Organization and Significant Accounting Policies Other (Details) - shares	3 Months Ended		6 Months Ended
	Oct. 28, 2017	Oct. 29, 2016	Oct. 28, 2017	Oct. 29, 2016
Denominator for basic earnings per share:
Weighted average common shares (in shares)	23,477,914	23,049,056	23,407,500	23,002,832
Dilutive effect of employee stock options, restricted stock and restricted stock units (in shares)	355,045	0	308,497	0
Denominator for diluted earnings per share (in shares)	23,832,959	23,049,056	23,715,997	23,002,832
Number of shares reserved for issuance that are anti-dilutive	0	199,428	14,820	256,366