Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	Feb. 28, 2017	Feb. 29, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ (17,286)	$ (36,412)	$ (24,874)	$ (17,680)	$ (20,004)	$ (8,471)	$ (24,874)	$ (8,471)
Other comprehensive income (loss) before reclassifications	4,960	18,741	(11,923)	(16,482)	(4,636)	(12,021)
Amounts reclassified from accumulated other comprehensive income (loss)	385	385	385	488	6,960	488
Other comprehensive income (loss)	5,345	19,126	(11,538)	(15,994)	2,324	(11,533)	12,933	(25,203)
Ending Balance	(11,941)	(17,286)	(36,412)	(33,674)	(17,680)	(20,004)	(11,941)	(33,674)
Foreign Currency
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(10,009)	(2,359)	(2,474)	(7,180)	(9,026)	2,987	(2,474)	2,987
Other comprehensive income (loss) before reclassifications	2,400	(7,650)	115	(2,405)	(4,626)	(12,013)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0	0	6,472	0
Other comprehensive income (loss)	2,400	(7,650)	115	(2,405)	1,846	(12,013)
Ending Balance	(7,609)	(10,009)	(2,359)	(9,585)	(7,180)	(9,026)	(7,609)	(9,585)
Unrealized Loss on Derivatives
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(5,707)	(32,482)	(20,830)	(9,650)	(10,138)	(10,626)	(20,830)	(10,626)
Other comprehensive income (loss) before reclassifications	2,560	26,390	(12,037)	(14,070)	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	385	385	385	488	488	488
Other comprehensive income (loss)	2,945	26,775	(11,652)	(13,582)	488	488
Ending Balance	(2,762)	(5,707)	(32,482)	(23,232)	(9,650)	(10,138)	(2,762)	(23,232)
Other
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(1,570)	(1,571)	(1,570)	(850)	(840)	(832)	(1,570)	(832)
Other comprehensive income (loss) before reclassifications	0	1	(1)	(7)	(10)	(8)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0	0	0	0
Other comprehensive income (loss)	0	1	(1)	(7)	(10)	(8)
Ending Balance	$ (1,570)	$ (1,570)	$ (1,571)	$ (857)	$ (850)	$ (840)	$ (1,570)	$ (857)