Stockholders' Equity (Deficit) - Summary of Stock Option Activity (Detail)	12 Months Ended
	Feb. 28, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares, Beginning balance | shares	4,208,201
Shares, Granted | shares	279,746
Shares, Exercised | shares	(622,848)
Shares, Canceled/forfeited | shares	(350,821)
Shares, Ending balance | shares	3,514,278
Shares, Vested and exercisable | shares	2,580,061
Shares, Vested and expected to vest | shares	3,435,251
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-Average Exercise Price, Outstanding, Beginning Balance (in usd per share) | $ / shares	$ 20.42
Weighted-Average Exercise Price, Granted (in usd per share) | $ / shares	20.04
Weighted-Average Exercise Price, Exercised (in usd per share) | $ / shares	12.52
Weighted-Average Exercise Price, Canceled/Forfeited (in usd per share) | $ / shares	27.86
Weighted-Average Exercise Price, Outstanding, Ending Balance (in usd per share) | $ / shares	21.05
Weighted-Average Exercise Price, Vested and exercisable (in usd per share) | $ / shares	18.60
Weighted-Average Exercise Price, Vested and expected to vest (in usd per share) | $ / shares	$ 20.78
Share-based Compensation Arrangement by Share-based Payment Award Options Outstanding Weighted Average Term [Abstract]
Weighted-Average Remaining Contractual Term, Vested and exercisable, Ending Balance	6 years
Weighted-Average Remaining Contractual Term, Vested and expected to vest, Ending Balance	6 years 5 months 27 days
Share-based Compensation Arrangement by Share-based Payment Award Options Aggregate Intrinsic Value [Abstract]
Aggregate Intrinsic Value, Vested and Exercisable, Ending Balance | $	$ 19,423,229,000
Aggregate Intrinsic Value, Vested and expected to vest | $	$ 21,317,808,000