Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill impairment	$ 0
Other intangible assets not subject to amortization	200,000	$ 200,000
Amortization expense, including impairment charges	7,200,000	$ 5,600,000	$ 3,400,000
2017	6,900,000
2018	6,000,000
2019	5,800,000
2020	5,300,000
2021	4,900,000
Amortization expense thereafter	$ 3,100,000