Accumulated Other Comprehensive Income - Summary of Changes in Accumulated Other Comprehensive Income (Loss) Included Within Shareholders' Equity (Detail) - USD ($) $ in Thousands	6 Months Ended
	Nov. 30, 2015	Nov. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	$ (13,538)	$ (2,679)
Other comprehensive income (loss) before tax	(4,113)	(4,723)
Non-controlling interest		37
Balance, end of period	(17,651)	(7,365)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(20,896)	(5,145)
Other comprehensive income (loss) before tax	(6,020)	(6,939)
Non-controlling interest		37
Balance, end of period	(26,916)	(12,047)
Foreign Currency Hedge [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	4,466	1,229
Other comprehensive income (loss) before tax	505	1,439
Balance, end of period	4,971	2,668
Tax Provision [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	2,892	1,237
Other comprehensive income (loss) before tax	1,402	777
Balance, end of period	$ 4,294	$ 2,014