Segment Reporting Segment Reporting (Details) $ in Thousands	3 Months Ended	9 Months Ended
Jan. 26, 2019 USD ($) Store	Jan. 27, 2018 USD ($)	Jan. 26, 2019 USD ($) Store	Jan. 27, 2018 USD ($)
Segment Reporting Information [Line Items]
Restructuring and other charges	$ 2,500	$ 0	$ 2,500	$ 5,429
Goodwill, Impairment Loss		313,130	0
Revenues	$ 550,330	603,391	$ 1,702,580	$ 1,845,963
Number of Reportable Segments			3	2
Number of Stores \| Store	1,453		1,453
Deferred Compensation Arrangement with Individual, Compensation Expense				$ 5,361
Gross Profit	$ 132,953	146,999	$ 410,323	428,899
Depreciation and amortization expense	16,374	17,007	49,333	48,728
Operating Income (Loss)	3,021	(295,625)	32,428	(267,908)
Interest Income (Expense), Net	(2,546)	(2,954)	(7,904)	(7,828)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	475	(298,579)	24,524	(275,736)
BNC [Member]
Segment Reporting Information [Line Items]
Revenues	461,067	500,888	1,409,112	1,508,166
Gross Profit	99,946	112,380	311,344	329,127
Depreciation and amortization expense	12,696	13,532	38,848	40,196
Operating Income (Loss)	(5,037)	(306,189)	7,569	(292,328)
MBS [Member]
Segment Reporting Information [Line Items]
Revenues	116,431	138,927	365,709	413,579
Gross Profit	29,037	34,949	86,681	95,713
Depreciation and amortization expense	1,569	1,596	4,668	4,849
Operating Income (Loss)	15,962	20,848	46,314	52,954
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization expense	37	45	119	140
Operating Income (Loss)	(6,234)	(5,690)	(17,862)	(22,358)
DSS [Member]
Segment Reporting Information [Line Items]
Revenues	5,237	5,572	15,848	10,058
Gross Profit	4,969	5,497	15,312	9,841
Depreciation and amortization expense	2,072	1,834	5,698	3,543
Operating Income (Loss)	(678)	1,233	(627)	(394)
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(32,405)	(41,996)	(88,089)	(85,840)
Gross Profit	(999)	(5,827)	(3,014)	(5,782)
Operating Income (Loss)	$ (992)	$ (5,827)	$ (2,966)	$ (5,782)
BNC [Member]
Segment Reporting Information [Line Items]
Number of Stores \| Store	773		773
MBS [Member]
Segment Reporting Information [Line Items]
Number of Stores \| Store	680		680
Number of Wholesale Customers \| Store			3,500
Number of System Customers \| Store	400		400

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