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Share-Based Employee Compensation - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
May 31, 2016
Jun. 30, 2016
Jun. 30, 2015
Aug. 07, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of shares available for future grant   4,341,783   3,000,000
Stock option expense   $ 1.2 $ 2.0  
Aggregate intrinsic value for outstanding options   29.6    
Aggregate intrinsic value of exercisable options   29.3    
Total intrinsic value of options exercised   13.2    
Restricted stock or unit expense   $ 1.4 $ 2.0  
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 91,074      
Reduced percentage of shares earned in stock options plan 66.70%      
Share-based compensation vesting period 4 years      
Share-based compensation award expiration term 10 years      
Stock based compensation plan, description   The performance criterion for the Fiscal 2017 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 11.0% to 18.0%, for the fiscal year ending March 31, 2017. All stock options will be earned if the return on equity is 18.0% or greater, and the percentage of shares earned will be reduced proportionately to approximately 66.7% if the return on equity is 11.0%. If the Company does not achieve a return on equity of at least 11.0%, all stock options granted will be forfeited.    
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 11.00%      
Share-based compensation expiration date   Mar. 31, 2018    
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 18.00%      
Share-based compensation expiration date   Mar. 31, 2020    
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 75,896      
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   $ 10.3    
Weighted-average period of recognition of unrecognized compensation cost   2 years 9 months 18 days    
Performance Vesting Restricted Stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of shares available for future grant 63,029      
Share-based compensation vesting period 4 years      
Stock based compensation plan, description   The performance criterion for the Fiscal 2017 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 11.0% to 18.0%, for the fiscal year ending March 31, 2017. All restricted shares will be earned if the return on equity is 18.0% or greater, and the percentage of shares earned will be reduced proportionately to approximately 66.7% if the return on equity is 11.0%. If the Company does not achieve a return on equity of at least 11.0%, all awards will be forfeited.    
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 11.00%      
Share-based compensation vesting date   Mar. 31, 2018    
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 18.00%      
Share-based compensation vesting date   Mar. 31, 2020    
Time Vesting Restricted Stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of shares available for future grant 52,527      
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 2 months 12 days    
Unrecognized compensation cost   $ 20.4