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Organization and Summary of Significant Accounting Policies - Schedule of Cumulative Translation Adjustments Included in Accumulated Other Comprehensive Income/(Loss) (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
[1]
Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent [Abstract]      
Ending balance $ (4.1)    
Period translation adjustments (3.1) $ 1.6 [1] $ 4.4
Ending balance $ (7.2) $ (4.1)  
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements of this report for additional information.