Leases - Schedule of Components of Lease Expense (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Nov. 30, 2019	Nov. 30, 2019
Leases [Abstract]
Operating lease expense	$ 2,880	$ 6,222
Amortization of leased assets	65	110
Interest on lease liabilities	9	19
Total financing lease expense	74	129
Short-term lease expense	590	996
Variable lease expense	150	304
Total lease expense	$ 3,694	$ 7,651