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Fair Value Measurements - Hierarchy and Transfers (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jul. 27, 2019	Apr. 27, 2019
Assets
Total assets	$ 62,458	$ 57,421
Liabilities
Contingent consideration liability	7,900
Recurring basis
Liabilities
Transfers from Level 1 to Level 2 assets	0	0
Transfers from Level 2 to Level 1 assets	0	0
Transfers from Level 1 to Level 2 liabilities	0	0
Transfers from Level 2 to Level 1 liabilities	0	0
Transfers into Level 3 assets	0	0
Transfers out of Level 3 assets	0	0
Transfers into Level 3 liabilities	0	0
Transfers out of Level 3 liabilities	0	0
Recurring basis | Level 1
Assets
Marketable securities	10	5
Held-to-maturity investments	3,454	3,341
Total assets	3,464	3,346
Recurring basis | Level 2
Assets
Marketable securities	35,627	34,390
Total assets	35,627	34,390
Recurring basis | Level 3
Assets
Cost basis investments	11,979	11,979
Total assets	11,979	11,979
Liabilities
Contingent consideration liability	$ 7,900	$ 7,900

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