Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2017	Aug. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 30,317	$ 14,172
Income taxes	(57,971)	(53,622)
Net income	161,108	136,208
Reclassifications out of Accumulated Other Comprehensive Income (Loss) | Unrealized Income on Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income taxes	(106)	230
Net income	(172)	385
Reclassifications out of Accumulated Other Comprehensive Income (Loss) | Unrealized Income on Cash Flow Hedges | Interest Rate Locks
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (278)	$ 615