Repurchase of Common Stock - Additional Information (Detail) - USD ($)	6 Months Ended
	Nov. 30, 2015	Jun. 23, 2014
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount	$ 0
Remaining stock available to repurchase	$ 15,500,000
Maximum [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount		$ 50,000,000
Stock repurchases leverage ratio	250.00%