Schedule II - Valuation And Qualifying Accounts (Details) - Allowance for doubtful accounts and other sales allowances - USD ($)	12 Months Ended
	Jan. 31, 2021	Jan. 26, 2020	Jan. 27, 2019
Change in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 633,000	$ 774,000	$ 2,700,000
Additions	88,000	4,000	129,000
Deductions	0	(145,000)	(2,055,000)
Balance at End of Year	$ 721,000	$ 633,000	$ 774,000