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Organization and Significant Accounting Policies - Government Contracts (Details) - shares
3 Months Ended
Aug. 01, 2020
Jul. 27, 2019
Denominator for basic earnings per share:    
Weighted average common shares 23,893,001 23,745,199
Dilutive effect of employee stock options, restricted stock and restricted stock units 293,227 324,734
Denominator for diluted earnings per share 24,186,228 24,069,933
Number of anti-dilutive shares 844 3,675