Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Narrative (Details)

v3.21.2
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
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