Segment Reporting Segment Reporting (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 29, 2017 USD ($) Store	Jan. 28, 2017 USD ($)	Oct. 29, 2016 USD ($)	Jul. 30, 2016 USD ($)	Apr. 30, 2016 USD ($)	Jan. 30, 2016 USD ($)	Oct. 31, 2015 USD ($)	Aug. 01, 2015 USD ($)	Apr. 29, 2017 USD ($) Store	Apr. 30, 2016 USD ($)	May 02, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments									2
Number of Stores | Store	1,481								1,481
Revenue, Net	$ 342,830	$ 521,624	$ 770,671	$ 239,237	$ 294,759	$ 518,423	$ 755,864	$ 238,983	$ 1,874,362	$ 1,808,029	$ 1,772,998
Gross Profit	122,511	$ 115,925	$ 171,514	$ 47,413	106,044	$ 120,640	$ 175,121	$ 51,544	457,363	453,349	443,573
Depreciation and amortization expense									53,318	52,690	50,509
Operating Income (Loss)									13,555	4,623	33,560
Interest Income (Expense), Net									(3,464)	(1,872)	(210)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest									10,091	2,751	33,350
Assets	1,299,832				1,071,683				1,299,832	1,071,683
Payments to Acquire Property, Plant, and Equipment									34,670	50,790	48,452
Goodwill	329,467				280,911				329,467	280,911	274,070
BNC [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Gross									1,845,561	1,808,029	1,772,998
Gross Profit									453,252	453,349	443,573
Depreciation and amortization expense									52,259	52,690	50,509
Operating Income (Loss)									18,820	4,623	33,560
Assets	1,049,441				1,071,683				1,049,441	1,071,683
Payments to Acquire Property, Plant, and Equipment									(34,452)	(50,790)	48,452
Goodwill	281,349				280,911				281,349	280,911
MBS [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Gross									34,091	0	0
Gross Profit									4,748	0	0
Depreciation and amortization expense									1,059	0	0
Operating Income (Loss)									(4,628)	0	0
Assets	250,391				0				250,391	0
Payments to Acquire Property, Plant, and Equipment									(218)	0	0
Goodwill	$ 48,118				$ 0				48,118	0
Eliminations [Member]
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Gross									(5,290)	0	0
Gross Profit									(637)	0	0
Operating Income (Loss)									$ (637)	$ 0	$ 0
BNC [Member]
Segment Reporting Information [Line Items]
Number of Stores | Store	769								769
MBS [Member]
Segment Reporting Information [Line Items]
Number of Stores | Store	712								712
Number of Wholesale Customers | Store									3,700