Goodwill and Other Intangible Assets - Changes in Net Carrying Amount of Goodwill (Detail) - USD ($)	12 Months Ended
	Feb. 28, 2018	Feb. 28, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill, Beginning balance	$ 70,603,000	$ 64,537,000
Goodwill acquired		6,066,000
Goodwill impairment	0	0
Goodwill, Ending balance	$ 70,603,000	$ 70,603,000