Changes in Accrued Warranty Balances (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Feb. 28, 2022	Feb. 28, 2021	Feb. 28, 2022	Feb. 28, 2021
Commitments and Contingencies Disclosure [Abstract]
Beginning Balance		$ 12,886	$ 12,050	$ 13,175	$ 11,106
Deductions	[1]	(5,186)	(4,745)	(16,868)	(18,327)
Provision charged to expense		4,628	5,473	16,021	19,999
Ending Balance		$ 12,328	$ 12,778	$ 12,328	$ 12,778

[1] Primarily claims paid during the year.