Consolidated Statements of Comprehensive Income - Unaudited - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Statement of Comprehensive Income [Abstract]
Net income		$ 88,686	$ 84,702	$ 182,643	$ 168,998
Other comprehensive (loss) income, net of tax
Net unrealized gain on cash flow hedges	[1]	(208)	527	1,843	1,565
Foreign currency translation adjustments		(1,565)	5,026	6,222	(4,478)
Other comprehensive (loss) income		(1,773)	5,553	8,065	(2,913)
Comprehensive income		86,913	90,255	190,708	166,085
Unrealized gain (loss) on derivatives arising during period net of tax		$ (73)	$ 179
Other comprehensive income (loss), cash flow hedge, gain (loss), after reclassification, tax				$ 641	$ 767

[1] For the three and six months ended February 29, 2020, the unrealized (loss) gain on cash flow hedges were net of a tax benefit of $73 thousand and a tax expense of $641 thousand, respectively. For the three and six months ended February 28, 2019, the unrealized gain on cash flow hedges was net of a tax expense of $179 thousand and $767 thousand, respectively.