Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016
Goodwill, Impairment Loss	$ 313,130
Depreciation	46,531	$ 41,224	$ 42,213
Property, Plant and Equipment, Gross	571,348	551,052
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	460,061	434,439
Property, Plant and Equipment, Net	111,287	116,613
Intangible Assets, Net (Excluding Goodwill)	219,129	209,885
Asset Impairment Charges	0	23	59
Other Nonrecurring Expense	313,130	0	11,987
Goodwill	49,282	329,467	280,911
Marketing and Advertising Expense	10,635	7,437	$ 8,614
Inventory, LIFO Reserve, Effect on Income, Net	40,425
Liabilities, Current	413,465	413,220
Prepaid Expenses and Other Current Assets [Member]
Restricted Cash and Cash Equivalents		1,996
Other Noncurrent Assets [Member]
Restricted Cash and Cash Equivalents	742	698
Deferred Tax Asset [Domain]
Liabilities, Current	13,369
BNC [Member]
Goodwill, Impairment Loss	$ 313,100
Largest Suppliers Percentage	41.00%
Goodwill	$ 0	281,349
DSS [Member]
Goodwill	$ 0
MBS [Member]
Largest Suppliers Percentage	40.00%
Goodwill	$ 49,282	48,118
Leasehold Improvements [Member]
Property, Plant and Equipment, Gross	148,413	144,260
Display fixtures and equipment [Member]
Property, Plant and Equipment, Gross	237,823	235,153
Software and Software Development Costs [Member]
Property, Plant and Equipment, Gross	123,575	100,749
Furniture and Fixtures [Member]
Property, Plant and Equipment, Gross	54,991	52,339
Construction in Progress [Member]
Property, Plant and Equipment, Gross	$ 6,546	$ 18,551
Minimum [Member] \| Leasehold Improvements [Member]
Property, Plant and Equipment, Useful Life	1 year
Minimum [Member] \| Display fixtures and equipment [Member]
Property, Plant and Equipment, Useful Life	3 years
Minimum [Member] \| Software and Software Development Costs [Member]
Property, Plant and Equipment, Useful Life	2 years
Minimum [Member] \| Furniture and Fixtures [Member]
Property, Plant and Equipment, Useful Life	2 years
Maximum [Member] \| Leasehold Improvements [Member]
Property, Plant and Equipment, Useful Life	15 years
Maximum [Member] \| Display fixtures and equipment [Member]
Property, Plant and Equipment, Useful Life	5 years
Maximum [Member] \| Software and Software Development Costs [Member]
Property, Plant and Equipment, Useful Life	5 years
Maximum [Member] \| Furniture and Fixtures [Member]
Property, Plant and Equipment, Useful Life	7 years

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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