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Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 25, 2020
Jan. 26, 2019
Jan. 25, 2020
Jan. 26, 2019
Apr. 27, 2019
Oct. 27, 2018
Apr. 28, 2018
Disaggregation of Revenue [Line Items]              
Revenues $ 502,292 $ 548,008 $ 1,594,177 $ 1,700,258      
Rental income 48,614 56,019 119,729 134,251      
Contract with Customer, Liability, Current 60,708   60,708        
Contract with Customer, Asset, Net 0   0   $ 0 $ 0  
Deferred Revenue 60,708 69,662 60,708 69,662 $ 20,418   $ 20,144
Deferred Revenue, Additions     170,375 189,832      
Contract with Customer, Liability, Revenue Recognized     (130,085) (140,314)      
Retail Segment [Member]              
Disaggregation of Revenue [Line Items]              
Revenues 457,988 498,146          
Rental income 48,614 56,019          
Retail Segment [Member] | Retail Product [Member]              
Disaggregation of Revenue [Line Items]              
Revenues 400,170 431,555          
Retail Segment [Member] | Service and Other [Member]              
Disaggregation of Revenue [Line Items]              
Revenues 9,204 10,572          
BNC [Member]              
Disaggregation of Revenue [Line Items]              
Revenues     1,474,413 1,569,137      
Rental income     119,729 134,251      
BNC [Member] | Retail Product [Member]              
Disaggregation of Revenue [Line Items]              
Revenues     1,320,587 1,396,940      
BNC [Member] | Service and Other [Member]              
Disaggregation of Revenue [Line Items]              
Revenues     34,097 37,946      
MBS [Member]              
Disaggregation of Revenue [Line Items]              
Revenues     179,515 209,282      
Wholesale [Member]              
Disaggregation of Revenue [Line Items]              
Revenues 66,996 78,508          
DSS [Member]              
Disaggregation of Revenue [Line Items]              
Revenues 6,435 5,237 17,024 15,848      
Intersegment Eliminations [Member]              
Disaggregation of Revenue [Line Items]              
Revenues $ (29,127) $ (33,883) $ (76,775) $ (94,009)