Leases - Components of Lease Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019
Lease Cost [Abstract]
Operating lease cost	$ 1,574	$ 1,622	$ 3,201	$ 3,199
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	1,563	1,617	3,175	3,186
Right-of-use assets obtained in exchange for lease obligations, Operating leases	$ 56	$ 3,246	$ 56	$ 3,579
Weighted Average Remaining Lease Terms, Operating leases	4 years		4 years
Weighted Average Discount Rate, Operating leases	4.34%		4.34%