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, 2018	Nov. 30, 2017	Aug. 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	Feb. 28, 2018	Feb. 28, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			$ 2,302,793				$ 2,302,793
Other comprehensive (loss) income before reclassifications	$ 2,374	$ (11,394)	35,204	$ 4,960	$ 18,741	$ (11,923)
Amounts reclassified from accumulated other comprehensive income (loss)	(294)	(172)	(172)	385	385	385
Other comprehensive income	2,080	(11,566)	35,032	5,345	19,126	(11,538)	25,546	$ 12,933
Ending balance	2,893,997						2,893,997
Foreign Currency
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	11,084	22,458	(12,726)	(10,009)	(2,359)	(2,474)	(12,726)	(2,474)
Other comprehensive (loss) income before reclassifications	2,374	(11,374)	35,184	2,400	(7,650)	115
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0	0	0	0
Other comprehensive income	2,374	(11,374)	35,184	2,400	(7,650)	115
Ending balance	13,458	11,084	22,458	(7,609)	(10,009)	(2,359)	13,458	(7,609)
Unrealized Income on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	11,038	11,210	11,382	(5,707)	(32,482)	(20,830)	11,382	(20,830)
Other comprehensive (loss) income before reclassifications	0	0	0	2,560	26,390	(12,037)
Amounts reclassified from accumulated other comprehensive income (loss)	(294)	(172)	(172)	385	385	385
Other comprehensive income	(294)	(172)	(172)	2,945	26,775	(11,652)
Ending balance	10,744	11,038	11,210	(2,762)	(5,707)	(32,482)	10,744	(2,762)
Other
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(1,685)	(1,665)	(1,685)	(1,570)	(1,571)	(1,570)	(1,685)	(1,570)
Other comprehensive (loss) income before reclassifications	0	(20)	20	0	1	(1)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0	0	0	0
Other comprehensive income	0	(20)	20	0	1	(1)
Ending balance	(1,685)	(1,685)	(1,665)	(1,570)	(1,570)	(1,571)	(1,685)	(1,570)
Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	20,437	32,003	(3,029)	(17,286)	(36,412)	(24,874)	(3,029)	(24,874)
Ending balance	$ 22,517	$ 20,437	$ 32,003	$ (11,941)	$ (17,286)	$ (36,412)	$ 22,517	$ (11,941)