Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020
Cash flows from operating activities:
Net income (loss)	$ 146,436	$ (28,662)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Gain on business divestitures	(75,754)	(35)
(Gain) loss on extinguishment of debt	3,411	(293)
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	0	11,249
Gain from sale of property, plant and equipment	(54)	(4,328)
Depreciation and amortization	37,102	39,283
Share-based compensation expense	10,743	10,313
Non-cash inventory related charges	2,330	4,281
Deferred income taxes	3,801	(5,194)
Changes in accrued retiree medical benefits	(409)	757
Changes in other accrued liabilities	49	(601)
Changes in other assets	(941)	144
Amortization of cloud-based software implementation costs	1,157	830
Interest capitalized associated with cloud computing implementation	(133)	(95)
Amortization of debt discounts and issuance costs	542	892
Changes in assets and liabilities:
Customer advances	(3,402)	(988)
Accounts receivable	(65,538)	13,028
Inventories	(27,531)	(11,399)
Other current assets	(1,932)	2,241
Accounts payable	18,284	(3,475)
Deferred profit	2,751	4,170
Income taxes payable	16,188	(1,245)
Accrued compensation, warranty and other liabilities	3,107	(2,631)
Operating lease right-of-use assets	5,339	5,237
Current and long-term operating lease liabilities	(5,585)	(5,459)
Net cash provided by operating activities	69,961	28,020
Cash flows from investing activities:
Cash received from disposition of business, net of cash paid	120,886	2,975
Cash received from sale of property, plant and equipment	106	16,982
Purchases of short-term investments	(168,918)	0
Sales and maturities of short-term investments	113,567	0
Purchases of property, plant and equipment	(8,924)	(13,559)
Net cash provided by investing activities	56,717	6,398
Cash flows from financing activities:
Cash dividends paid	0	(4,971)
Repurchases of common stock, net	(5,808)	(220)
Proceeds from revolving line of credit and construction loans	1,279	5,878
Proceeds received from issuance of common stock, net of fees	223,119	0
Repayments of long-term debt	(205,879)	(20,246)
Net cash provided by (used in) financing activities	12,711	(19,559)
Effect of exchange rate changes on cash and cash equivalents	38	(863)
Net increase in cash and cash equivalents	139,427	13,996
Cash and cash equivalents at beginning of period	149,358	155,930
Cash and cash equivalents at end of period	288,785	169,926
Supplemental disclosure of cash flow information:
Cash paid for income taxes	6,067	5,122
Inventory capitalized as property, plant and equipment	1,511	827
Property, plant and equipment purchases included in accounts payable	634	1,635
Capitalized cloud computing service costs included in accounts payable	1,182	1,923
Cash paid for interest	$ 5,381	$ 13,615