| Intangibles (Tables) | 9 Months Ended | |||||||||||||||||||||||||||||||||||
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| Jun. 30, 2020 | ||||||||||||||||||||||||||||||||||||
| Goodwill And Intangible Assets Disclosure [Abstract] | ||||||||||||||||||||||||||||||||||||
| Future Amortization Expense Related to Intangible Assets | The following table summarizes estimated future amortization expense related to intangible assets that have net balances as of June 30, 2020: 
 
 
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| X | ||||||||||
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- References No definition available. 
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| X | ||||||||||
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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