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Retirement Plans - Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan amounts recognized in balance sheet $ (41,131) $ (46,061)
Accrued expenses    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan amounts recognized in balance sheet (1,207) (1,657)
Other liabilities    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan amounts recognized in balance sheet $ (39,924) $ (44,404)