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Organization and Summary of Significant Accounting Policies - Reconciliation of Denominators of Basic and Diluted Earnings Per Share Computations (Detail) - shares
 3 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
 [1]
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Equity [Abstract]                      
Weighted-average shares outstanding used to compute basic EPS 74.6 74.5 74.4 73.7 73.4 73.3 74.2 73.0 74,300,000 73,500,000 69,400,000
Effect of dilutive stock options                   2,500,000 2,600,000
Weighted-average shares outstanding and dilutive securities used to compute diluted EPS 74.6 74.5 74.4 73.7 74.8 74.9 76.5 73.0 74,300,000 76,000,000.0 72,000,000.0
[1] An immaterial prior period goodwill impairment charge of $1.3 million was previously classified as part of selling, general and administrative expense in the condensed consolidated statements of operations was reclassified to conform to the current period presentation and is included as part of the goodwill and intangible asset impairment charges financial statement line item in the current period.