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Income Taxes - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Dec. 31, 2017
Jun. 30, 2019
Jun. 30, 2018
Income Tax Disclosure [Line Items]      
Effective tax rate   28.10% 23.10%
Provisional remeasurement of deferred tax liabilities resulted in an discrete tax benefit   $ 0 $ 11,200,000
Effective income tax rate excluding impact of net deferred tax liability   28.10% 34.30%
Unrecognized income tax benefits   $ 0  
Federal      
Income Tax Disclosure [Abstract]      
Number of years for examination   4 years  
Federal | Tax Year 2017      
Income Tax Disclosure [Line Items]      
Corporate income tax rate 35.00%    
Federal | Tax Year2019      
Income Tax Disclosure [Line Items]      
Corporate income tax rate   21.00%  
New York      
Income Tax Disclosure [Abstract]      
Number of years for examination   4 years  
Connecticut      
Income Tax Disclosure [Abstract]      
Number of years for examination   4 years  
Pennsylvania      
Income Tax Disclosure [Abstract]      
Number of years for examination   4 years  
New Jersey      
Income Tax Disclosure [Abstract]      
Number of years for examination   5 years