Revenue Recognition - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2021 |
Jun. 30, 2020 |
Jun. 30, 2021 |
Jun. 30, 2020 |
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| Revenue from Contract with Customer [Abstract] | ||||
| Deferred revenue, revenue recognized | $ 7.5 | $ 9.1 | $ 36.7 | $ 49.2 |
| Cumulative catch-up adjustment to revenue from change in estimates | $ 1.8 | $ (1.4) | $ 17.8 | $ (9.1) |
| Cumulative catch-up adjustment to diluted earnings per share from change in estimates (in dollars per share) | $ 0.03 | $ 0.20 | ||
| X | ||||||||||
- Definition Contract with Customer, Asset, Cumulative Catch-Up Adjustment To Revenue, Change In Estimate Of Transaction Price, Effect Of Change On Diluted Earnings Per Share No definition available.
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| X | ||||||||||
- Definition Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in estimate of transaction price which increases (decreases) right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. Includes, but is not limited to, change in assessment of whether estimate of variable consideration is constrained. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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