Leases - Components of Lease Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
Lease Cost [Abstract]
Operating lease cost	$ 1,572	$ 1,675	$ 4,773	$ 4,874
Supplemental cash flow information related to leases was as follows:
Cash paid for amounts included in the measurement of lease liabilities, Operating cash flows from operating leases	1,568	1,663	4,743	4,849
Right-of-use assets obtained in exchange for lease obligations, Operating leases	$ 138	$ 1,494	$ 194	$ 4,359
Weighted Average Remaining Lease Terms, Operating leases	4 years		4 years
Weighted Average Discount Rate, Operating leases	4.32%		4.32%