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Income Taxes - Uncertainty in Income Taxes - Narrative (Detail) - USD ($)	Feb. 02, 2020	Apr. 28, 2019	Jan. 27, 2019
Income Taxes [Line Items]
Unrecognized tax benefits	$ 914,000	$ 903,000	$ 880,000
Unrecognized tax benefits that would favorably impact effective income tax rate if recognized	914,000	523,000	500,000
Non-current Deferred Income Taxes [Member]
Income Taxes [Line Items]
Unrecognized tax benefits		380,000	380,000
Income Taxes Payable - Long-Term [Member]
Income Taxes [Line Items]
Unrecognized tax benefits	$ 914,000	$ 523,000	$ 500,000

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Income Taxes [Line Items]

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Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 10B
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-Section 50
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