Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Narrative (Details)

v3.21.1
Revenue Recognition - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Revenue from Contract with Customer [Abstract]        
Deferred revenue, revenue recognized $ 15,200 $ 22,100 $ 29,100 $ 40,100
Cumulative catch-up adjustment to revenue from change in estimates $ 7,600 6,300 $ 16,000 7,700
Cumulative catch-up adjustment to diluted earnings per share from change in estimates (in dollars per share) $ 0.09   $ 0.19  
Deferred contract cost capitalization $ 11,123 2,666 $ 13,614 3,995
Deferred contract cost amortization $ 2,143 $ 1,321 $ 4,430 $ 3,497