Income Taxes Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Apr. 28, 2018	Jan. 27, 2018	Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016	May 02, 2015
Current Federal Tax Expense (Benefit)			$ (8,089)	$ 14,872	$ 13,019
Current State and Local Tax Expense (Benefit)			2,410	1,819	1,783
Current Income Tax Expense (Benefit)			(5,679)	16,691	14,802
Deferred Federal Income Tax Expense (Benefit)			(13,250)	(9,238)	(9,922)
Deferred State and Local Income Tax Expense (Benefit)			(1,514)	(2,723)	(2,213)
Deferred Income Tax Expense (Benefit)			(14,764)	(11,961)	(12,135)
Income Tax Expense (Benefit)			$ (20,443)	$ 4,730	$ 2,667
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	33.90%	34.10%	35.00%	35.00%
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			(0.30%)	(5.80%)	(15.20%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent			0.00%	0.00%	50.60%
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Percent			(0.70%)	25.50%	31.10%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent			(34.20%)	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent			7.50%	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent			0.20%	(5.50%)	(5.40%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent			0.90%	(2.30%)	0.80%
Effective Income Tax Rate Reconciliation, Percent			7.50%	46.90%	96.90%
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals	$ 9,375		$ 9,375	$ 13,047
Deferred Tax Assets, Inventory	8,256		8,256	16,969
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	1,374		1,374	1,780
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Self Insurance	474		474	881
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent	1,095		1,095	1,826
Deferred Tax Assets, Property, Plant and Equipment	2,803		2,803	8,728
Deferred Tax Assets, Tax Credit Carryforwards, Other	220		220	206
Deferred Tax Assets, Goodwill and Intangible Assets	9,105		9,105	0
Deferred Tax Assets, Operating Loss Carryforwards	5,834		5,834	4,916
Deferred Tax Assets, Other	4,356		4,356	5,106
Deferred Tax Assets, Gross	42,892		42,892	53,459
Deferred Tax Assets, Valuation Allowance	(932)		(932)	(1,392)
Deferred Tax Assets, Net of Valuation Allowance	41,960		41,960	52,067
Deferred Tax Liabilities, Goodwill and Intangible Assets	(44,066)		(44,066)	(68,938)
Deferred Tax Liabilities, Gross	(44,066)		(44,066)	(68,938)
Deferred Tax Assets, Net	(2,106)		(2,106)	(16,871)
Unrecognized Tax Benefits	97		97	86	$ 21	$ 215
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions			25	40	21
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions			2	25	0
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities			0	0	0
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions			(16)	0	$ (215)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	5		5	$ 3
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense			2
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)			2,700
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards	99,604		99,604
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	$ 278		$ 278