Equity and Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended									12 Months Ended
	Apr. 28, 2018	Jan. 27, 2018	Oct. 28, 2017	Jul. 29, 2017	Apr. 29, 2017	Jan. 28, 2017	Oct. 29, 2016	Jul. 30, 2016	Oct. 31, 2015	Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016	Dec. 14, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount										2,494,799	375,457	411,274
Common Stock, Shares Authorized	200,000,000				200,000,000					200,000,000	200,000,000
Common Stock, Par or Stated Value Per Share	$ 0.01				$ 0.01					$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	5,000,000				5,000,000					5,000,000	5,000,000
Preferred Stock, Par or Stated Value Per Share	$ 0.01				$ 0.01					$ 0.01	$ 0.01
Common Stock, Shares, Outstanding	46,916,616				46,517,000					46,916,616	46,517,000
Preferred Stock, Shares Outstanding	0				0					0	0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized									2,409,345		4,000,000	2,409,345
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized					6,409,345						6,409,345
Stock Repurchase Program, Authorized Amount													$ 50,000
Stock Repurchased During Period, Shares											688,948,000	1,715,269,000
Stock Repurchased During Period, Value											$ 6,718
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 26,669									$ 26,669
Treasury Stock Acquired, Average Cost Per Share											$ 10.10	$ 9.95
Shares Paid for Tax Withholding for Share Based Compensation										260,531	276,292	174,511
Net Income (Loss) Attributable to Parent	$ 17,057	$ (283,235)	$ 48,395	$ (34,783)	$ 227	$ 3,761	$ 29,289	$ (27,916)		$ (252,566)	$ 5,361	$ 84
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic										0	(3)	0
Net Income (Loss) Available to Common Stockholders, Basic										(252,566)	5,358	84
Undistributed Earnings, Basic										0	3	0
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted										0	(3)	0
Net Income (Loss) Available to Common Stockholders, Diluted										$ (252,566)	$ 5,358	$ 84
Weighted Average Number of Shares Outstanding, Basic										46,763,000	46,317,000	46,238,000
Average dilutive restricted stock units										0	389,000	227,000
Average dilutive performance shares										0	40,000	0
Average dilutive restricted shares										0	17,000	0
Average Dilutive Options										0	0	14,000
Average Dilutive Performance Share Units										0	0	0
Weighted Average Number of Shares Outstanding, Diluted										46,763,000	46,763,000	46,479,000
Earnings Per Share, Basic	$ 0.36	$ (6.04)	$ 1.04	$ (0.75)	$ 0.00	$ 0.08	$ 0.63	$ (0.60)		$ (5.40)	$ 0.12	$ 0.00
Earnings Per Share, Diluted	$ 0.36	$ (6.04)	$ 1.03	$ (0.75)	$ 0.00	$ 0.08	$ 0.63	$ (0.60)		$ (5.40)	$ 0.11	$ 0.00
Treasury Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock Repurchased During Period, Shares											689,000
Stock Repurchased During Period, Value											$ 6,718	$ 16,612
Shares Paid for Tax Withholding for Share Based Compensation										260,000	276,000