Organization and Significant Accounting Policies Other (Details) - shares	3 Months Ended		9 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 28, 2017	Jan. 30, 2016
Denominator for basic (loss) earnings per share:
Weighted average common shares outstanding, excluding unvested restricted stock (in shares)	23,082,974	22,890,484	23,029,546	22,941,354
Dilutive effect of employee stock options and unvested restricted stock (in shares)	0	193,332	0	198,627
Denominator for diluted (loss) earnings per share (in shares)	23,082,974	23,083,816	23,029,546	23,139,981
Number of shares reserved for issuance that are anti-dilutive	222,071	9,000	246,903	40,000