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