Fair Value Measurements - Hierarchy and Transfers (Details) - USD ($) $ in Thousands	Jan. 28, 2023	Apr. 30, 2022
Assets
Total assets	$ 39,650	$ 51,537
Recurring basis
Assets
Marketable securities	30,667	42,621
Held-to-maturity investments	1,404	1,337
Cost basis investments	7,579	7,579
Total assets	39,650	51,537
Liabilities
Contingent consideration liability		800
Recurring basis | Level 1
Assets
Marketable securities	0	0
Held-to-maturity investments	1,404	1,337
Cost basis investments	0	0
Total assets	1,404	1,337
Liabilities
Contingent consideration liability		0
Recurring basis | Level 2
Assets
Marketable securities	21,044	33,578
Held-to-maturity investments	0	0
Cost basis investments	0	0
Total assets	21,044	33,578
Liabilities
Contingent consideration liability		0
Recurring basis | Level 3
Assets
Marketable securities	2,737	2,500
Held-to-maturity investments	0	0
Cost basis investments	7,579	7,579
Total assets	10,316	10,079
Liabilities
Contingent consideration liability		800
Recurring basis | NAV
Assets
Marketable securities	6,886	6,543
Held-to-maturity investments	0	0
Cost basis investments	0	0
Total assets	$ 6,886	6,543
Liabilities
Contingent consideration liability		$ 0