Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014	Jan. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unvested shares subject to repurchase at an aggregate price	$ 0.1		$ 0.1		$ 0.1
Weighted-average grant date fair value of options granted	$ 12.40	$ 9.79	$ 12.36	$ 13.80
Unrecognized compensation cost, net of estimated forfeitures, related to unvested stock options granted	$ 36.9		$ 36.9
Intrinsic value of options exercised	13.8		$ 26.8
2012 and 2013 Equity Incentive Plan [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense, net of forfeitures, is recognized over the requisite service periods of awards			4 years
2012 and 2013 Equity Incentive Plan [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation expense, net of forfeitures, is recognized over the requisite service periods of awards			9 years
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average period of unvested stock			4 years 2 months 12 days
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average period of unvested stock			3 years 4 months 24 days
Weighted average grant date fair value, RSUs granted			$ 26.93
Number of shares, RSUs granted			1,147,910
Unrecognized compensation cost, net of estimated forfeitures, related to unvested RSUs	$ 48.4		$ 48.4
Restricted Stock Units (RSUs) [Member] \| Qforma CrowdLink [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, RSUs granted			17,000
Performance-based RSUs, estimated value			$ 0.5
Restricted Stock Units (RSUs) [Member] \| 2013 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value, RSUs granted	$ 27.50	$ 22.03	$ 26.93	$ 24.35
Class A common stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares outstanding	75,553,842		75,553,842		64,729,479
Class B common stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares outstanding	56,749,327		56,749,327		66,338,146
Common stock, shares unvested	136,000		136,000		195,833