Accounts Receivable, Contract Assets, and Contract Liabilities - Change in Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 24, 2020	Oct. 26, 2019	Oct. 24, 2020	Oct. 26, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts at beginning of period	$ 1,605	$ 924	$ 4,582	$ 17,702
Provision for bad debt (recovery)	117	3,498	353	(7,015)
Amounts recovered (charged) against the allowance	29	135	(3,655)	(6,130)
Allowance for doubtful accounts at end of period	1,751	4,557	1,751	4,557
Cumulative Effect, Period Of Adoption, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts at beginning of period			471
Allowance for doubtful accounts at end of period	$ 0	$ 0	0	$ 0
Windstream Corporation
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts at beginning of period			$ 16,800