Leases - Assets and Liabilities of Lessee (Details) - USD ($) $ in Thousands		12 Months Ended
	Apr. 01, 2019	Apr. 30, 2020
Leases [Abstract]
Operating lease right-of-use assets		$ 21,143
Finance lease right-of-use assets		$ 14,583
Weighted-average remaining lease-term - finance lease		10 years 10 months 24 days
Weighted-average remaining lease-term - operating lease		20 years 4 months 24 days
Weighted-average discount rate - finance lease		5.34%
Weighted-average discount rate - operating lease		4.25%
Right-of-use assets obtained in exchange for new finance lease liabilities (in thousands)		$ 1,520
Right-of-use assets obtained in exchange for new operating lease liabilities (in thousands)	$ 22,635	$ 2,840