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Leases - Supplemental lease information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Oct. 31, 2020	Oct. 26, 2019
Leases
Cash paid for amounts included in the measurement of operating lease liabilities	$ 2,727	$ 2,733
Right-of-use assets obtained in exchange for new lease liabilities	$ 5,757	$ 10,941
Weighted average remaining lease term	44 months	36 months
Weighted average discount rate	3.40%	3.70%

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- References

No definition available.

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- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 5
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- Definition

Weighted average discount rate for operating lease calculated at point in time.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
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- Definition

Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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-Name Accounting Standards Codification
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