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Other Intangible Assets - Additional Information (Detail)
Mar. 31, 2018
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2019 $ 437,000
2020 437,000
2021 437,000
2022 436,000
2023 427,000
Thereafter $ 1,241,000