Income Taxes - Narrative (Details) - USD ($) $ in Thousands	8 Months Ended	9 Months Ended	12 Months Ended
	Dec. 22, 2017	Jan. 26, 2019	May 02, 2020	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017
Operating Loss Carryforwards [Line Items]
Deferred tax assets, gross			$ 19,094	$ 15,808
Deferred tax asset valuation allowance			1,189	893
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations		$ 2,775	159	2,741
Deferred Other Tax Expense (Benefit)		$ 480
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%				30.40%	35.00%
Accrued interest or penalties			30	$ 26
International
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards			4,832
Deferred tax assets, gross			919
Ireland and Belgium [Domain]
Operating Loss Carryforwards [Line Items]
Deferred tax asset valuation allowance			$ 627