Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jan. 27, 2018	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate		21.00%
Blended tax rate			30.50%
Tax Cuts And Jobs Act Of 2017, provisional income tax benefit	$ (77,256)		$ 76,648,000
Tax Cuts And Jobs Act Of 2017, change in tax rate, deferred taxes, provisional income tax expense		$ 2,355,000	81,871,000
Tax Cuts And Jobs Act Of 2017, transition tax on unremitted foreign earnings		331,000	(4,006,000)
Tax Cuts And Jobs Act of 2017, withholding tax on distributions			1,217,000
Tax Credit Carryforward [Line Items]
Foreign net operating loss carryforwards		11,237,000
Gross unrecognized tax benefits		13,035,000	14,227,000	$ 14,211,000
Deferred tax assets, deductibility of gross liabilities		2,225,000	2,418,000
Interest and penalties		1,926,000	$ 1,764,000
Increase in interest and penalties expense		$ 429,000
Foreign Tax Credit Carryforward
Tax Credit Carryforward [Line Items]
Expiration period		7 years
Capital Loss Carryforward
Tax Credit Carryforward [Line Items]
Expiration period		5 years