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Share-Based Employee Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Aug. 07, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of shares available for future grant   3,760,315   3,760,315 3,000,000
Stock option expense   $ 1.1 $ 1.1    
Aggregate intrinsic value for outstanding options   16.7   $ 16.7  
Total intrinsic value of options exercised   0.1      
Restricted stock or unit expense   $ 7.1 $ 2.4    
Stock Awards [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of shares available for future grant         1,500,000
Performance Vesting Stock Options [Member] | Long Term Compensation Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of shares available for future grant 100,849        
Reduced percentage of shares earned in stock options plan   66.70%      
Stock based compensation plan, description       The performance criteria for the Fiscal 2020 Employee Performance Stock Option Grant is based upon the achievement of certain levels of return on equity (as defined in the option agreements), ranging from 10.0% to 20.0%, for the fiscal year ending March 31, 2020. All stock options will be earned if the return on equity is 20.0% or greater, and the percentage of shares earned will be reduced proportionately to approximately 66.7% if the return on equity is 10.0%. If the Company does not achieve a return on equity of at least 10.0%, all stock options granted will be forfeited.  
Share-based compensation vesting period 4 years        
Share-based compensation award expiration term 10 years        
Performance Vesting Stock Options [Member] | Long Term Compensation Plan [Member] | Minimum [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Percentage of average return on invested capital 10.00%        
Share-based compensation expiration date   Mar. 31, 2020      
Performance Vesting Stock Options [Member] | Long Term Compensation Plan [Member] | Maximum [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Percentage of average return on invested capital 20.00%        
Share-based compensation expiration date   Mar. 31, 2023      
Time Vesting Stock Options [Member] | Long Term Compensation Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of shares available for future grant 84,043        
Share-based compensation vesting period 4 years        
Stock Options [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Unrecognized compensation cost, stock options   $ 10.8   $ 10.8  
Weighted-average period of recognition of unrecognized compensation cost   2 years 10 months 24 days      
Performance Vesting Restricted Stock [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of shares available for future grant 51,112        
Stock based compensation plan, description   The performance criteria for the Fiscal 2020 Employee Restricted Stock Performance Award is based upon the achievement of certain levels of return on equity (as defined in the award agreement), ranging from 10.0% to 20.0%, for the fiscal year ending March 31, 2020. All restricted shares will be earned if the return on equity is 20.0% or greater, and the percentage of shares earned will be reduced proportionately to approximately 66.7% if the return on equity is 10.0%. If the Company does not achieve a return on equity of at least 10.0%, all awards will be forfeited.      
Share-based compensation vesting period 4 years        
Reduced percentage of restricted shares   66.70%      
Performance Vesting Restricted Stock [Member] | Minimum [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Percentage of average return on invested capital 10.00%        
Share-based compensation vesting date   Mar. 31, 2020      
Performance Vesting Restricted Stock [Member] | Maximum [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Percentage of average return on invested capital 20.00%        
Share-based compensation vesting date   Mar. 31, 2022      
Time Vesting Restricted Stock [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Number of shares available for future grant 42,591        
Share-based compensation vesting period 4 years        
Restricted Stock [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Weighted-average period of recognition of unrecognized compensation cost   2 years 6 months      
Weighted average grant date fair value, shares awarded   $ 91.58      
Unrecognized compensation cost   $ 19.1   $ 19.1