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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jan. 26, 2019	Apr. 27, 2019	Apr. 28, 2018
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		$ 159
Reconciliation of Changes in Unrecognized Tax Benefits
Unrecognized tax benefits, beginning balance	$ 3,178	3,178	$ 3,113
Gross increases related to prior period tax positions		13	82
Gross decreases related to prior period tax positions		18	30
Gross increases related to current period tax positions		146	152
Lapse of statute of limitations	$ (2,775)	(2,741)	(139)
Unrecognized tax benefits, ending balance		$ 578	$ 3,178

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of unrecognized tax benefits.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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