Balance Sheet Information - Property and Equipment, Net (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016	Feb. 28, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 65,612		$ 65,612		$ 58,424
Accumulated depreciation and amortization	(33,569)		(33,569)		(28,445)
Property and equipment, net	32,043		32,043		29,979
Depreciation, amortization and impairment expense			8,545	$ 8,467
Property and equipment
Property, Plant and Equipment [Line Items]
Depreciation, amortization and impairment expense	2,600	$ 2,300	5,100	$ 4,700
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,849		9,849		9,849
Building
Property, Plant and Equipment [Line Items]
Property and equipment, gross	6,549		6,549		6,549
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	39,923		39,923		32,850
Vehicles, machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,799		4,799		4,797
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 4,492		$ 4,492		$ 4,379