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Revenue - Reconciliation of Deferred Revenue Balances (Detail) - USD ($)
$ in Millions
6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Revenue From Contract With Customer [Abstract]    
Deferred revenue - beginning balance $ 2.2 $ 2.6
Revenue recognized (1.1) (2.6)
Prepayments 2.5 2.4
Deferred revenue - Ending Balance $ 3.6 $ 2.4