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Accounts and Taxes Payable and Accrued Liabilities - Accounts Payable and Income Taxes Payable (Detail) - USD ($)
Sep. 30, 2018
Mar. 31, 2018
Payables And Accruals [Abstract]    
Accounts payable $ 9,092,000 $ 11,787,000
Income taxes payable and uncertain tax positions 4,609,000 1,666,000
Total accounts and taxes payable $ 13,701,000 $ 13,453,000