Contractual interest rate for funds borrowed, under the debt agreement.

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Notes Payable and Long-Term Debt (Summary) (Details) - USD ($) $ in Thousands	Aug. 31, 2018	Feb. 28, 2018	Aug. 31, 2017	Aug. 31, 2016
Debt Instrument [Line Items]
Long-term debt	$ 2,518,699		$ 2,050,272
Less current installments of notes payable and long-term debt	25,197		444,255
Notes payable and long-term debt, less current installments	$ 2,493,502		1,606,017
Senior Notes \| 8.250% Senior Notes
Debt Instrument [Line Items]
Senior Notes, stated interest rate	8.25%	8.25%
Long-term debt	$ 0		399,506
Senior Notes \| 5.625% Senior Notes
Debt Instrument [Line Items]
Senior Notes, stated interest rate	5.625%
Long-term debt	$ 397,995		397,104
Senior Notes \| 4.700% Senior Notes
Debt Instrument [Line Items]
Senior Notes, stated interest rate	4.70%
Long-term debt	$ 497,350		496,696
Senior Notes \| 4.900% Senior Notes
Debt Instrument [Line Items]
Senior Notes, stated interest rate	4.90%
Long-term debt	$ 298,814		298,571
Senior Notes \| 3.950% Senior Notes
Debt Instrument [Line Items]
Senior Notes, stated interest rate	3.95%	3.95%		3.95%
Long-term debt	$ 494,208		0
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	0		0
Line of Credit \| Term Loan Facility
Debt Instrument [Line Items]
Long-term debt	$ 830,332		$ 458,395