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Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 26, 2019
Jan. 27, 2018
Jan. 26, 2019
Jan. 27, 2018
Apr. 28, 2018
Disaggregation of Revenue [Line Items]          
Prior Period Reclassification Adjustment       $ 14,080 $ 2,610
Revenues $ 550,330 $ 603,391 $ 1,702,580 1,845,963  
Rental income 56,019 60,662 134,251 148,194  
Contract with Customer, Liability, Current 69,546   69,546    
Contract with Customer, Asset, Net 0 0 0 0  
Deferred Revenue 69,662 74,524 69,662 74,524 $ 20,144
Deferred Revenue, Additions     189,832    
Contract with Customer, Liability, Revenue Recognized     (140,314)    
BNC [Member]          
Disaggregation of Revenue [Line Items]          
Revenues 461,067 500,888 1,409,112 1,508,166  
Rental income 54,894 58,992 131,058 143,915  
BNC [Member] | Retail Product [Member]          
Disaggregation of Revenue [Line Items]          
Revenues 397,552 432,356 1,249,284 1,334,881  
BNC [Member] | Service and Other [Member]          
Disaggregation of Revenue [Line Items]          
Revenues 8,621 9,540 28,770 29,370  
MBS [Member]          
Disaggregation of Revenue [Line Items]          
Revenues 116,431 138,927 365,709 413,579  
Rental income 1,125 1,670 3,193 4,279  
MBS [Member] | Retail Product [Member]          
Disaggregation of Revenue [Line Items]          
Revenues 38,285 45,128 159,180 177,126  
MBS [Member] | Wholesale Product [Member]          
Disaggregation of Revenue [Line Items]          
Revenues 77,021 92,129 203,336 232,174  
DSS [Member]          
Disaggregation of Revenue [Line Items]          
Revenues 5,237 5,572 15,848 10,058  
Intersegment Eliminations [Member]          
Disaggregation of Revenue [Line Items]          
Revenues $ (32,405) $ (41,996) $ (88,089) $ (85,840)