Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Income Tax Disclosure [Line Items]
Prepaid expenses and income taxes	$ 0	$ 3,870,000
Income taxes due included in accounts and income taxes payable	696,000
Recognizes interest and penalties related to uncertain tax positions	(99,000)	(10,000)	$ 22,000
Accrued interest and penalties related to uncertain tax positions	$ 107,000	$ 206,000	$ 216,000
Earliest Tax Year [Member]
Income Tax Disclosure [Line Items]
Tax fiscal years open to examination	2017
Latest Tax Year [Member]
Income Tax Disclosure [Line Items]
Tax fiscal years open to examination	2020