Overview and Basis of Presentation - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016	Feb. 28, 2017
New Accounting Pronouncement, Early Adoption [Line Items]
Net gain (loss) from foreign exchange transactions	$ 900,000	$ 900,000	$ 1,900,000	$ 1,400,000
Retained Earnings | Accounting Standards Update 2016-09
New Accounting Pronouncement, Early Adoption [Line Items]
Cumulative effect of new accounting principle in period of adoption					$ 400,000
Additional Paid-in Capital | Accounting Standards Update 2016-09
New Accounting Pronouncement, Early Adoption [Line Items]
Cumulative effect of new accounting principle in period of adoption					$ 0