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Pension and Profit Sharing Plans - Additional information (Detail)
$ in Thousands
 1 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Employee
CompensationPlan
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, payments for settlement $ 3,900   $ 3,857    
Settlement cost 600   $ 649    
Expected return on plan assets     7.50% 7.50% 8.00%
Costs relating to employer discretionary contributions     $ 8,400 $ 6,400 $ 6,200
Current actuarial estimates contributions     $ 600 300 300
Number of employees covered under multi-employer pension plans | Employee     60    
Number of multi-employer plans | CompensationPlan     3    
Collective bargaining agreement for employer covered under multi-employer plans, Expiration ending date     Mar. 31, 2020    
Expenses related to Multi employer plans     $ 1,600 $ 1,600 $ 1,300
Salaried Employees [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Employees fully vesting in employer's own contributions made beginning in 2007, requirement years     6 years    
Hourly Employees [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Employees fully vesting in employer's own contributions made beginning in 2007, requirement years     3 years    
Minimum [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Current actuarial estimates contributions for fiscal year 2018 2,500   $ 2,500    
Maximum [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Current actuarial estimates contributions for fiscal year 2018 $ 3,000   $ 3,000    
Scenario Forecast [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Expected return on plan assets   6.00%      
Expenses related to Multi employer plans   $ 1,800