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Notes Payable, Net - Notes Payable, Net (Detail) - USD ($) $ in Thousands	Aug. 31, 2021	Aug. 31, 2020
Debt Instrument [Line Items]
Term loans	$ 492,319	$ 498,858
Other notes payable	1,710	10,135
Notes payable, gross	915,525	833,993
Debt discount and issuance costs	(89,019)	(29,905)
Notes payable, net	826,506	804,088
2.875% Convertible senior notes, due 2028
Debt Instrument [Line Items]
Convertible senior notes	373,750
2.875% Convertible senior notes, due 2024
Debt Instrument [Line Items]
Convertible senior notes	$ 47,746	275,000
2.25% Convertible senior notes, due 2024
Debt Instrument [Line Items]
Convertible senior notes		$ 50,000

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