Fair Value Measurements - Hierarchy and Transfers (Details) - USD ($) $ in Thousands	Apr. 30, 2022	Apr. 24, 2021
Assets
Total assets	$ 51,537	$ 55,404
Recurring basis
Assets
Marketable securities	42,621	45,293
Held-to-maturity investments	1,337	2,532
Cost basis investments	7,579	7,579
Total assets	51,537	55,404
Liabilities
Contingent consideration liability	800	14,100
Recurring basis | Level 1
Assets
Marketable securities	0	119
Held-to-maturity investments	1,337	2,532
Cost basis investments	0	0
Total assets	1,337	2,651
Liabilities
Contingent consideration liability	0	0
Recurring basis | Level 2
Assets
Marketable securities	33,578	37,572
Held-to-maturity investments	0	0
Cost basis investments	0	0
Total assets	33,578	37,572
Liabilities
Contingent consideration liability	0	0
Recurring basis | Level 3
Assets
Marketable securities	2,500	0
Held-to-maturity investments	0	0
Cost basis investments	7,579	7,579
Total assets	10,079	7,579
Liabilities
Contingent consideration liability	800	14,100
Recurring basis | NAV
Assets
Marketable securities	6,543	7,602
Held-to-maturity investments	0	0
Cost basis investments	0	0
Total assets	6,543	7,602
Liabilities
Contingent consideration liability	$ 0	$ 0