVITIES:
Net income	$ 14,279	$ 17,231
Adjustments to reconcile net income to net cash provided by operating activities, net of acquisitions:
Depreciation and amortization	46,341	43,355
Non-cash lease expense	7,390	0
Deferred income tax provision	5,579	5,383
Stock-based compensation	3,479	4,863
Provision for bad debt (recovery), net	(10,311)	(24)
Gain on sale of fixed assets	(6,738)	(8,415)
Amortization of debt discount	4,932	4,672
Amortization of debt issuance costs and other	985	887
Change in operating assets and liabilities:
Accounts receivable, net	(76,297)	(8,552)
Contract assets, net	(84,031)	(44,133)
Other current assets and inventories	(16,994)	(10,533)
Other assets	37,323	(212)
Income taxes receivable/payable	730	(568)
Accounts payable	18,300	13,169
Accrued liabilities, insurance claims, operating lease liabilities, and other liabilities	(1,089)	7,454
Net cash provided by operating activities	(56,122)	24,577
INVESTING ACTIVITIES:
Cash paid for acquisitions, net of cash acquired	0	(20,917)
Capital expenditures	(45,768)	(34,497)
Proceeds from sale of assets	7,362	8,011
Other investing activities	0	1,576
Net cash used in investing activities	(38,406)	(45,827)
FINANCING ACTIVITIES:
Principal payments on senior credit agreement, including term loans	0	(4,813)
Exercise of stock options	106	67
Restricted stock tax withholdings	(841)	(87)
Net cash used in financing activities	(735)	(4,833)
Net decrease in cash and equivalents and restricted cash	(95,263)	(26,083)
CASH AND EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD	134,151	90,182
CASH AND EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD	38,888	64,099
SUPPLEMENTAL DISCLOSURE OF OTHER CASH FLOW ACTIVITIES AND NON-CASH INVESTING AND FINANCING ACTIVITIES:
Cash paid for interest	7,474	5,415
Cash paid for taxes, net	814	2,322
Purchases of capital assets included in accounts payable or other accrued liabilities at period end	$ 8,054	6,769
0.75% Convertible Senior Notes Due 2021 [Member]
Debt Instrument, Interest Rate, Stated Percentage	0.75%
Adjustments to reconcile net income to net cash provided by operating activities, net of acquisitions:
Amortization of debt discount	$ 4,900	$ 4,700

Basis of Presentation (Notes)

Basis of Presentation (Notes)	3 Months Ended
	Apr. 27, 2019
Basis of Presentation [Abstract]
Basis of Accounting	1. Basis of Presentation Dycom Industries, Inc. (“Dycom” or the “Company”) is a leading provider of specialty contracting services throughout the United States. 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 U.S. 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 included in the Company’s Annual Report on Form 10-K for fiscal 2019 , filed with the SEC on March 4, 2019 . 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. Accounting Period. The Company’s fiscal year ends on the last Saturday in January and consists of either 52 or 53 weeks of operations (with the additional week of operations occurring in the fourth fiscal quarter). Fiscal 2019 and fiscal 2020 each consist of 52 weeks of operations. The next 53 week fiscal period will occur in the fiscal year ending January 30, 2021. 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), the results of which are regularly reviewed by the Company’s 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.

Significant Accounting Policies

Significant Accounting Policies and Estimates	3 Months Ended
	Apr. 27, 2019
Accounting Policies [Abstract]
Basis of Presentation and Accounting Policies	Significant Accounting Policies and 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 fiscal 2019 , except with respect to the Company’s accounting policy for leases as described further below. 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 Company’s consolidated financial position and results of operations taken as a whole. However, actual results could differ materially from those estimates. 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 fair value of the Company’s long-term debt, which is based on observable market-based inputs (Level 2). See Note 14, 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 April 27, 2019 and January 26, 2019 . During the three months ended April 27, 2019 and April 28, 2018 , the Company had no material nonrecurring fair value measurements of assets or liabilities subsequent to their initial recognition. Leases. The Company’s leases are accounted for as operating leases, with lease expense recognized on a straight-line basis over the lease term. The lease term may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. For leases with initial terms greater than 12 months, the Company records operating lease right-of-use assets and corresponding operating lease liabilities. Operating lease right-of-use assets represent the Company’s right to use the underlying asset for the lease term and operating lease liabilities represent the Company’s obligation to make the related lease payments. These assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As the Company’s leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. Leases with an initial term of 12 months or less are not recorded on the Company’s consolidated balance sheet.

Accounting Standards

Accounting Standards	3 Months Ended
	Apr. 27, 2019
Accounting Standards [Abstract]
New Accounting Pronouncements and Changes in Accounting Principles	3. Accounting Standards Recently issued accounting pronouncements are disclosed in the Company’s Annual Report on Form 10-K for fiscal 2019. As of the date of this Quarterly Report on Form 10-Q, 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 fiscal 2019. Further, there have been no additional accounting standards issued as of the date of this Quarterly Report on Form 10-Q that are applicable to the consolidated financial statements of the Company. Accounting standards adopted during the three months ended April 27, 2019 are disclosed in this Quarterly Report on Form 10‑Q. Recently Adopted Accounting Standards Leases . In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2016-02, Leases (Topic 842) (“ASU 2016-02”) which is intended to increase transparency and comparability of accounting for lease transactions. For all leases with terms greater than 12 months, the new guidance requires lessees to recognize right-of-use assets and corresponding lease liabilities on the balance sheet and to disclose qualitative and quantitative information about lease transactions. The new standard maintains a distinction between finance leases and operating leases. As a result, the effect of leases in the statement of operations and statement of cash flows is largely unchanged. Effective January 27, 2019, the first day of fiscal 2020, the Company adopted the requirements of ASU 2016-02 using the transition provisions at the date of adoption instead of at the earliest comparative period presented in the financial statements. Accordingly, comparative financial statements for periods prior to the date of adoption were not adjusted. The Company elected the group of practical expedients that allowed it not to reassess the following: whether any expired or existing contracts represent leases, the classification of any expired or existing leases, and the initial direct costs for any expired or existing leases. The Company did not elect the practical expedient to use hindsight to determine the lease term. On adoption, the Company recognized approximately $71.0 million of operating lease right-of-use assets and corresponding lease liabilities on its condensed consolidated balance sheet for its operating leases with terms greater than 12 months. The adoption of ASU 2016-02 did not have a material impact on the Company’s consolidated statements of operations, comprehensive income, or cash flows.

Computation of Earnings Per Com

Computation of Earnings Per Common Share	3 Months Ended
	Apr. 27, 2019
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 April 27, 2019 April 28, 2018 Net income available to common stockholders (numerator) $ 14,279 $ 17,231 Weighted-average number of common shares (denominator) 31,451,809 31,190,366 Basic earnings per common share $ 0.45 $ 0.55 Weighted-average number of common shares 31,451,809 31,190,366 Potential shares of common stock arising from stock options, and unvested restricted share units 334,650 602,549 Potential shares of common stock issuable on conversion of 0.75% convertible senior notes due 2021 (1) — 614,999 Total shares-diluted (denominator) 31,786,459 32,407,914 Diluted earnings per common share $ 0.45 $ 0.53 Anti-dilutive weighted shares excluded from the calculation of earnings per common share: Stock-based awards 266,371 80,847 0.75% convertible senior notes due 2021 5,005,734 4,390,735 Warrants 5,005,734 5,005,734 Total 10,277,839 9,477,316 (1) 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 $96.89 per share conversion price for the convertible senior notes. The warrants associated with the Company’s 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 $130.43 per share warrant strike price. During the three months ended April 28, 2018 , the Company’s average stock price of $110.46 exceeded the conversion price for the convertible senior notes. As a result, shares presumed to be issuable under the convertible senior notes that were dilutive during the period are included in the calculation of diluted earnings per share for the three months ended April 28, 2018 . As the Company’s average stock price did not exceed 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 14, Debt , for additional information related to the Company’s convertible senior notes, warrant transactions, and hedge transactions.

Acquisitions

Acquisitions	3 Months Ended
	Apr. 27, 2019
Business Combinations [Abstract]
Acquisitions	Acquisitions During March 2018, the Company acquired certain assets and assumed certain liabilities of a provider of telecommunications construction and maintenance services in the Midwest and Northeast United States for a cash purchase price of $20.9 million , less an adjustment for working capital received below a target amount of approximately $0.5 million expected to be received during fiscal 2020. This acquisition expands the Company’s geographic presence within its existing customer base. The purchase price allocation of the business acquired in fiscal 2019 was completed within the 12-month measurement period from the date of acquisition. Adjustments to provisional amounts were recognized in the reporting period in which the adjustments were determined and were not material. The following table summarizes the aggregate consideration paid for the fiscal 2019 acquisition (dollars in millions): 2019 Assets Accounts receivable $ 5.6 Inventories and other current assets 0.2 Property and equipment 0.5 Goodwill 4.0 Intangible assets - customer relationships 12.3 Total assets 22.6 Liabilities Accounts payable 2.2 Total liabilities 2.2 Net Assets Acquired $ 20.4 Results of the business acquired in fiscal 2019 are included in the condensed consolidated financial statements from the date of acquisition. Contract revenues and net income of this acquisition were not material during the three months ended April 27, 2019 or April 28, 2018 .

Accounts Receivable

Accounts Receivable	3 Months Ended
	Apr. 27, 2019
Receivables [Abstract]
Accounts Receivable	Accounts Receivable, Contract Assets, and Contract Liabilities The following provides further details on the balance sheet accounts of accounts receivable, net, contract assets, and contract liabilities. Accounts Receivable Accounts receivable, net classified as current consisted of the following (dollars in thousands): April 27, 2019 January 26, 2019 Trade accounts receivable $ 299,572 $ 331,903 Unbilled accounts receivable 393,198 283,463 Retainage 10,124 10,831 Total 702,894 626,197 Less: allowance for doubtful accounts (1,372 ) (939 ) Accounts receivable, net $ 701,522 $ 625,258 The Company maintains an allowance for doubtful accounts for estimated losses on uncollected balances. Approximately $16.8 million of the allowance for doubtful accounts as of January 26, 2019 was classified as non-current. During the three months ended April 27, 2019, the Company recognized a $10.3 million recovery of previously reserved accounts receivable and contract assets based on collections from a customer. The allowance for doubtful accounts changed as follows (dollars in thousands): For the Three Months Ended April 27, 2019 April 28, 2018 Allowance for doubtful accounts at beginning of period $ 17,702 $ 998 Provision for bad debt (recovery) (10,311 ) (24 ) Amounts (charged) recovered against the allowance (6,019 ) 2 Allowance for doubtful accounts at end of period $ 1,372 $ 976 Contract Assets and Contract Liabilities Net contract assets consisted of the following (dollars in thousands): April 27, 2019 January 26, 2019 Contract assets $ 297,630 $ 215,849 Contract liabilities 12,815 15,125 Contract assets, net $ 284,815 $ 200,724 Net contract assets were $284.8 million and $200.7 million as of April 27, 2019 and January 26, 2019 , respectively. The increase primarily resulted from services performed under contracts consisting of multiple tasks, for which billings will be submitted upon completion of those tasks not yet completed. There were no other significant changes in contract assets during the period. During the three months ended April 27, 2019 , the Company performed services and recognized $8.0 million of contract revenues related to its contract liabilities that existed at January 26, 2019 . See Note 7, Other Current Assets and Other Assets , for information on the Company’s long-term contract assets. Customer Credit Concentration Customers whose combined amounts of trade accounts receivable and contract assets, net exceeded 10% of total combined accounts receivable and contract assets, net as of April 27, 2019 or January 26, 2019 were as follows (dollars in millions): April 27, 2019 January 26, 2019 Amount % of Total Amount % of Total Verizon Communications Inc. $ 390.3 39.6% $ 298.4 36.2% CenturyLink, Inc. $ 152.7 15.5% $ 147.2 17.9% Comcast Corporation $ 131.1 13.3% $ 127.2 15.4% AT&T Inc. $ 114.3 11.6% $ 90.6 11.0% The Company believes that none of the customers above were experiencing financial difficulties that would materially impact the collectability of the Company’s total accounts receivable and contract assets, net as of April 27, 2019 or January 26, 2019 .

Other Current Assets and Other

Other Current Assets and Other Assets	3 Months Ended
	Apr. 27, 2019
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): April 27, 2019 January 26, 2019 Prepaid expenses $ 20,045 $ 12,758 Deposits and other current assets 14,137 14,762 Insurance recoveries/receivables for accrued insurance claims 2,100 — Restricted cash 1,556 1,556 Receivables on equipment sales 404 69 Total other current assets $ 38,242 $ 29,145 Other assets (long-term) consisted of the following (dollars in thousands): April 27, 2019 January 26, 2019 Long-term contract assets $ 28,368 $ 30,399 Deferred financing costs 8,534 9,036 Restricted cash 3,753 4,253 Insurance recoveries/receivables for accrued insurance claims 5,007 13,684 Long-term accounts receivable, net — 24,815 Other non-current deposits and assets 7,122 7,251 Total other assets $ 52,784 $ 89,438 Insurance recoveries/receivables represent the amount of accrued insurance claims that are covered by insurance as the amounts exceed the Company’s loss retention. During the three months ended April 27, 2019 , total insurance recoveries/receivables decreased approximately $6.6 million primarily due to the settlement of claims. Long-term contract assets represent payments made to customers pursuant to long-term agreements and are recognized as a reduction of contract revenues over the period for which the related services are provided to the customers. Long-term accounts receivable, net of allowance for doubtful accounts, represent trade receivables due from Windstream Holdings, Inc. as of January 26, 2019 . During the quarter ended April 27, 2019 the Company collected a substantial portion of these accounts receivable. Amounts remaining to be collected are included in current accounts receivable, net as of April 27, 2019 . See Note 6, Accounts Receivable, Contract Assets, and Contract Liabilities , for information on the Company’s current accounts receivable, net and contract assets as of April 27, 2019 .

Cash and Equivalents and Restri

Cash and Equivalents and Restricted Cash	3 Months Ended
	Apr. 27, 2019
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents Disclosure [Text Block]	8. Cash and Equivalents and Restricted Cash Amounts of cash and equivalents and restricted cash reported in the condensed consolidated statement of cash flows consisted of the following (dollars in thousands): April 27, 2019 January 26, 2019 Cash and equivalents $ 33,579 $ 128,342 Restricted cash included in: Other current assets 1,556 1,556 Other assets (long-term) 3,753 4,253 Total cash and equivalents and restricted cash $ 38,888 $ 134,151

Property and Equipment

Property and Equipment	3 Months Ended
	Apr. 27, 2019
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) April 27, 2019 January 26, 2019 Land — $ 4,024 $ 4,359 Buildings 10-35 12,725 13,555 Leasehold improvements 1-10 16,694 16,185 Vehicles 1-5 606,576 589,741 Computer hardware and software 1-7 145,124 140,327 Office furniture and equipment 1-10 13,189 12,804 Equipment and machinery 1-10 302,708 296,408 Total 1,101,040 1,073,379 Less: accumulated depreciation (671,730 ) (648,628 ) Property and equipment, net $ 429,310 $ 424,751 Depreciation expense was $41.0 million and $37.7 million for the three months ended April 27, 2019 and April 28, 2018 , respectively.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	3 Months Ended
	Apr. 27, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill There were no changes in the carrying amount of goodwill during the three months ended April 27, 2019 . The goodwill balance consisted of the following (dollars in thousands): April 27, 2019 Goodwill, gross $ 521,516 Accumulated impairment losses (195,767 ) Total $ 325,749 The Company’s goodwill resides in multiple reporting units and primarily consists of expected synergies, together with the expansion of the Company’s geographic presence and strengthening of its customer base from acquisitions. 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, increased costs of providing services, and the level of overall economic activity. The Company’s customers may reduce capital expenditures and defer or cancel pending projects due to changes in technology, a slowing or uncertain economy, merger or acquisition activity, a decision to allocate resources to other areas of their business, or other reasons. The profitability of reporting units may also suffer if actual costs of providing services exceed the costs anticipated when the Company enters into contracts. 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 performs its annual goodwill assessment as of the first day of the fourth fiscal quarter of each fiscal year. As a result of the Company’s fiscal 2019 period assessment, the Company determined that the fair values of each of the reporting units and the indefinite-lived intangible asset were in excess of their carrying values and no impairment had occurred. As of April 27, 2019 , the Company continues to believe the goodwill and the indefinite-lived intangible asset are recoverable for all of its reporting units. Intangible Assets The Company’s intangible assets consisted of the following (dollars in thousands): April 27, 2019 January 26, 2019 Weighted Average Remaining Useful Lives (Years) Gross Carrying Amount Accumulated Amortization Intangible Assets, Net Gross Carrying Amount Accumulated Amortization Intangible Assets, Net Customer relationships 10.8 $ 312,017 $ 162,918 $ 149,099 $ 312,017 $ 157,691 $ 154,326 Trade names, finite 8.0 10,350 8,417 1,933 10,350 8,312 2,038 Trade name, indefinite — 4,700 — 4,700 4,700 — 4,700 Non-compete agreements 1.3 200 149 51 200 139 61 $ 327,267 $ 171,484 $ 155,783 $ 327,267 $ 166,142 $ 161,125 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 $5.3 million and $5.7 million for the three months ended April 27, 2019 and April 28, 2018 , respectively. As of April 27, 2019 , 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.

Accrued Insurance Claims

Accrued Insurance Claims	3 Months Ended
	Apr. 27, 2019
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 in January 2020, 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 $77.1 million for the twelve month policy period ending in January 2020. The Company is party to a stop-loss agreement for losses under its employee group health plan. For calendar year 2019, 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 for all participants of $425,000 . Amounts for total accrued insurance claims and insurance recoveries/receivables are as follows (dollars in thousands): April 27, 2019 January 26, 2019 Accrued insurance claims - current $ 44,035 $ 39,961 Accrued insurance claims - non-current 59,793 68,315 Total accrued insurance claims $ 103,828 $ 108,276 Insurance recoveries/receivables: Current (included in Other current assets) $ 2,100 $ — Non-current (included in Other assets) 5,007 13,684 Total insurance recoveries/receivables $ 7,107 $ 13,684 Insurance recoveries/receivables represent the amount of accrued insurance claims that are covered by insurance as the amounts exceed the Company’s loss retention. During the three months ended April 27, 2019 , total insurance recoveries/receivables decreased approximately $6.6 million primarily due to the settlement of claims. Accrued insurance claims decreased by a corresponding amount.

Leases (Notes)

Leases (Notes)	3 Months Ended
	Apr. 27, 2019
Leases [Abstract]
Leases	Leases The Company leases the majority of its office facilities as well as certain equipment, all of which are accounted for as operating leases. These leases have remaining terms ranging from less than 1 year to approximately 6 years. Some leases include options to extend the lease for up to 5 years and others include options to terminate. The following table summarizes the components of lease cost recognized in the condensed consolidated statements of operations for the three months ended April 27, 2019 (dollars in thousands): For the Three Months Ended April 27, 2019 Lease cost under long-term operating leases $ 8,331 Lease cost under short-term operating leases 8,406 Variable lease cost under short-term and long-term operating leases (1) 1,210 Total lease cost $ 17,947 (1) Variable lease expense primarily includes insurance, maintenance, and other operating expenses related to the Company’s leased office facilities. The Company’s operating lease liabilities related to long-term operating leases were $69.5 million as of April 27, 2019 . Supplemental balance sheet information related to these liabilities is as follows (dollars in thousands): April 27, 2019 Weighted average remaining lease term 3.4 years Weighted average discount rate 5.3 % Supplemental cash flow information related to the Company’s long-term operating lease liabilities as of April 27, 2019 is as follows (dollars in thousands): For the Three Months Ended April 27, 2019 Cash paid for amounts included in the measurement of lease liabilities: $ 8,189 Operating lease right-of-use assets obtained in exchange for operating lease liabilities: $ 5,513 As of April 27, 2019 , maturities of the Company’s lease liabilities under its long-term operating leases for the next five fiscal years and thereafter are as follows (dollars in thousands): Fiscal Year Amount Remainder of 2020 $ 21,954 2021 23,394 2022 15,382 2023 7,678 2024 4,885 Thereafter 4,132 Total lease payments 77,425 Less: imputed interest (7,904 ) Total $ 69,521 As of April 27, 2019 , the Company had additional operating leases that have not yet commenced of $2.2 million . These leases will commence during the second quarter of fiscal 2020. As of January 26, 2019 , the future minimum obligation by fiscal year for the Company’s operating leases with original noncancelable terms in excess of one year was as follows (dollars in thousands): Fiscal Year Amount 2020 $ 28,415 2021 20,166 2022 12,919 2023 6,686 2024 4,342 Thereafter 3,675 Total $ 76,203 See Note 2, Significant Accounting Policies and Estimates , for further information on the Company’s accounting policy for leases and Note 3, Accounting Standards , for further information on the Company’s adoption of ASU 2016-02.

Other Accrued Liabilities

Other Accrued Liabilities	3 Months Ended
	Apr. 27, 2019
Payables and Accruals [Abstract]
Other Accrued Liabilities	Other Accrued Liabilities Other accrued liabilities consisted of the following (dollars in thousands): April 27, 2019 January 26, 2019 Accrued payroll and related taxes $ 28,420 $ 25,591 Accrued employee benefit and incentive plan costs 9,475 25,482 Accrued construction costs 51,439 36,449 Other current liabilities 20,056 16,552 Total other accrued liabilities $ 109,390 $ 104,074 During the three months ended April 27, 2019 , accrued construction costs increased approximately $15.0 million primarily due to an $8.2 million charge for estimated warranty costs for work performed for a customer in prior periods.

Debt

Debt	3 Months Ended
	Apr. 27, 2019
Debt Disclosure [Abstract]
Debt	Debt The Company’s outstanding indebtedness consisted of the following (dollars in thousands): April 27, 2019 January 26, 2019 Credit Agreement - Revolving facility (matures October 2023) $ — $ — Credit Agreement - Term loan facility (matures October 2023) 450,000 450,000 0.75% convertible senior notes, net (mature September 2021) 428,626 423,199 878,626 873,199 Less: current portion (11,250 ) (5,625 ) Long-term debt $ 867,376 $ 867,574 Senior Credit Agreement On October 19, 2018 , the Company and certain of its subsidiaries amended and restated its existing credit agreement, dated as of December 3, 2012 , as amended on April 24, 2015 and as subsequently amended and supplemented, with the various lenders party thereto (the “Credit Agreement”). The maturity date of the Credit Agreement was extended to October 19, 2023 and, among other things, the maximum revolver commitment was increased to $750.0 million from $450.0 million and the term loan facility was increased to $450.0 million . The Credit Agreement includes a $200.0 million sublimit 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) $350.0 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 net leverage ratio does not exceed 2.25 to 1.00. The consolidated senior secured net leverage ratio is the ratio of the Company’s consolidated senior secured indebtedness reduced by unrestricted cash and equivalents in excess of $50.0 million to its trailing twelve-month consolidated earnings before interest, taxes, depreciation, and amortization, as defined by the Credit Agreement (“EBITDA”). 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. Under the Credit Agreement, borrowings bear interest at the rates described below based upon the Company’s consolidated net leverage ratio, which is the ratio of the Company’s consolidated total funded debt reduced by unrestricted cash and equivalents in excess of $50.0 million 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 net 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 0.20% - 0.40% Standby Letters of Credit 1.25% - 2.00% Commercial Letters of Credit 0.625% - 1.00% (1) The administrative agent’s base rate is described in the Credit Agreement as the highest of (i) the Federal Funds Rate plus 0.50% , (ii) the administrative agent’s prime rate, and (iii) the Eurodollar rate plus 1.00% . Standby letters of credit of approximately $52.3 million and $48.6 million , issued as part of the Company’s insurance program, were outstanding under the Credit Agreement as of April 27, 2019 and January 26, 2019 , respectively. The weighted average interest rates and fees for balances under the Credit Agreement as of April 27, 2019 and January 26, 2019 were as follows: Weighted Average Rate End of Period April 27, 2019 January 26, 2019 Borrowings - Term loan facilities 4.24% 4.25% 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 April 27, 2019 or January 26, 2019 . The Credit Agreement contains a financial covenant that requires the Company to maintain a consolidated net leverage ratio of not greater than 3.50 to 1.00 , as measured at the end of each fiscal quarter, and provides for certain increases to this ratio in connection with permitted acquisitions. The agreement also 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, each as defined by the Credit Agreement, of not less than 3.00 to 1.00 , as measured at the end of each fiscal quarter. In addition, the Credit Agreement contains a minimum liquidity covenant. This covenant becomes effective beginning 91 days prior to the maturity date of the Company’s 0.75% convertible senior notes due September 2021 (the “Notes”) if the outstanding principal amount of the Notes is greater than $250.0 million . In such event, the Company would be required to maintain liquidity, as defined by the Credit Agreement, equal to $150.0 million in excess of the outstanding principal amount of the Notes. This covenant terminates at the earliest date of when the outstanding principal amount of the Notes is reduced to $250.0 million or less, the Notes are amended pursuant to terms that extend the maturity date to 91 or more days beyond the maturity date of the Credit Agreement, or the Notes are refinanced pursuant to terms that extend the maturity date to 91 or more days beyond the maturity date of the Credit Agreement. At April 27, 2019 and January 26, 2019 , the Company was in compliance with the financial covenants of the Credit Agreement and had borrowing availability under the revolving facility of $325.4 million and $412.9 million , respectively, 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 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 ( $125.96 assuming an applicable conversion price of $96.89 ); (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. During the three months ended April 27, 2019 , the closing price of the Company’s common stock did not meet or exceed 130% of the applicable conversion price of the Notes for at least 20 of the last 30 consecutive trading dates of the quarter. Additionally, no other conditions allowing holders of the Notes to convert have been met as of April 27, 2019 . As a result, the Notes were not convertible during the three months ended April 27, 2019 and are classified as long-term debt. 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 $4.9 million and $4.7 million of interest expense during the three months ended April 27, 2019 and April 28, 2018 , respectively, for the non-cash amortization of the debt discount. The liability component of the Notes consisted of the following (dollars in thousands): April 27, 2019 January 26, 2019 Liability component Principal amount of 0.75% convertible senior notes due September 2021 $ 485,000 $ 485,000 Less: Debt discount (50,863 ) (55,795 ) Less: Debt issuance costs (5,511 ) (6,006 ) Net carrying amount of Notes $ 428,626 $ 423,199 The equity component of the Notes was recognized at issuance and represents the difference between the principal amount of the Notes and the fair value of the liability component of the Notes at issuance. 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 following table summarizes the fair value of the Notes, net of the debt discount and debt issuance costs. The fair value of the Notes is based on the closing trading price per $100 of the Notes as of the last day of trading for the respective periods (Level 2), which was $95.50 and $96.31 as of April 27, 2019 and January 26, 2019 , respectively (dollars in thousands): April 27, 2019 January 26, 2019 Fair value of principal amount of Notes $ 463,175 $ 467,104 Less: Debt discount and debt issuance costs (56,374 ) (61,801 ) Fair value of Notes $ 406,801 $ 405,303 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 governing the Notes, 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 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 condensed consolidated balance sheets. See Note 15, Income Taxes , for additional information regarding the Company’s deferred tax liabilities and assets.

Income Taxes

Income Taxes	3 Months Ended
	Apr. 27, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s interim income tax provisions are based on the effective income tax rate expected to be applicable for the full fiscal year, adjusted for specific items that are required to be recognized in the period in which they occur. Deferred tax assets and liabilities are based on the enacted tax rate that will apply in future periods when such assets and liabilities are expected to be settled or realized. The Company’s effective income tax rate of 30.3% and 27.3% for the three months ended April 27, 2019 and April 28, 2018 , respectively, 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 certain tax impacts from the vesting and exercise of share-based awards.

Other Income, Net

Other Income, Net	3 Months Ended
	Apr. 27, 2019
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 April 27, 2019 April 28, 2018 Gain on sale of fixed assets $ 6,738 $ 8,415 Discount fee expense (1,298 ) (940 ) Miscellaneous income, net 258 236 Total other income, net $ 5,698 $ 7,711 The Company participates in a vendor payment program sponsored by one of its customers. Eligible accounts receivable from this customer are included in the program and payment is received pursuant to a non-recourse sale to a 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 discount fee expense in the table above and is included as an expense component in other income, net, in the condensed consolidated statements of operations.

Capital Stock

Capital Stock	3 Months Ended
	Apr. 27, 2019
Stockholders' Equity Note [Abstract]
Capital Stock	Capital Stock Repurchases of Common Stock. On August 29, 2018, the Company announced that its Board of Directors had authorized a $150.0 million program to repurchase shares of the Company’s outstanding common stock through February 2020 in open market or private transactions. As of April 27, 2019 , $150.0 million of the repurchase authorization remained available. The Company did not repurchase any of its common stock during the three months ended April 27, 2019 and April 28, 2018 .

Stock-Based Awards

Stock-Based Awards	3 Months Ended
	Apr. 27, 2019
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, time-based restricted share units (“RSUs”), and performance-based restricted share units (“Performance RSUs”) to attract, retain, and reward talented employees, officers, and directors, and to align their interests with those of its stockholders. Compensation expense for stock-based awards is based on fair value at the measurement date. This expense 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. Stock-based compensation 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 operating earnings (adjusted for certain amounts) as a percentage of contract revenues for the applicable four-quarter period (a “Performance Year”) and its Performance Year operating cash flow level (adjusted for certain amounts). Additionally, certain awards include three-year performance measures 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 during the three months ended April 27, 2019 and April 28, 2018 were as follows (dollars in thousands): For the Three Months Ended April 27, 2019 April 28, 2018 Stock-based compensation $ 3,479 $ 4,863 Income tax effect of stock-based compensation $ 869 $ 1,069 In addition, the Company realized approximately $0.6 million of net tax deficiencies and $0.1 million of excess tax benefits during the three months ended April 27, 2019 and April 28, 2018 , respectively, related to the vesting and exercise of share-based awards. As of April 27, 2019 , the Company had unrecognized compensation expense related to stock options, RSUs, and target Performance RSUs (based on the Company’s expected achievement of performance measures) of $3.1 million , $11.8 million , and $21.6 million , respectively. This expense will be recognized over a weighted-average number of years of 2.6 , 2.7 , and 2.1 , respectively, based on the average remaining service periods for the awards. As of April 27, 2019 , the Company may recognize an additional $24.5 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 April 27, 2019 : Stock Options Shares Weighted Average Exercise Price Outstanding as of January 26, 2019 583,291 $ 34.24 Granted 39,276 $ 45.94 Options exercised (9,850 ) $ 10.71 Canceled — $ — Outstanding as of April 27, 2019 612,717 $ 35.37 Exercisable options as of April 27, 2019 510,220 $ 27.86 RSUs and Performance RSUs The following table summarizes RSU and Performance RSU award activity during the three months ended April 27, 2019 : Restricted Stock RSUs Performance RSUs Share Units Weighted Average Grant Date Fair Value Share Units Weighted Average Grant Date Fair Value Outstanding as of January 26, 2019 126,470 $ 87.92 377,354 $ 96.51 Granted 89,863 $ 46.18 475,629 $ 45.94 Share units vested (13,356 ) $ 95.27 (43,900 ) $ 93.49 Forfeited or canceled (123 ) $ 81.85 (29,002 ) $ 103.15 Outstanding as of April 27, 2019 202,854 $ 68.95 780,081 $ 65.60 The total amount of granted Performance RSUs presented above consists of 333,567 target shares and 142,062 supplemental shares. The total amount of Performance RSUs outstanding as of April 27, 2019 consists of 552,904 target shares and 227,177 supplemental shares. With respect to the Company’s Performance Year ended January 26, 2019, the Company canceled 12,331 target shares and 13,556 supplemental shares as a result of the performance period criteria being partially met.

Concentration of Credit Risk

Concentration of Credit Risk	3 Months Ended
	Apr. 27, 2019
Risks and Uncertainties [Abstract]
Concentration of Credit Risk	Customer Concentration and Revenue Information Geographic Location The Company provides services throughout the United States. Contract revenues from services previously provided in Canada were not material during the three months ended April 28, 2018 . Significant Customers The Company’s customer base is highly concentrated, with its top five customers accounting for approximately 80.4% and 78.8% , respectively, of its total contract revenues during the three months ended April 27, 2019 and April 28, 2018 , respectively. Customers whose contract revenues exceeded 10% of total contract revenues during the three months ended April 27, 2019 or April 28, 2018 , as well as total contract revenues from all other customers combined, were as follows (dollars in millions): For the Three Months Ended April 27, 2019 April 28, 2018 Amount % of Total Amount % of Total AT&T Inc. $ 209.3 25.1% $ 177.0 24.2% Verizon Communications Inc. 179.8 21.6 122.1 16.7 Comcast Corporation 137.1 16.4 159.2 21.8 CenturyLink, Inc. 109.8 13.2 89.7 12.3 Total other customers combined 197.7 23.7 183.4 25.0 Total contract revenues $ 833.7 100.0% $ 731.4 100.0% See Note 6, Accounts Receivable, Contract Assets, and Contract Liabilities , for information on the Company’s customer credit concentration and collectability of trade accounts receivable and contract assets. Customer Type Total contract revenues by customer type during the three months ended April 27, 2019 and April 28, 2018 were as follows (dollars in millions): For the Three Months Ended April 27, 2019 April 28, 2018 Amount % of Total Amount % of Total Telecommunications $ 761.4 91.3% $ 667.2 91.2% Underground facility locating 48.2 5.8 45.1 6.2 Electrical and gas utilities and other 24.1 2.9 19.1 2.6 Total contract revenues $ 833.7 100.0% $ 731.4 100.0% Remaining Performance Obligations Master service agreements and other contractual agreements with customers contain customer-specified service requirements, such as discrete pricing for individual tasks. In most cases, the Company’s customers are not contractually committed to procure specific volumes of services under these agreements. Services are generally performed pursuant to these agreements in accordance with individual work orders. An individual work order generally is completed within one year. As a result, the Company’s remaining performance obligations under the work orders not yet completed is not meaningful in relation to the Company’s overall revenue at any given point in time. The Company applies the practical expedient in Accounting Standards Codification Topic 606, Revenue from Contracts with Customers, and does not disclose information about remaining performance obligations that have original expected durations of one year or less.

Commitment and Contingencies

Commitment and Contingencies	3 Months Ended
	Apr. 27, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies On October 25, 2018 and October 30, 2018, the Company, its Chief Executive Officer and its Chief Financial Officer were named as defendants in two substantively identical lawsuits alleging violations of the federal securities fraud laws. The lawsuits, which purport to be brought on behalf of a class of all purchasers of the Company’s securities between November 20, 2017 and August 10, 2018, were filed in the United States District Court for the Southern District of Florida. The cases were consolidated by the Court on January 11, 2019. The lawsuit alleges that the defendants made materially false and misleading statements or failed to disclose material facts regarding the Company’s financial condition and business operations, including those related to the Company’s dependency on, and uncertainties related to, the permitting necessary for its large projects. The plaintiffs seek unspecified damages. The Company believes the allegations in the lawsuit are without merit and intends to vigorously defend the lawsuit. Based on the early stage of this matter, it is not possible to estimate the amount or range of possible loss that may result from an adverse judgment or a settlement of this matter. On December 17, 2018, a shareholder derivative action was filed in United States District Court for the Southern District of Florida against the Company, as nominal defendant, and the members of its Board of Directors, alleging that the directors breached fiduciary duties owed to the Company and violated the securities laws by causing the Company to issue false and misleading statements. The statements alleged to be false and misleading are the same statements that are alleged to be false and misleading in the securities lawsuit described above. On February 28, 2019, the Court stayed this lawsuit pending a further Order from the Court. Based on the early stage of this matter, it is not possible to estimate the amount or range of possible loss that may result from an adverse judgment or a settlement of this matter. 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 (“ERISA”) 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 during calendar year 2019. 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 payments of a withdrawal liability to the Plan in the amount of approximately $0.1 million per month. If the Company prevails in disputing the withdrawal liability, all such payments will be refunded to the subsidiary. From time to time, the Company is party to various claims and legal proceedings arising in the ordinary course of business. While the resolution of these matters cannot be predicted with certainty, it is the opinion of management, based on information available at this time, that the ultimate resolution of any such claims or legal proceedings will not, after considering applicable insurance coverage or other indemnities to which the Company may be entitled, have a material effect on the Company’s financial position, results of operations, or cash flow. 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 and Payment 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 April 27, 2019 and January 26, 2019 , the Company had $142.8 million and $123.5 million , respectively, of outstanding performance and other surety contract bonds. In addition to performance and other surety contract bonds, as part of its insurance program the Company also provides surety bonds that collateralize its obligations to its insurance carriers. As of April 27, 2019 and January 26, 2019 , the Company had $23.4 million and $23.2 million , respectively, of outstanding surety bonds related to its insurance obligations. Additionally, 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 issued standby letters of credit under its Credit Agreement that collateralize its obligations to its insurance carriers. As of April 27, 2019 and January 26, 2019 , the Company had $52.3 million and $48.6 million , respectively, of outstanding standby letters of credit issued under the Credit Agreement.

Basis of Presentation (Policies

Basis of Presentation (Policies)	3 Months Ended
	Apr. 27, 2019
Basis of Presentation [Abstract]
Basis of Presentation	Dycom Industries, Inc. (“Dycom” or the “Company”) is a leading provider of specialty contracting services throughout the United States. 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 U.S. 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 included in the Company’s Annual Report on Form 10-K for fiscal 2019 , filed with the SEC on March 4, 2019 . 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.
Accounting Period	Accounting Period. The Company’s fiscal year ends on the last Saturday in January and consists of either 52 or 53 weeks of operations (with the additional week of operations occurring in the fourth fiscal quarter). Fiscal 2019 and fiscal 2020 each consist of 52 weeks of operations. The next 53 week fiscal period will occur in the fiscal year ending January 30, 2021.
Segment Reporting Disclosure	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), the results of which are regularly reviewed by the Company’s 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.

Significant Accounting Polici_2

Significant Accounting Policies and Estimates (Policies)	3 Months Ended
	Apr. 27, 2019
Accounting Policies [Abstract]
Lessee, Leases [Policy Text Block]	Leases. The Company’s leases are accounted for as operating leases, with lease expense recognized on a straight-line basis over the lease term. The lease term may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. For leases with initial terms greater than 12 months, the Company records operating lease right-of-use assets and corresponding operating lease liabilities. Operating lease right-of-use assets represent the Company’s right to use the underlying asset for the lease term and operating lease liabilities represent the Company’s obligation to make the related lease payments. These assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As the Company’s leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. Leases with an initial term of 12 months or less are not recorded on the Company’s consolidated balance sheet.
Basis of Presentation	Dycom Industries, Inc. (“Dycom” or the “Company”) is a leading provider of specialty contracting services throughout the United States. 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 U.S. 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 included in the Company’s Annual Report on Form 10-K for fiscal 2019 , filed with the SEC on March 4, 2019 . 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.
Accounting Period	Accounting Period. The Company’s fiscal year ends on the last Saturday in January and consists of either 52 or 53 weeks of operations (with the additional week of operations occurring in the fourth fiscal quarter). Fiscal 2019 and fiscal 2020 each consist of 52 weeks of operations. The next 53 week fiscal period will occur in the fiscal year ending January 30, 2021.
Use of Estimates	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 Company’s consolidated financial position and results of operations taken as a whole. However, actual results could differ materially from those estimates.
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 fair value of the Company’s long-term debt, which is based on observable market-based inputs (Level 2). See Note 14, 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 April 27, 2019 and January 26, 2019 . During the three months ended April 27, 2019 and April 28, 2018 , 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 Leases . In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2016-02, Leases (Topic 842) (“ASU 2016-02”) which is intended to increase transparency and comparability of accounting for lease transactions. For all leases with terms greater than 12 months, the new guidance requires lessees to recognize right-of-use assets and corresponding lease liabilities on the balance sheet and to disclose qualitative and quantitative information about lease transactions. The new standard maintains a distinction between finance leases and operating leases. As a result, the effect of leases in the statement of operations and statement of cash flows is largely unchanged. Effective January 27, 2019, the first day of fiscal 2020, the Company adopted the requirements of ASU 2016-02 using the transition provisions at the date of adoption instead of at the earliest comparative period presented in the financial statements. Accordingly, comparative financial statements for periods prior to the date of adoption were not adjusted. The Company elected the group of practical expedients that allowed it not to reassess the following: whether any expired or existing contracts represent leases, the classification of any expired or existing leases, and the initial direct costs for any expired or existing leases. The Company did not elect the practical expedient to use hindsight to determine the lease term. On adoption, the Company recognized approximately $71.0 million of operating lease right-of-use assets and corresponding lease liabilities on its condensed consolidated balance sheet for its operating leases with terms greater than 12 months. The adoption of ASU 2016-02 did not have a material impact on the Company’s consolidated statements of operations, comprehensive income, or cash flows.

Computation of Earnings Per C_2

Computation of Earnings Per Common Share (Tables)	3 Months Ended
	Apr. 27, 2019
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 April 27, 2019 April 28, 2018 Net income available to common stockholders (numerator) $ 14,279 $ 17,231 Weighted-average number of common shares (denominator) 31,451,809 31,190,366 Basic earnings per common share $ 0.45 $ 0.55 Weighted-average number of common shares 31,451,809 31,190,366 Potential shares of common stock arising from stock options, and unvested restricted share units 334,650 602,549 Potential shares of common stock issuable on conversion of 0.75% convertible senior notes due 2021 (1) — 614,999 Total shares-diluted (denominator) 31,786,459 32,407,914 Diluted earnings per common share $ 0.45 $ 0.53 Anti-dilutive weighted shares excluded from the calculation of earnings per common share: Stock-based awards 266,371 80,847 0.75% convertible senior notes due 2021 5,005,734 4,390,735 Warrants 5,005,734 5,005,734 Total 10,277,839 9,477,316 (1) 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 $96.89 per share conversion price for the convertible senior notes. The warrants associated with the Company’s 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 $130.43 per share warrant strike price. During the three months ended April 28, 2018 , the Company’s average stock price of $110.46 exceeded the conversion price for the convertible senior notes. As a result, shares presumed to be issuable under the convertible senior notes that were dilutive during the period are included in the calculation of diluted earnings per share for the three months ended April 28, 2018 . As the Company’s average stock price did not exceed the strike price for the warrants, the underlying common shares were anti-dilutive as reflected in the table above.

Acquisitions (Tables)

Acquisitions (Tables)	3 Months Ended
	Apr. 27, 2019
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following table summarizes the aggregate consideration paid for the fiscal 2019 acquisition (dollars in millions): 2019 Assets Accounts receivable $ 5.6 Inventories and other current assets 0.2 Property and equipment 0.5 Goodwill 4.0 Intangible assets - customer relationships 12.3 Total assets 22.6 Liabilities Accounts payable 2.2 Total liabilities 2.2 Net Assets Acquired $ 20.4

Accounts Receivable (Tables)

Accounts Receivable (Tables)	3 Months Ended
	Apr. 27, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Schedule of Accounts Receivable	The Company maintains an allowance for doubtful accounts for estimated losses on uncollected balances. Approximately $16.8 million of the allowance for doubtful accounts as of January 26, 2019 was classified as non-current. During the three months ended April 27, 2019, the Company recognized a $10.3 million recovery of previously reserved accounts receivable and contract assets based on collections from a customer. The allowance for doubtful accounts changed as follows (dollars in thousands): For the Three Months Ended April 27, 2019 April 28, 2018 Allowance for doubtful accounts at beginning of period $ 17,702 $ 998 Provision for bad debt (recovery) (10,311 ) (24 ) Amounts (charged) recovered against the allowance (6,019 ) 2 Allowance for doubtful accounts at end of period $ 1,372 $ 976 Accounts receivable, net classified as current consisted of the following (dollars in thousands): April 27, 2019 January 26, 2019 Trade accounts receivable $ 299,572 $ 331,903 Unbilled accounts receivable 393,198 283,463 Retainage 10,124 10,831 Total 702,894 626,197 Less: allowance for doubtful accounts (1,372 ) (939 ) Accounts receivable, net $ 701,522 $ 625,258
Contract with Customer, Asset and Liability	Net contract assets consisted of the following (dollars in thousands): April 27, 2019 January 26, 2019 Contract assets $ 297,630 $ 215,849 Contract liabilities 12,815 15,125 Contract assets, net $ 284,815 $ 200,724
Accounts Receivable Risk	Customers whose combined amounts of trade accounts receivable and contract assets, net exceeded 10% of total combined accounts receivable and contract assets, net as of April 27, 2019 or January 26, 2019 were as follows (dollars in millions): April 27, 2019 January 26, 2019 Amount % of Total Amount % of Total Verizon Communications Inc. $ 390.3 39.6% $ 298.4 36.2% CenturyLink, Inc. $ 152.7 15.5% $ 147.2 17.9% Comcast Corporation $ 131.1 13.3% $ 127.2 15.4% AT&T Inc. $ 114.3 11.6% $ 90.6 11.0% Total contract revenues by customer type during the three months ended April 27, 2019 and April 28, 2018 were as follows (dollars in millions): For the Three Months Ended April 27, 2019 April 28, 2018 Amount % of Total Amount % of Total Telecommunications $ 761.4 91.3% $ 667.2 91.2% Underground facility locating 48.2 5.8 45.1 6.2 Electrical and gas utilities and other 24.1 2.9 19.1 2.6 Total contract revenues $ 833.7 100.0% $ 731.4 100.0% Customers whose contract revenues exceeded 10% of total contract revenues during the three months ended April 27, 2019 or April 28, 2018 , as well as total contract revenues from all other customers combined, were as follows (dollars in millions): For the Three Months Ended April 27, 2019 April 28, 2018 Amount % of Total Amount % of Total AT&T Inc. $ 209.3 25.1% $ 177.0 24.2% Verizon Communications Inc. 179.8 21.6 122.1 16.7 Comcast Corporation 137.1 16.4 159.2 21.8 CenturyLink, Inc. 109.8 13.2 89.7 12.3 Total other customers combined 197.7 23.7 183.4 25.0 Total contract revenues $ 833.7 100.0% $ 731.4 100.0%

Other Current Assets and Othe_2

Other Current Assets and Other Assets (Tables)	3 Months Ended
	Apr. 27, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Other Current Assets	Other current assets consisted of the following (dollars in thousands): April 27, 2019 January 26, 2019 Prepaid expenses $ 20,045 $ 12,758 Deposits and other current assets 14,137 14,762 Insurance recoveries/receivables for accrued insurance claims 2,100 — Restricted cash 1,556 1,556 Receivables on equipment sales 404 69 Total other current assets $ 38,242 $ 29,145
Schedule of Non current Assets	Other assets (long-term) consisted of the following (dollars in thousands): April 27, 2019 January 26, 2019 Long-term contract assets $ 28,368 $ 30,399 Deferred financing costs 8,534 9,036 Restricted cash 3,753 4,253 Insurance recoveries/receivables for accrued insurance claims 5,007 13,684 Long-term accounts receivable, net — 24,815 Other non-current deposits and assets 7,122 7,251 Total other assets $ 52,784 $ 89,438

Cash and Equivalents and Rest_2

Cash and Equivalents and Restricted Cash (Tables)	3 Months Ended
	Apr. 27, 2019
Cash and Cash Equivalents [Abstract]
Schedule of Cash and Cash Equivalents	Amounts of cash and equivalents and restricted cash reported in the condensed consolidated statement of cash flows consisted of the following (dollars in thousands): April 27, 2019 January 26, 2019 Cash and equivalents $ 33,579 $ 128,342 Restricted cash included in: Other current assets 1,556 1,556 Other assets (long-term) 3,753 4,253 Total cash and equivalents and restricted cash $ 38,888 $ 134,151
Schedule of Restricted Cash and Cash Equivalents	Amounts of cash and equivalents and restricted cash reported in the condensed consolidated statement of cash flows consisted of the following (dollars in thousands): April 27, 2019 January 26, 2019 Cash and equivalents $ 33,579 $ 128,342 Restricted cash included in: Other current assets 1,556 1,556 Other assets (long-term) 3,753 4,253 Total cash and equivalents and restricted cash $ 38,888 $ 134,151

Property and Equipment (Tables)

Property and Equipment (Tables)	3 Months Ended
	Apr. 27, 2019
Property, Plant and Equipment [Abstract]
Schedule of Property and Equipment	Property and equipment consisted of the following (dollars in thousands): Estimated Useful Lives (Years) April 27, 2019 January 26, 2019 Land — $ 4,024 $ 4,359 Buildings 10-35 12,725 13,555 Leasehold improvements 1-10 16,694 16,185 Vehicles 1-5 606,576 589,741 Computer hardware and software 1-7 145,124 140,327 Office furniture and equipment 1-10 13,189 12,804 Equipment and machinery 1-10 302,708 296,408 Total 1,101,040 1,073,379 Less: accumulated depreciation (671,730 ) (648,628 ) Property and equipment, net $ 429,310 $ 424,751

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	3 Months Ended
	Apr. 27, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The goodwill balance consisted of the following (dollars in thousands): April 27, 2019 Goodwill, gross $ 521,516 Accumulated impairment losses (195,767 ) Total $ 325,749
Schedule of Intangible Assets	The Company’s intangible assets consisted of the following (dollars in thousands): April 27, 2019 January 26, 2019 Weighted Average Remaining Useful Lives (Years) Gross Carrying Amount Accumulated Amortization Intangible Assets, Net Gross Carrying Amount Accumulated Amortization Intangible Assets, Net Customer relationships 10.8 $ 312,017 $ 162,918 $ 149,099 $ 312,017 $ 157,691 $ 154,326 Trade names, finite 8.0 10,350 8,417 1,933 10,350 8,312 2,038 Trade name, indefinite — 4,700 — 4,700 4,700 — 4,700 Non-compete agreements 1.3 200 149 51 200 139 61 $ 327,267 $ 171,484 $ 155,783 $ 327,267 $ 166,142 $ 161,125

Accrued Insurance Claims (Table

Accrued Insurance Claims (Tables)	3 Months Ended
	Apr. 27, 2019
Accrued Insurance Claims [Abstract]
Accrued Insurance Disclosure	Amounts for total accrued insurance claims and insurance recoveries/receivables are as follows (dollars in thousands): April 27, 2019 January 26, 2019 Accrued insurance claims - current $ 44,035 $ 39,961 Accrued insurance claims - non-current 59,793 68,315 Total accrued insurance claims $ 103,828 $ 108,276 Insurance recoveries/receivables: Current (included in Other current assets) $ 2,100 $ — Non-current (included in Other assets) 5,007 13,684 Total insurance recoveries/receivables $ 7,107 $ 13,684

Leases (Tables)

Leases (Tables)	3 Months Ended
	Apr. 27, 2019
Leases [Abstract]
Lease Cost, Supplemental Balance Sheet, and Supplmental Cash Flows	The following table summarizes the components of lease cost recognized in the condensed consolidated statements of operations for the three months ended April 27, 2019 (dollars in thousands): For the Three Months Ended April 27, 2019 Lease cost under long-term operating leases $ 8,331 Lease cost under short-term operating leases 8,406 Variable lease cost under short-term and long-term operating leases (1) 1,210 Total lease cost $ 17,947 (1) Variable lease expense primarily includes insurance, maintenance, and other operating expenses related to the Company’s leased office facilities. The Company’s operating lease liabilities related to long-term operating leases were $69.5 million as of April 27, 2019 . Supplemental balance sheet information related to these liabilities is as follows (dollars in thousands): April 27, 2019 Weighted average remaining lease term 3.4 years Weighted average discount rate 5.3 % Supplemental cash flow information related to the Company’s long-term operating lease liabilities as of April 27, 2019 is as follows (dollars in thousands): For the Three Months Ended April 27, 2019 Cash paid for amounts included in the measurement of lease liabilities: $ 8,189 Operating lease right-of-use assets obtained in exchange for operating lease liabilities: $ 5,513
Operating Lease Liability Maturity Schedule	As of April 27, 2019 , maturities of the Company’s lease liabilities under its long-term operating leases for the next five fiscal years and thereafter are as follows (dollars in thousands): Fiscal Year Amount Remainder of 2020 $ 21,954 2021 23,394 2022 15,382 2023 7,678 2024 4,885 Thereafter 4,132 Total lease payments 77,425 Less: imputed interest (7,904 ) Total $ 69,521
Operating Lease Laibility Mauturity Schedule Before Adoption	As of January 26, 2019 , the future minimum obligation by fiscal year for the Company’s operating leases with original noncancelable terms in excess of one year was as follows (dollars in thousands): Fiscal Year Amount 2020 $ 28,415 2021 20,166 2022 12,919 2023 6,686 2024 4,342 Thereafter 3,675 Total $ 76,203

Other Accrued Liabilities (Tabl

Other Accrued Liabilities (Tables)	3 Months Ended
	Apr. 27, 2019
Payables and Accruals [Abstract]
Schedule of Other Accrued Liabilities	Other accrued liabilities consisted of the following (dollars in thousands): April 27, 2019 January 26, 2019 Accrued payroll and related taxes $ 28,420 $ 25,591 Accrued employee benefit and incentive plan costs 9,475 25,482 Accrued construction costs 51,439 36,449 Other current liabilities 20,056 16,552 Total other accrued liabilities $ 109,390 $ 104,074 During the three months ended April 27, 2019 , accrued construction costs increased approximately $15.0 million primarily due to an $8.2 million charge for estimated warranty costs for work performed for a customer in prior periods.

Debt (Tables)

Debt (Tables)	3 Months Ended
	Apr. 27, 2019
Debt Disclosure [Abstract]
Outstanding Indebtedness	The Company’s outstanding indebtedness consisted of the following (dollars in thousands): April 27, 2019 January 26, 2019 Credit Agreement - Revolving facility (matures October 2023) $ — $ — Credit Agreement - Term loan facility (matures October 2023) 450,000 450,000 0.75% convertible senior notes, net (mature September 2021) 428,626 423,199 878,626 873,199 Less: current portion (11,250 ) (5,625 ) Long-term debt $ 867,376 $ 867,574
Schedule Interest Rates for the Credit Agreement	Under the Credit Agreement, borrowings bear interest at the rates described below based upon the Company’s consolidated net leverage ratio, which is the ratio of the Company’s consolidated total funded debt reduced by unrestricted cash and equivalents in excess of $50.0 million 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 net 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 0.20% - 0.40% Standby Letters of Credit 1.25% - 2.00% Commercial Letters of Credit 0.625% - 1.00% (1) The administrative agent’s base rate is described in the Credit Agreement as the highest of (i) the Federal Funds Rate plus 0.50% , (ii) the administrative agent’s prime rate, and (iii) the Eurodollar rate plus 1.00% . The weighted average interest rates and fees for balances under the Credit Agreement as of April 27, 2019 and January 26, 2019 were as follows: Weighted Average Rate End of Period April 27, 2019 January 26, 2019 Borrowings - Term loan facilities 4.24% 4.25% 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 April 27, 2019 or January 26, 2019 .
Convertible Debt	The following table summarizes the fair value of the Notes, net of the debt discount and debt issuance costs. The fair value of the Notes is based on the closing trading price per $100 of the Notes as of the last day of trading for the respective periods (Level 2), which was $95.50 and $96.31 as of April 27, 2019 and January 26, 2019 , respectively (dollars in thousands): April 27, 2019 January 26, 2019 Fair value of principal amount of Notes $ 463,175 $ 467,104 Less: Debt discount and debt issuance costs (56,374 ) (61,801 ) Fair value of Notes $ 406,801 $ 405,303 The liability component of the Notes consisted of the following (dollars in thousands): April 27, 2019 January 26, 2019 Liability component Principal amount of 0.75% convertible senior notes due September 2021 $ 485,000 $ 485,000 Less: Debt discount (50,863 ) (55,795 ) Less: Debt issuance costs (5,511 ) (6,006 ) Net carrying amount of Notes $ 428,626 $ 423,199

Other Income, Net (Tables)

Other Income, Net (Tables)	3 Months Ended
	Apr. 27, 2019
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 April 27, 2019 April 28, 2018 Gain on sale of fixed assets $ 6,738 $ 8,415 Discount fee expense (1,298 ) (940 ) Miscellaneous income, net 258 236 Total other income, net $ 5,698 $ 7,711

Stock-Based Awards (Tables)

Stock-Based Awards (Tables)	3 Months Ended
	Apr. 27, 2019
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 during the three months ended April 27, 2019 and April 28, 2018 were as follows (dollars in thousands): For the Three Months Ended April 27, 2019 April 28, 2018 Stock-based compensation $ 3,479 $ 4,863 Income tax effect of stock-based compensation $ 869 $ 1,069
Schedule of Share-based Compensation, Stock Options Award Activity	The following table summarizes stock option award activity during the three months ended April 27, 2019 : Stock Options Shares Weighted Average Exercise Price Outstanding as of January 26, 2019 583,291 $ 34.24 Granted 39,276 $ 45.94 Options exercised (9,850 ) $ 10.71 Canceled — $ — Outstanding as of April 27, 2019 612,717 $ 35.37 Exercisable options as of April 27, 2019 510,220 $ 27.86
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 April 27, 2019 : Restricted Stock RSUs Performance RSUs Share Units Weighted Average Grant Date Fair Value Share Units Weighted Average Grant Date Fair Value Outstanding as of January 26, 2019 126,470 $ 87.92 377,354 $ 96.51 Granted 89,863 $ 46.18 475,629 $ 45.94 Share units vested (13,356 ) $ 95.27 (43,900 ) $ 93.49 Forfeited or canceled (123 ) $ 81.85 (29,002 ) $ 103.15 Outstanding as of April 27, 2019 202,854 $ 68.95 780,081 $ 65.60

Concentration of Credit Risk (T

Concentration of Credit Risk (Tables)	3 Months Ended
	Apr. 27, 2019
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 combined amounts of trade accounts receivable and contract assets, net exceeded 10% of total combined accounts receivable and contract assets, net as of April 27, 2019 or January 26, 2019 were as follows (dollars in millions): April 27, 2019 January 26, 2019 Amount % of Total Amount % of Total Verizon Communications Inc. $ 390.3 39.6% $ 298.4 36.2% CenturyLink, Inc. $ 152.7 15.5% $ 147.2 17.9% Comcast Corporation $ 131.1 13.3% $ 127.2 15.4% AT&T Inc. $ 114.3 11.6% $ 90.6 11.0% Total contract revenues by customer type during the three months ended April 27, 2019 and April 28, 2018 were as follows (dollars in millions): For the Three Months Ended April 27, 2019 April 28, 2018 Amount % of Total Amount % of Total Telecommunications $ 761.4 91.3% $ 667.2 91.2% Underground facility locating 48.2 5.8 45.1 6.2 Electrical and gas utilities and other 24.1 2.9 19.1 2.6 Total contract revenues $ 833.7 100.0% $ 731.4 100.0% Customers whose contract revenues exceeded 10% of total contract revenues during the three months ended April 27, 2019 or April 28, 2018 , as well as total contract revenues from all other customers combined, were as follows (dollars in millions): For the Three Months Ended April 27, 2019 April 28, 2018 Amount % of Total Amount % of Total AT&T Inc. $ 209.3 25.1% $ 177.0 24.2% Verizon Communications Inc. 179.8 21.6 122.1 16.7 Comcast Corporation 137.1 16.4 159.2 21.8 CenturyLink, Inc. 109.8 13.2 89.7 12.3 Total other customers combined 197.7 23.7 183.4 25.0 Total contract revenues $ 833.7 100.0% $ 731.4 100.0%

Basis of Presentation (Details)

Basis of Presentation (Details)	3 Months Ended
	Apr. 27, 2019segment
Basis of Presentation [Abstract]
Number of reportable segments	1

Accounting Standards - Narrativ

Accounting Standards - Narratives (Details) - USD ($) $ in Thousands	Apr. 27, 2019	Jan. 27, 2019	Jan. 26, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset	$ 69,065		$ 0
Operating lease liability related to long-term operating leases	$ 69,521
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset		$ 71,000
Operating lease liability related to long-term operating leases		$ 71,000

Computation of Earnings Per C_3

Computation of Earnings Per Common Share - Basic and Diluted Earnings Calculation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Apr. 27, 2019	Apr. 28, 2018
Basic earnings per unit
Net income	$ 14,279	$ 17,231
Weighted-average number of common shares (in shares)	31,451,809	31,190,366
Basic earnings per common share (in dollars per share)	$ 0.45	$ 0.55
Diluted earnings per unit
Weighted-average number of common shares (in shares)	31,451,809	31,190,366
Potential common stock arising from stock options, and unvested restricted share units (in shares)	334,650	602,549
Potential shares of common stock issuable on exercise of convertible senior notes	0	614,999
Total shares-diluted (in shares)	31,786,459	32,407,914
Diluted earnings per common share (in dollars per share)	$ 0.45	$ 0.53
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares)	10,277,839	9,477,316
Stock-based awards
Diluted earnings per unit
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares)	266,371	80,847
Convertible senior notes
Diluted earnings per unit
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares)	5,005,734	4,390,735
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 C_4

Computation of Earnings Per Common Share - Narratives (Details) - $ / shares	Apr. 27, 2019	Apr. 28, 2018	Sep. 15, 2015
Convertible Note Hedge
Shares used in computing earnings per common share:
Debt instrument, convertible, conversion price (per share)	$ 96.89		$ 96.89
0.75% Convertible Senior Notes Due 2021
Shares used in computing earnings per common share:
Debt, interest rate (in percent)	0.75%
Debt instrument, convertible, conversion price (per share)			96.89
Class of warrant or right, exercise price of warrants or rights (per warrant)	$ 130.43		$ 130.43
Weighted Average | 0.75% Convertible Senior Notes Due 2021
Shares used in computing earnings per common share:
Share price (usd per share)		$ 110.46

Acquisitions - Narratives (Deta

Acquisitions - Narratives (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Mar. 31, 2018	Apr. 27, 2019
Business Acquisition [Line Items]
Working capital adjustment		$ 0.5
Aero Communications, Inc.
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired	$ 20.9

Acquisitions - Purchase Price A

Acquisitions - Purchase Price Allocation (Details) - Prior Year Acquisitions [Member] $ in Millions	Apr. 27, 2019USD ($)
Business Acquisition [Line Items]
Accounts receivable	$ 5.6
Inventories and other current assets	0.2
Property and equipment	0.5
Goodwill	4
Total assets	22.6
Accounts payable	2.2
Total liabilities	2.2
Net Assets Acquired	20.4
Customer relationships
Business Acquisition [Line Items]
Intangible assets	$ 12.3

Accounts Receivable (Details)

Accounts Receivable (Details) - USD ($) $ in Thousands	Apr. 27, 2019	Jan. 26, 2019	Apr. 28, 2018	Jan. 27, 2018
Receivables [Abstract]
Contract with Customer, Asset, Net	$ 284,815	$ 200,724
Trade accounts receivable	299,572	331,903
Unbilled accounts receivable	393,198	283,463
Retainage	10,124	10,831
Total	702,894	626,197
Less: allowance for doubtful accounts	(1,372)	(17,702)	$ (976)	$ (998)
Allowance for Doubtful Accounts Receivable, Current		939
Accounts receivable, net	$ 701,500	$ 625,300

Accounts Receivable - Narrative

Accounts Receivable - Narratives (Details) - USD ($) $ in Thousands	Apr. 27, 2019	Jan. 26, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Net	$ 701,500	$ 625,300
Accounts Receivable, Net, Current	$ 701,522	$ 625,258

Accounts Receivable Contract As

Accounts Receivable Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 27, 2019	Jan. 26, 2019
Receivables [Abstract]
Contract assets	$ 297,630	$ 215,849
Contract liabilities	12,815	15,125
Contract assets, net	284,815	$ 200,724
Contract with Customer, Liability, Revenue Recognized	$ 8,000

Accounts Receivable Concentrati

Accounts Receivable Concentration Risk (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Jan. 26, 2019
Concentration Risk
Accounts receivable, net	$ 701,522		$ 625,258
Concentration risk percentage	100.00%	100.00%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | AT&T Inc.
Concentration Risk
Accounts receivable, net	$ 131,100		$ 127,200
Concentration risk percentage	13.30%		15.40%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | Comcast Corporation
Concentration Risk
Accounts receivable, net	$ 390,300		$ 298,400
Concentration risk percentage	39.60%		36.20%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | Comcast Corporation
Concentration Risk
Accounts receivable, net	$ 152,700		$ 147,200
Concentration risk percentage	15.50%		17.90%
Customer Concentration Risk | Trade Accounts Receivable and Costs and Estimated Earnings | AT&T Inc.
Concentration Risk
Accounts receivable, net	$ 114,300		$ 90,600
Concentration risk percentage	11.60%		11.00%

Accounts Receivable Allowance f

Accounts Receivable Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 27, 2019	Apr. 28, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts at beginning of period	$ 17,702	$ 998
Provision for bad debt (recovery)	(10,311)	(24)
Amounts (charged) recovered against the allowance	(6,019)	2
Allowance for doubtful accounts at end of period	1,372	$ 976
Windstream Corporation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts at beginning of period	16,800
Provision for bad debt (recovery)	$ 10,300

Other Current Assets and Othe_3

Other Current Assets and Other Assets - Current (Details) - USD ($) $ in Thousands	Apr. 27, 2019	Jan. 26, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid expenses	$ 20,045	$ 12,758
Deposits and other current assets	14,137	14,762
Insurance recoveries/receivables for accrued insurance claims	2,100	0
Restricted cash	1,556	1,556
Receivables on equipment sales	404	69
Total other current assets	$ 38,242	$ 29,145

Other Current Assets and Othe_4

Other Current Assets and Other Assets - Non-current (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Jan. 26, 2019
Accounts Receivable, Net	$ 701,500		$ 625,300
Provision for bad debt (recovery)	(10,311)	$ (24)
Long-term contract assets	28,368		30,399
Deferred financing costs	8,534		9,036
Restricted cash	3,753		4,253
Insurance recoveries/receivables for accrued insurance claims	5,007		13,684
Long-term accounts receivable, net	0		24,815
Other non-current deposits and assets	7,122		7,251
Total other assets	52,784		$ 89,438
Decrease in accrued insurance claims	$ (6,600)

Cash and Equivalents and Rest_3

Cash and Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Apr. 27, 2019	Jan. 26, 2019	Apr. 28, 2018	Jan. 27, 2018
Cash and Cash Equivalents [Abstract]
Cash and equivalents	$ 33,579	$ 128,342
Restricted cash included in:
Other current assets	1,556	1,556
Other assets (long-term)	3,753	4,253
Total cash and equivalents and restricted cash	$ 38,888	$ 134,151	$ 64,099	$ 90,182

Property and Equipment (Details

Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 27, 2019	Jan. 26, 2019
Property, Plant and Equipment [Line Items]
Total	$ 1,101,040	$ 1,073,379
Less: accumulated depreciation	(671,730)	(648,628)
Property and equipment, net	429,310	424,751
Land
Property, Plant and Equipment [Line Items]
Total	4,024	4,359
Buildings
Property, Plant and Equipment [Line Items]
Total	$ 12,725	13,555
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	$ 16,694	16,185
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	$ 606,576	589,741
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	$ 145,124	140,327
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	$ 13,189	12,804
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	$ 302,708	$ 296,408
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
	Apr. 27, 2019	Apr. 28, 2018
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 41	$ 37.7

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Narratives (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Jan. 26, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 325,749		$ 325,749
Amortization of intangible assets	$ 5,300	$ 5,700

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) $ in Thousands	Apr. 27, 2019USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill gross	$ 521,516
Accumulated impairment losses	$ (195,767)

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Jan. 26, 2019
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 5,300	$ 5,700
Intangible Assets, Gross (Excluding Goodwill)	327,267		$ 327,267
Accumulated Amortization	171,484		166,142
Intangible Assets, Net	155,783		161,125
UtiliQuest
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	4,700		4,700
Accumulated Amortization	0		0
Intangible Assets, Net	$ 4,700		4,700
Customer relationships
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Usesul life	10 years 9 months
Intangible Assets, Gross (Excluding Goodwill)	$ 312,017		312,017
Accumulated Amortization	162,918		157,691
Intangible Assets, Net	$ 149,099		154,326
Trade names
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Usesul life	8 years
Intangible Assets, Gross (Excluding Goodwill)	$ 10,350		10,350
Accumulated Amortization	8,417		8,312
Intangible Assets, Net	$ 1,933		2,038
Non-compete agreements
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Usesul life	1 year 3 months
Intangible Assets, Gross (Excluding Goodwill)	$ 200		200
Accumulated Amortization	149		139
Intangible Assets, Net	$ 51		$ 61

Accrued Insurance Claims - Narr

Accrued Insurance Claims - Narratives (Details)	3 Months Ended
	Apr. 27, 2019USD ($)state
Accrued Insurance Claims [Line Items]
Insurance Liability, Annual Retained Risk of Loss, Under Employee Health Plan Per Participant, Maximum Threshold	$ 425,000
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	$ 77,100,000
Insurance liability, annual retained risk loss	400,000
Decrease in accrued insurance claims	(6,600,000)
Maximum
Accrued Insurance Claims [Line Items]
Retained risk of loss, general liability and workers' compensation, maximum automobile liability	$ 1,000,000

Accrued Insurance Claims (Detai

Accrued Insurance Claims (Details) - USD ($) $ in Thousands	Apr. 27, 2019	Jan. 26, 2019
Accrued Insurance Claims [Abstract]
Accrued insurance claims - current	$ 44,035	$ 39,961
Accrued insurance claims - non-current	59,793	68,315
Total accrued insurance claims	103,828	108,276
Insurance recoveries/receivables:
Current (included in Other current assets)	2,100	0
Non-current (included in Other assets)	5,007	13,684
Insurance Settlements Receivable	$ 7,107	$ 13,684

Leases - Narratives (Details)

Leases - Narratives (Details) $ in Thousands	Apr. 27, 2019USD ($)
Lessee, Lease, Description
Operating lease reneewal term	5 years
Operating lease liability related to long-term operating leases	$ 69,521
Operating lease that have yet to commence	$ 2,200
Minimum
Lessee, Lease, Description
Operating lease term	1 year
Maximum
Lessee, Lease, Description
Operating lease term	6 years

Leases - Lease Cost and Supplem

Leases - Lease Cost and Supplemental Balance Sheet Information (Details) $ in Thousands	3 Months Ended
	Apr. 27, 2019USD ($)
Leases [Abstract]
Lease cost under long-term operating leases	$ 8,331
Lease cost under short-term operating leases	8,406
Variable lease cost under short-term and long-term operating leases	1,210
Total lease cost	$ 17,947
Operating Lease, Weighted Average Remaining Lease Term	3 years 4 months 24 days
Weighted average discount rate (percent)	5.30%

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flows (Details) $ in Thousands	3 Months Ended
	Apr. 27, 2019USD ($)
Leases [Abstract]
Cash paid for amounts included in the measurement of lease liabilities:	$ 8,189
Operating lease right-of-use assets obtained in exchange for operating lease liabilities:	$ 5,513

Leases - Operating Lease Liabil

Leases - Operating Lease Liability Maturity Schedule (Details) $ in Thousands	Apr. 27, 2019USD ($)
Operating Lease Liabilities After Adoption
Remainder of 2020	$ 21,954
2021	23,394
2022	15,382
2023	7,678
2024	4,885
Thereafter	4,132
Total lease payments	77,425
Less: imputed interest	(7,904)
Total	$ 69,521

Leases - Operating Lease Liab_2

Leases - Operating Lease Liability Maturity Schedule Before Adoption (Details) $ in Thousands	Jan. 26, 2019USD ($)
Operating Leases, Future Minimum Payments Due Before Adoption
2020	$ 28,415
2021	20,166
2022	12,919
2023	6,686
2024	4,342
Thereafter	3,675
Total	$ 76,203

Other Accrued Liabilities (Deta

Other Accrued Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 27, 2019	Jan. 26, 2019
Payables and Accruals [Abstract]
increase in accrued construction costs, Current	$ 15,000
Product Warranty Expense	8,200
Accrued payroll and related taxes	28,420	$ 25,591
Accrued employee benefit and incentive plan costs	9,475	25,482
Accrued construction costs	51,439	36,449
Other current liabilities	20,056	16,552
Total other accrued liabilities	$ 109,390	$ 104,074

Debt - Schedule of Debt (Detail

Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Apr. 27, 2019	Jan. 26, 2019
Debt Instrument [Line Items]
Debt and capital lease obligations	$ 878,626	$ 873,199
Less: current portion	(11,250)	(5,625)
Long-term debt	867,376	867,574
0.75% Convertible Senior Notes Due 2021
Debt Instrument [Line Items]
Debt and capital lease obligations	$ 428,626	423,199
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	$ 450,000	$ 450,000

Debt - Senior Credit Agreement

Debt - Senior Credit Agreement (Details)	Sep. 15, 2015USD ($)	Apr. 27, 2019USD ($)	Jan. 26, 2019USD ($)	Oct. 19, 2018USD ($)
Line of Credit Facility [Line Items]
Letters of credit outstanding amount		$ 52,300,000	$ 48,600,000
Additional borrowing availability		325,400,000	412,900,000
Standby Letters of Credit
Line of Credit Facility [Line Items]
Line of credit maximum borrowing capacity				$ 200,000,000
Letters of credit outstanding amount		52,300,000	$ 48,600,000
Incremental Facility, Minimum
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 350,000,000
Credit Agreement - Term Loan (matures April 2020)
Line of Credit Facility [Line Items]
Line of credit maximum borrowing capacity				450,000,000
Debt instrument, covenant compliance, consolidated leverage ratio, maximum	2.25
Unrestricted cash and cash equivalents threshold		$ 50,000,000
Credit Agreement - Revolving facility (matures April 2020)
Line of Credit Facility [Line Items]
Line of credit maximum borrowing capacity	$ 450,000,000			$ 750,000,000
Unutilized commitment fee (in percent)		0.35%	0.35%
Minimum
Line of Credit Facility [Line Items]
Debt instrument, covenant compliance, consolidated leverage ratio, maximum		3.50
Debt instrument, covenant compliance, consolidated interest coverage ratio, maximum		3
Minimum | Standby Letters of Credit
Line of Credit Facility [Line Items]
Unutilized commitment fee (in percent)		1.25%
Minimum | Credit Agreement - Revolving facility (matures April 2020)
Line of Credit Facility [Line Items]
Unutilized commitment fee (in percent)		0.20%
Maximum
Line of Credit Facility [Line Items]
Debt instrument, covenant compliance, consolidated leverage ratio, maximum		1
Debt instrument, covenant compliance, consolidated interest coverage ratio, maximum		1
Maximum | Standby Letters of Credit
Line of Credit Facility [Line Items]
Unutilized commitment fee (in percent)		2.00%
Maximum | Credit Agreement - Revolving facility (matures April 2020)
Line of Credit Facility [Line Items]
Unutilized commitment fee (in percent)		0.40%
0.75% Convertible Senior Notes Due 2021
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 485,000,000	$ 485,000,000	$ 485,000,000
Outstanding debt threshold		250,000,000
Credit agreement liquidity requirement		$ 150,000,000

Debt - Interest Rates of the Cr

Debt - Interest Rates of the Credit Agreement (Details)	3 Months Ended	12 Months Ended
	Apr. 27, 2019	Jan. 26, 2019
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)	0.20%
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	12 Months Ended
	Apr. 27, 2019	Jan. 26, 2019
Line of Credit Facility [Line Items]
Debt Instrument Fair Value, Per Stated Incremental Portion on Principal	$ 95.50	$ 96.31
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	4.24%	4.25%
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	Apr. 27, 2019USD ($)	Apr. 28, 2018USD ($)	Oct. 24, 2015trading_day	Jan. 26, 2019USD ($)
Debt Instrument [Line Items]
Amortization of debt discount		$ 4,932,000	$ 4,672,000
0.75% Convertible Senior Notes Due 2021
Debt Instrument [Line Items]
Debt, interest rate (in percent)		0.75%
Debt intrument, conversion installments amount	$ 1,000
Debt instrument,conversion ratio	10.3211
Debt instrument, face amount	$ 485,000,000	$ 485,000,000			$ 485,000,000
Debt instrument, convertible, conversion price (per share) | $ / shares	$ 96.89
Convertible debt, trading day threshold | trading_day				20
Convertible debt, consecutive trading day threshold | trading_day				30
Convertible debt, percentage of stock trigger price threshold				130.00%
Debt instrument conversion trigger price | $ / shares	$ 125.96
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		$ 4,900,000	$ 4,700,000
Convertible Debt		428,626,000			423,199,000
Unamortized discount		50,863,000			55,795,000
Debt issuance cost		5,511,000			6,006,000
Standby Letters of Credit
Debt Instrument [Line Items]
Line of credit		$ 0			$ 0

Debt - Components of the Conver

Debt - Components of the Convertible Notes (Details) - USD ($)	3 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Jan. 26, 2019	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	4,932,000	$ 4,672,000
Estimate of Fair Value Measurement
Debt Instrument [Line Items]
Debt instrument, face amount	463,175,000		$ 467,104,000
Less: Debt discount and debt issuance costs	(56,374,000)		(61,801,000)
Net carrying amount of Notes	406,801,000		405,303,000
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	(50,863,000)		(55,795,000)
Debt issuance cost	(5,511,000)		(6,006,000)
Net carrying amount of Notes	428,626,000		$ 423,199,000
Amortization of debt discount	$ 4,900,000	$ 4,700,000

Debt - Convertible Note Hedge a

Debt - Convertible Note Hedge and Warrant Transactions (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	Apr. 27, 2019	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 liability		$ 43.4
Deferred tax asset, derivative instrument		$ 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 warrant or right, exercise price of warrants or rights (per warrant)	$ 130.43	$ 130.43

Income Taxes - Narratives (Deta

Income Taxes - Narratives (Details)	3 Months Ended
	Apr. 27, 2019Rate	Apr. 28, 2018Rate
Income Tax Disclosure [Abstract]
Effective tax rate	30.30%	27.30%

Other Income, Net (Details)

Other Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 27, 2019	Apr. 28, 2018
Other Income and Expenses [Abstract]
Gain on sale of fixed assets	$ 6,738	$ 8,415
Miscellaneous income, net	258	236
Discount fee expense	$ 1,298	$ 940

Capital Stock - Narratives (Det

Capital Stock - Narratives (Details) - USD ($) $ in Millions	Apr. 27, 2019	Aug. 29, 2018
Stockholders' Equity Note [Abstract]
Shares repurchased value		$ 150
Remaining authorized shares for repurchases	$ 150

Stock-Based Awards - Tax Benefi

Stock-Based Awards - Tax Benefit Recognized (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 27, 2019	Apr. 28, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based compensation	$ 3,479	$ 4,863
Income tax effect of stock-based compensation	$ 869	$ 1,069

Stock-Based Awards - Narratives

Stock-Based Awards - Narratives (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Jan. 26, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net tax (deficiency) benefit	$ (0.6)	$ 0.1
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to stock options	$ 3.1
Total compensation cost not yet recognized, period for recognition	2 years 7 months 1 day
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to stock options	$ 11.8
Total compensation cost not yet recognized, period for recognition	2 years 8 months 1 day
Granted (in shares)	89,863
Shares outstanding	202,854		126,470
Shares canceled (in shares)	123
Performance RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to stock options	$ 21.6
Total compensation cost not yet recognized, period for recognition	2 years 1 month 6 days
Compensation expense	$ 24.5
RSUs outstanding (in shares)	333,567
Granted (in shares)	475,629
Shares outstanding	780,081		377,354
Shares canceled (in shares)	29,002
Target Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding	552,904
Shares canceled (in shares)	12,331
Supplemental Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	142,062
Shares outstanding	227,177
Shares canceled (in shares)	13,556

Stock-Based Awards - Stock Opti

Stock-Based Awards - Stock Options (Details) - Stock Options	3 Months Ended
	Apr. 27, 2019$ / sharesshares
Stock Options, Outstanding [Roll Forward]
Beginning balance (in shares) | shares	583,291
Granted (in shares) | shares	39,276
Options exercised (in shares) | shares	(9,850)
Canceled (in shares) | shares	0
Ending balance (in shares) | shares	612,717
Exercisable options (in shares) | shares	510,220
Stock Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Beginning balance (in dollars per shares) | $ / shares	$ 34.24
Options granted (in dollars per shares) | $ / shares	45.94
Options exercised (in dollars per shares) | $ / shares	10.71
Canceled (in dollars per shares) | $ / shares	0
Ending balance (in dollars per shares) | $ / shares	35.37
Weighted average remaining contractual life, shares exercisable (In years) | $ / shares	$ 27.86

Stock-Based Awards - RSU's and

Stock-Based Awards - RSU's and Performance RSU's (Details)	3 Months Ended
	Apr. 27, 2019$ / sharesshares
Target Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Outstanding [Roll Forward]
Forfeited or canceled (in shares)	(12,331)
Ending balance (in shares)	552,904
RSUs
Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Outstanding [Roll Forward]
Beginning balance (in shares)	126,470
Granted (in shares)	89,863
Share units vested (in shares)	(13,356)
Forfeited or canceled (in shares)	(123)
Ending balance (in shares)	202,854
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	$ 87.92
Granted (in dollars per shares) | $ / shares	46.18
Share units vested (in dollars per shares) | $ / shares	95.27
Forfeited or canceled (in dollars per shares) | $ / shares	81.85
Ending balance (in dollars per shares) | $ / shares	$ 68.95
Performance RSUs
Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Outstanding [Roll Forward]
Beginning balance (in shares)	377,354
Granted (in shares)	475,629
Share units vested (in shares)	(43,900)
Forfeited or canceled (in shares)	(29,002)
Ending balance (in shares)	780,081
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	$ 96.51
Granted (in dollars per shares) | $ / shares	45.94
Share units vested (in dollars per shares) | $ / shares	93.49
Forfeited or canceled (in dollars per shares) | $ / shares	103.15
Ending balance (in dollars per shares) | $ / shares	$ 65.60
Supplemental Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Outstanding [Roll Forward]
Granted (in shares)	142,062
Forfeited or canceled (in shares)	(13,556)
Ending balance (in shares)	227,177

Concentration of Credit Risk -

Concentration of Credit Risk - Narratives (Details) $ in Thousands	3 Months Ended
	Apr. 27, 2019USD ($)customerRate	Apr. 28, 2018USD ($)Rate	Jan. 26, 2019USD ($)
Concentration Risk
Number of customers classified as highly concentrated | customer	5
Concentration risk percentage	100.00%	100.00%
Accounts receivable, net	$ 701,522		$ 625,258
Revenue from Contract with Customer, Excluding Assessed Tax	$ 833,743	$ 731,375
Sales Revenue, Services, Net | Customer Concentration Risk
Concentration Risk
Concentration risk percentage	10.00%
Sales Revenue, Services, Net | Customer Concentration Risk | Five Unnamed Customers
Concentration Risk
Concentration risk percentage | Rate	80.40%	78.80%

Concentration of Credit Risk _2

Concentration of Credit Risk - Revenue Concentration Risk (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 27, 2019	Apr. 28, 2018
Concentration Risk
Contract revenues	$ 833,743	$ 731,375
Concentration risk percentage	100.00%	100.00%
Sales Revenue, Services, Net | Customer Concentration Risk
Concentration Risk
Concentration risk percentage	10.00%
Sales Revenue, Services, Net | Customer Concentration Risk | Five Unnamed Customers
Concentration Risk
Concentration risk percentage	80.40%	78.80%
Sales Revenue, Services, Net | Customer Concentration Risk | Verizon Communications Inc.
Concentration Risk
Contract revenues	$ 209,300	$ 177,000
Concentration risk percentage	25.10%	24.20%
Sales Revenue, Services, Net | Customer Concentration Risk | AT&T Inc.
Concentration Risk
Contract revenues	$ 137,100	$ 159,200
Concentration risk percentage	16.40%	21.80%
Sales Revenue, Services, Net | Customer Concentration Risk | Comcast Corporation
Concentration Risk
Contract revenues	$ 179,800	$ 122,100
Concentration risk percentage	21.60%	16.70%
Sales Revenue, Services, Net | Customer Concentration Risk | CenturyLink, Inc.
Concentration Risk
Contract revenues	$ 109,800	$ 89,700
Concentration risk percentage	13.20%	12.30%
Sales Revenue, Services, Net | Customer Concentration Risk | Total other customers combined
Concentration Risk
Contract revenues	$ 197,700	$ 183,400
Concentration risk percentage	23.70%	25.00%

Concentration of Credit Risk _3

Concentration of Credit Risk - Customer Type (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 27, 2019	Apr. 28, 2018
Concentration Risk
Contract revenues	$ 833,743	$ 731,375
Concentration risk percentage	100.00%	100.00%
Customer Concentration Risk | Sales Revenue, Services, Net
Concentration Risk
Concentration risk percentage	10.00%
Customer Concentration Risk | Sales Revenue, Services, Net | Telecommunications
Concentration Risk
Contract revenues	$ 761,400	$ 667,200
Concentration risk percentage	91.30%	91.20%
Customer Concentration Risk | Sales Revenue, Services, Net | Underground facility locating
Concentration Risk
Contract revenues	$ 48,200	$ 45,100
Concentration risk percentage	5.80%	6.20%
Customer Concentration Risk | Sales Revenue, Services, Net | Electrical and gas utilities and other
Concentration Risk
Contract revenues	$ 24,100	$ 19,100
Concentration risk percentage	2.90%	2.60%
Five Unnamed Customers | Customer Concentration Risk | Sales Revenue, Services, Net
Concentration Risk
Concentration risk percentage	80.40%	78.80%

Commitment and Contingencies -

Commitment and Contingencies - Narratives (Details) - USD ($) $ in Millions	1 Months Ended
	Dec. 31, 2016	Apr. 27, 2019	Jan. 26, 2019	Oct. 29, 2016
Loss Contingencies [Line Items]
Loss contingency, estimated loss				$ 13
Loss contingency accrual, payments	$ 0.1
Guarantor Obligations, Maximum Exposure, Undiscounted		$ 23.4	$ 23.2
Letters of credit outstanding amount		52.3	48.6
Standby Letters of Credit
Loss Contingencies [Line Items]
Letters of credit outstanding amount		52.3	48.6
Performance Guarantee and Surety Bond [Member]
Loss Contingencies [Line Items]
Guarantor obligations, carrying value		$ 142.8	$ 123.5