Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Summary of Benefit Payments, Which Reflect Future Service, are Expected to be Paid (Detail)

v3.8.0.1
Employee Benefit Plans - Summary of Benefit Payments, Which Reflect Future Service, are Expected to be Paid (Detail)
$ in Thousands
Mar. 31, 2018
USD ($)
Pension Plans, Defined Benefit [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 $ 1,206
2020 1,338
2021 1,428
2022 1,471
2023 1,490
2024-2028 8,369
Total 15,302
Other Postretirement Benefit Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 81
2020 77
2021 73
2022 69
2023 64
2024-2028 257
Total $ 621