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Stock-Based Compensation and Shares Repurchases - Narrative (Details) - USD ($)	9 Months Ended
	May 31, 2019	May 31, 2018	Jun. 30, 2018
2018 Share Repurchase Program
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]
Share repurchase program, amount authorized (up to)			$ 350,000,000
Time-based restricted stock units
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]
Award vesting period	3 years
Restricted stock units awarded (in shares)	1,600,000	1,400,000
Performance-based restricted stock units
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]
Award vesting period	3 years
Restricted stock units awarded (in shares)	400,000	400,000
Performance-based restricted stock units \| Maximum
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]
Award vesting percentage	150.00%
Market based restricted stock units
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]
Award vesting period	3 years
Award vesting percentage	200.00%
Restricted stock units awarded (in shares)	400,000	400,000
Plan 2011
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]
Shares available for issuance under share based compensation plan	12,021,729