Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 26, 2020	Jan. 27, 2019
Cash flows from operating activities:
Net income	$ 59,867	$ 31,866	$ 69,639
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	31,867	39,951	49,639
Amortization of right-of-use assets	3,991	4,015	0
Investment impairments and credit loss reserves	6,769	1,211	30,000
Accretion of deferred financing costs and debt discount	482	484	528
Write-off of deferred financing cost and debt discount	0	514	0
Deferred income taxes	(7,396)	(5,596)	(16,047)
Share-based compensation and warrant costs	52,986	52,049	66,837
Loss (gain) on disposition of business operations and assets	61	378	(26)
Changes in the fair value of contingent earn-out obligations	(33)	(2,345)	(9,419)
Equity in net (gains) losses of equity method investments	(329)	(109)	126
Gain from sale of investment	0	0	(1,288)
Corporate owned life insurance, net	6,508	5,613	(34)
Changes in assets and liabilities:
Accounts receivable, net	(8,506)	17,296	(21,499)
Inventories	(14,484)	(9,331)	8,444
Other assets	(15,069)	2,415	(587)
Accounts payable	3,565	2,603	7,543
Accrued liabilities	2,309	(20,563)	124
Income taxes payable	0	(2,105)	408
Other liabilities	(3,658)	270	(825)
Net cash provided by operating activities	118,930	118,616	183,563
Cash flows from investing activities:
Proceeds from sales of property, plant and equipment	385	352	112
Purchase of property, plant and equipment	(32,734)	(23,056)	(17,052)
Purchase of investments	(10,938)	(11,630)	(9,297)
Acquisitions, net of cash acquired	0	0	(15,948)
Proceeds from sale of investments	378	0	5,967
Net cash used in investing activities	(42,909)	(34,334)	(36,218)
Cash flows from financing activities:
Payments of term loans	0	(115,312)	(15,938)
Proceeds from revolving line of credit	0	201,000	0
Payments of revolving line of credit	(16,000)	(101,000)	0
Deferred financing costs	(30)	(2,056)	0
Payments of earn-out	0	(237)	(8,736)
Payment for employee share-based compensation payroll taxes	(21,490)	(21,507)	(18,539)
Proceeds from exercise of stock options	8,499	6,002	16,275
Repurchase of common stock	(71,433)	(70,219)	(116,210)
Contributions from Noncontrolling Interest	0	251	0
Net cash used in financing activities	(100,454)	(103,078)	(143,148)
Net (decrease) increase in cash and cash equivalents	(24,433)	(18,796)	4,197
Cash and cash equivalents at beginning of period	293,324	312,120	307,923
Cash and cash equivalents at end of period	268,891	293,324	312,120
Supplemental disclosure of cash flow information
Interest paid	4,880	7,906	8,588
Income taxes paid	8,406	11,157	7,740
Non-cash items
Capital expenditures in accounts payable	2,862	4,247	2,024
Conversion of note into equity	$ 0	$ 0	$ 500