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Revenue Recognition - Narrative (Details)
$ in Millions
3 Months Ended
Dec. 31, 2018
USD ($)
Revenue from Contract with Customer [Abstract]  
Deferred revenue, revenue recognized $ 21.8
Cumulative catch-up adjustment to revenue from change in estimates (1.5)
Deferred contract costs 3.1
Amortization of deferred contract costs $ 1.3