Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2017	Aug. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 2,302,793
Other comprehensive income (loss)	35,032	$ (11,538)
Ending balance	2,565,881
Foreign Currency
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(12,726)	(2,474)
Other comprehensive income before reclassifications	35,184	115
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Other comprehensive income (loss)	35,184	115
Ending balance	22,458	(2,359)
Unrealized Income on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	11,382	(20,830)
Other comprehensive income before reclassifications	0	(12,037)
Amounts reclassified from accumulated other comprehensive income (loss)	(172)	385
Other comprehensive income (loss)	(172)	(11,652)
Ending balance	11,210	(32,482)
Other
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(1,685)	(1,570)
Other comprehensive income before reclassifications	20	(1)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Other comprehensive income (loss)	20	(1)
Ending balance	(1,665)	(1,571)
Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(3,029)	(24,874)
Other comprehensive income before reclassifications	35,204	(11,923)
Amounts reclassified from accumulated other comprehensive income (loss)	(172)	385
Other comprehensive income (loss)	35,032	(11,538)
Ending balance	$ 32,003	$ (36,412)