Schedule of Expected Benefit Payments (Detail) $ in Thousands	Mar. 31, 2016 USD ($)
Pension Plans, Defined Benefit
Schedule of Pension Expected Future Benefit Payments [Line Items]
2017	$ 5,944
2018	6,991
2019	6,733
2020	7,683
2021	7,050
2022 – 2026	36,480
Total 10-year estimated future benefit payments	70,881
Other Pension Plans, Defined Benefit
Schedule of Pension Expected Future Benefit Payments [Line Items]
2017	818
2018	410
2019	416
2020	435
2021	421
2022 – 2026	1,928
Total 10-year estimated future benefit payments	$ 4,428