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Goodwill and Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
May 31, 2021
May 31, 2020
May 31, 2021
May 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization of intangible assets $ 10.2 $ 10.8 $ 30.4 $ 30.8
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]        
Amortization expense in fiscal 2021 40.7   40.7  
Amortization expense in fiscal 2022 40.6   40.6  
Amortization expense in fiscal 2023 40.3   40.3  
Amortization expense in fiscal 2024 40.1   40.1  
Amortization expense in fiscal 2025 $ 33.3   $ 33.3