CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jan. 27, 2018	Jul. 29, 2017	Jul. 30, 2016	Jul. 25, 2015
OPERATING ACTIVITIES:
Net income	$ 68,835	$ 157,217	$ 128,740	$ 84,324
Adjustments to reconcile net income to net cash provided by operating activities, net of acquisitions:
Depreciation and amortization	85,053	147,906	124,940	96,044
Deferred income tax (benefit) provision	(19,665)	18,233	26,782	1,244
Stock-based compensation	13,277	20,805	16,850	13,923
Bad debt expense, net	201	199	1,252	465
Gain on sale of fixed assets	(7,217)	(14,866)	(9,806)	(7,110)
Write-off of deferred financing fees and premium on long-term debt	0	0	2,017	0
Amortization of premium on long-term debt	0	0	(94)	(397)
Amortization of debt discount	9,170	17,610	14,709	0
Amortization of debt issuance costs and other	1,736	3,323	2,875	2,040
Excess tax benefit from share-based awards	0	(8,385)	(13,003)	(8,371)
Change in operating assets and liabilities:
Accounts receivable, net	50,955	(33,068)	2,729	(40,444)
Costs and estimated earnings in excess of billings, net	16,982	(27,773)	(70,957)	(41,021)
Other current assets and inventory	(67)	(13,232)	(13,800)	(1,138)
Other assets	1,630	2,064	(2,936)	(6,875)
Income taxes receivable/payable	(6,716)	(13,189)	20,148	11,758
Accounts payable	(21,503)	977	15,132	7,114
Accrued liabilities, insurance claims, and other liabilities	(32,138)	(1,378)	15,910	30,344
Net cash provided by operating activities	160,533	256,443	261,488	141,900
INVESTING ACTIVITIES:
Cash paid for acquisitions, net of cash acquired	0	(26,070)	(157,183)	(31,909)
Capital expenditures	(87,839)	(201,197)	(186,011)	(102,997)
Proceeds from sale of assets	11,808	16,029	10,540	9,392
Changes in restricted cash and other	(745)	266	(479)	(538)
Proceeds from acquisition working capital adjustment	0	1,825	0	0
Other investing activities	0	0	0	(4,000)
Net cash used in investing activities	(76,776)	(209,147)	(333,133)	(130,052)
FINANCING ACTIVITIES:
Proceeds from borrowings on senior credit agreement, including term loans	0	707,000	1,310,000	535,750
Principal payments on senior credit agreement, including term loans	(9,625)	(685,563)	(1,209,000)	(467,563)
Repurchase of common stock	(16,875)	(62,909)	(169,997)	(87,146)
Proceeds from issuance of 0.75% convertible senior notes due 2021	0	0	485,000	0
Proceeds from sale of warrants	0	0	74,690	0
Purchase of convertible note hedge	0	0	(115,818)	0
Principal payments for satisfaction and discharge of 7.125% senior subordinated notes	0	0	(277,500)	0
Debt issuance costs	0	(70)	(16,376)	(3,854)
Exercise of stock options	745	1,449	2,745	8,922
Restricted stock tax withholdings	(12,581)	(10,767)	(12,604)	(4,711)
Excess tax benefit from share-based awards	0	8,385	13,003	8,371
Principal payments on other financing activities	0	0	0	(1,000)
Net cash (used in) provided by financing activities	(38,336)	(42,475)	84,143	(11,231)
Net increase in cash and equivalents	45,421	4,821	12,498	617
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	38,608	33,787	21,289	20,672
CASH AND EQUIVALENTS AT END OF PERIOD	84,029	38,608	33,787	21,289
SUPPLEMENTAL DISCLOSURE OF OTHER CASH FLOW ACTIVITIES AND NON-CASH INVESTING AND FINANCING ACTIVITIES:
Cash paid for interest	7,748	16,505	15,917	25,369
Cash paid for taxes, net	4,749	88,060	31,159	39,057
Purchases of capital assets included in accounts payable or other accrued liabilities at period end	$ 1,634	$ 21,978	$ 7,196	$ 2,372