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Employee Benefit Plans - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, employer contributions $ 0 $ 3,000,000 $ 0
Expected contribution to the plan during the remaining quarters of fiscal 2017   0  
Supplemental Executive Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, employer contributions 100,000 200,000 $ 0
Expected contribution to the plan during the remaining quarters of fiscal 2017   0  
Postretirement Benefit Plan      
Defined Benefit Plan Disclosure [Line Items]      
Increase in net periodic benefit $ 300,000 $ 1,900,000