Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	May 31, 2019	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2019	May 31, 2018	May 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense									$ 101,736	$ 110,175	$ 86,524
Tax expense									(219,764)	(57,069)	(230,118)
Amortization of interest rate locks, net of tax	$ 226,171	$ 200,923	$ 242,994	$ 212,547	$ 189,298	$ 295,789	$ 137,737	$ 161,108	882,635	783,932	$ 457,286
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax expense									(717)	(571)
Amortization of interest rate locks, net of tax									1,179	933
Interest Rate Contract | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense									$ 1,896	$ 1,504