Revenue Recognition - Additional Information (Detail) $ in Thousands	12 Months Ended
	May 31, 2019 USD ($)
Revenue Recognition [Line Items]
Returns and allowances increase (decrease)	$ 546
Returns and Allowances	$ 6,745
Minimum
Revenue Recognition [Line Items]
Period allowed for payment of dues to customers	30 days
Maximum
Revenue Recognition [Line Items]
Period allowed for payment of dues to customers	60 days