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Organization and Significant Accounting Policies - Government Contracts (Details) - shares	3 Months Ended		9 Months Ended
	Jan. 30, 2021	Jan. 25, 2020	Jan. 30, 2021	Jan. 25, 2020
Denominator for basic earnings per share:
Weighted average common shares	23,942,782	23,821,145	23,924,017	23,790,788
Dilutive effect of employee stock options, restricted stock and restricted stock units	318,092		292,354	285,407
Denominator for diluted earnings per share	24,260,874	23,821,145	24,216,371	24,076,195
Number of anti-dilutive shares	0	287,408	24	3,076

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 22
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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

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