Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jan. 26, 2020	Jan. 27, 2019	Jan. 28, 2018
Cash flows from operating activities:
Net income	$ 31,866	$ 69,639	$ 34,649
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	39,581	49,639	48,999
Impairment of investments	1,211	30,000	4,250
Accretion of deferred financing costs and debt discount	484	528	568
Write-off of deferred financing costs and debt discount	514	0	0
Deferred income taxes	(5,596)	(16,047)	14,894
Share-based compensation and warrant costs	52,049	66,837	50,051
Loss (gain) on disposition of business operations and assets	378	(26)	276
Changes in the fair value of contingent earn-out obligations	(2,345)	(9,419)	3,892
Equity in net (gains) losses of equity method investments	(109)	126	254
Gain from sale of investment	0	(1,288)	0
Gain from convertible debt settlement	0	0	(4,275)
Corporate owned life insurance, net	5,613	(34)	1,601
Changes in assets and liabilities:
Accounts receivable, net	17,296	(21,499)	(1,453)
Inventories	(9,331)	8,444	(5,515)
Other assets	2,415	(587)	(5,957)
Accounts payable	2,603	7,543	(5,306)
Accrued liabilities	(19,532)	124	2,448
Income taxes payable	(2,105)	408	(15,718)
Other liabilities	3,624	(825)	(12,173)
Net cash provided by operating activities	118,616	183,563	111,485
Cash flows from investing activities:
Proceeds from convertible debt settlement	0	0	5,700
Proceeds from sales of property, plant and equipment	352	112	189
Purchase of property, plant and equipment	(23,056)	(17,052)	(35,461)
Purchase of investments	(11,630)	(9,297)	(18,665)
Acquisitions, net of cash acquired	0	(15,948)	(17,619)
Proceeds from sale of investments	0	5,967	0
Net cash used in investing activities	(34,334)	(36,218)	(65,856)
Cash flows from financing activities:
Payments of term loans	(115,312)	(15,938)	(15,000)
Proceeds from revolving line of credit	201,000	0	0
Payments of revolving line of credit	(101,000)	0	0
Deferred financing costs	(2,056)	0	0
Payments of earn-out	(237)	(8,736)	0
Payment for employee share-based compensation payroll taxes	(21,507)	(18,539)	(11,671)
Proceeds from exercise of stock options	6,002	16,275	6,680
Repurchase of common stock	(70,219)	(116,210)	(14,849)
Contributions from noncontrolling interest	251	0	0
Net cash used in financing activities	(103,078)	(143,148)	(34,840)
Net (decrease) increase in cash and cash equivalents	(18,796)	4,197	10,789
Cash and cash equivalents at beginning of period	312,120	307,923	297,134
Cash and cash equivalents at end of period	293,324	312,120	307,923
Supplemental disclosure of cash flow information:
Interest paid	7,906	8,588	6,341
Income taxes paid	11,157	7,740	31,013
Non-cash investing and financing activities:
(Increase) decrease in accounts payable related to capital expenditures	(2,223)	2,024	3,789
Conversion of note into equity	$ 0	$ 500	$ 0