Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2020	Oct. 26, 2019	Oct. 31, 2020	Oct. 26, 2019	May 02, 2020	Apr. 27, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 595,485	$ 772,228	$ 799,499	$ 1,091,885
Rental income	43,653	53,685	54,457	71,115
Contract with Customer, Asset, Net	0	0	0	0	$ 0
Contract with Customer, Liability, Current	32,844		32,844
Contract with Customer, Asset, Net	0	0	0	0	0
Deferred Revenue	32,844	48,994	32,844	48,994	$ 13,373	$ 20,418
Deferred Revenue, Additions			91,051	108,430
Contract with Customer, Liability, Revenue Recognized			(71,580)	(79,854)
Retail Segment [Member]
Disaggregation of Revenue [Line Items]
Revenues	576,514	741,769	735,290	1,016,425
Rental income	43,653	53,685	54,457	71,115
Retail Segment [Member] | Retail Product [Member]
Disaggregation of Revenue [Line Items]
Revenues	517,837	674,042	659,663	920,417
Retail Segment [Member] | Service and Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	15,024	14,042	21,170	24,893
Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenues	36,387	40,210	116,681	112,519
DSS [Member]
Disaggregation of Revenue [Line Items]
Revenues	5,947	5,215	11,819	10,589
Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ (23,363)	$ (14,966)	$ (64,291)	$ (47,648)