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Schedule of Expected Benefit Payments (Detail) $ in Thousands	Mar. 31, 2019 USD ($)
Compensation And Retirement Disclosure [Abstract]
2020	$ 1,411
2021	1,515
2022	1,602
2023	1,657
2024	1,702
2025-2029	$ 9,702

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Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in fourth fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in third fiscal year following latest fiscal year.

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