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, 2019	Nov. 30, 2018	Aug. 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	Feb. 28, 2019	Feb. 28, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	$ 3,027,244	$ 3,345,968	$ 3,016,526	$ 2,553,033	$ 2,565,881	$ 2,302,793	$ 3,016,526	$ 2,302,793
Other comprehensive income (loss) before reclassifications	(3,158)	(5,702)	(6,187)	2,374	(11,394)	35,204
Amounts reclassified from accumulated other comprehensive income (loss)	(295)	(294)	(295)	(294)	(172)	(172)
Other comprehensive (loss) income	(3,453)	(5,996)	(6,482)	2,080	(11,566)	35,032	(15,931)	25,546
Balance	3,179,492	3,027,244	3,345,968	2,893,997	2,553,033	2,565,881	3,179,492	2,893,997
Foreign Currency
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(7,092)	3,531	6,550	11,084	22,458	(12,726)	6,550	(12,726)
Other comprehensive income (loss) before reclassifications	5,025	(10,623)	(3,019)	2,374	(11,374)	35,184
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0	0	0	0
Other comprehensive (loss) income	5,025	(10,623)	(3,019)	2,374	(11,374)	35,184
Balance	(2,067)	(7,092)	3,531	13,458	11,084	22,458	(2,067)	13,458
Unrealized Income on Interest Rate Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	11,613	6,986	10,449	11,038	11,210	11,382	10,449	11,382
Other comprehensive income (loss) before reclassifications	(8,183)	4,921	(3,168)	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	(295)	(294)	(295)	(294)	(172)	(172)
Other comprehensive (loss) income	(8,478)	4,627	(3,463)	(294)	(172)	(172)
Balance	3,135	11,613	6,986	10,744	11,038	11,210	3,135	10,744
Other
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(656)	(656)	(656)	(1,685)	(1,665)	(1,685)	(656)	(1,685)
Other comprehensive income (loss) before reclassifications	0	0	0	0	(20)	20
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0	0	0	0
Other comprehensive (loss) income	0	0	0	0	(20)	20
Balance	(656)	(656)	(656)	(1,685)	(1,685)	(1,665)	(656)	(1,685)
Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	3,865	9,861	16,343	20,437	32,003	(3,029)	16,343	(3,029)
Balance	$ 412	$ 3,865	$ 9,861	$ 22,517	$ 20,437	$ 32,003	$ 412	$ 22,517