Income Taxes Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Apr. 28, 2018	Jan. 27, 2018	May 02, 2020	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017
Current Federal Tax Expense (Benefit)			$ (5,471)	$ (6,494)	$ (8,089)
Current State and Local Tax Expense (Benefit)			(1,127)	(2,035)	2,410
Current Income Tax Expense (Benefit)			(6,598)	(8,529)	(5,679)
Deferred Federal Income Tax Expense (Benefit)			(4,086)	(3,681)	(13,250)
Deferred State and Local Income Tax Expense (Benefit)			(1,294)	(850)	(1,514)
Deferred Income Tax Expense (Benefit)			(5,380)	(4,531)	(14,764)
Income Tax Expense (Benefit)			$ (11,978)	$ (13,060)	$ (20,443)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	33.90%	21.00%	21.00%	34.10%	35.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount				$ 3,911
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability					$ 20,425
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent			3.70%	6.30%	(0.30%)
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Percent			(2.90%)	(3.90%)	(0.70%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent			0.00%	0.00%	(34.20%)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent			0.00%	10.40%	7.50%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent			0.50%	0.30%	0.20%
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent			1.50%	0.80%	0.90%
Effective Income Tax Rate Reconciliation, Percent			23.80%	34.90%	7.50%
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals			$ 11,046	$ 10,972
Deferred Tax Assets, Inventory			7,167	2,969
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost			1,511	1,738
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Self Insurance			528	518
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent			65,334	982
Deferred Tax Assets, Tax Credit Carryforwards, Other			484	402
Deferred Tax Assets, Goodwill and Intangible Assets			18,438	19,903
Deferred Tax Assets, Operating Loss Carryforwards			4,992	4,928
Deferred Tax Assets, Other			8,853	8,253
Deferred Tax Assets, Gross			118,353	50,665
Deferred Tax Assets, Valuation Allowance			(1,231)	(1,194)
Deferred Tax Assets, Net of Valuation Allowance			117,122	49,471
Deferred Tax Liabilities, Goodwill and Intangible Assets			(37,864)	(40,790)
Deferred Tax Liabilities, Leasing Arrangements			(64,695)	0
Deferred Tax Liabilities, Property, Plant and Equipment			(6,758)	(6,256)
Deferred Tax Liabilities, Gross			(109,317)	(47,046)
Deferred Tax Assets, Net			7,805	2,425
Unrecognized Tax Benefits	$ 97		52	91	$ 97	$ 86
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions			0	0	25
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions			0	0	2
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities			0	0	0
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions			(39)	(6)	$ (16)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued			3	$ 4
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense			1
Deferred Tax Liabilities, Undistributed Foreign Earnings			200
Deferred Foreign Income Tax Expense (Benefit)			100
One percentage point [Domain]
Current State and Local Tax Expense (Benefit)			502
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards			83,999
State and Local Jurisdiction [Member]
Operating Loss Carryforwards			$ 612