Stockholders' Equity - Stock Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Oct. 31, 2014
Shares available for grant
Shares Available for Grant, Balance	55,852,536
Shares Available for Grant, Options granted under all plans	(2,606,374)
Shares Available for Grant, Exercised	0
Shares Available for Grant, Expired	(2,582,861)
Shares Available for Grant, Plan shares expired	0
Shares Available for Grant, Cancelled	1,035,115
Shares Available for Grant, Balance	49,291,897
Outstanding Stock Options
Outstanding Stock Options, Balance	28,604,045
Outstanding Stock Options	2,606,374
Outstanding Stock Options, Exercised	(5,680,848)
Outstanding Stock Options, Cancelled	(1,035,115)
Outstanding Stock Options, Balance	24,494,456
Outstanding Stock Options, Vested or expected to vest	23,057,598
Outstanding Stock Options, Exercisable	10,185,611
Options Outstanding Weighted-Average Exercise Price
Weighted- Average Exercise Price, Balance	$ 34.26
Weighted- Average Exercise Price, Options	$ 53.99
Weighted- Average Exercise Price, Exercised	$ 22.57
Weighted- Average Exercise Price, Cancelled	$ 33.49
Weighted- Average Exercise Price, Expired	$ 0.00
Weighted- Average Exercise Price, Balance	$ 39.11
Weighted- Average Exercise Price, Vested or expected to vest	$ 38.59
Weighted- Average Exercise Price, Exercisable	$ 31.18
Aggregate Intrinsic Value
Weighted- Average Exercise Price, Balance	$ 609,478
Weighted- Average Exercise Price, Vested or expected to vest	585,703
Weighted- Average Exercise Price, Exercisable	$ 334,162
Restricted Stock Activity
Shares available for grant
Shares Available for Grant, Restricted stock activity	(6,307,825)
Outstanding Stock Options
Outstanding Stock Options	0
Options Outstanding Weighted-Average Exercise Price
Weighted- Average Exercise Price, Options	$ 0.00
Stock Grants To Board And Advisory Board Members
Shares available for grant
Shares Available for Grant, Stock grants to board and advisory board members	(177,674)
Outstanding Stock Options
Outstanding Stock Options	0
Options Outstanding Weighted-Average Exercise Price
Weighted- Average Exercise Price, Options	$ 0.00
2013 Equity Incentive Plan
Shares available for grant
Shares Available for Grant, Increase in shares authorized	3,132,662
Shares Available for Grant, Balance	49,115,851
Outstanding Stock Options
Outstanding Stock Options, Increase in shares authorized	0
Options Outstanding Weighted-Average Exercise Price
Weighted- Average Exercise Price, Options	$ 0.00
2014 Inducement Equity Incentive Plan
Shares available for grant
Shares Available for Grant, Increase in shares authorized	654,957
Shares Available for Grant, Balance	176,046
Outstanding Stock Options
Outstanding Stock Options, Increase in shares authorized	0
Options Outstanding Weighted-Average Exercise Price
Weighted- Average Exercise Price, Options	$ 0.00
2011 Relate IQ Plan
Shares available for grant
Shares Available for Grant, Increase in shares authorized	291,361
Outstanding Stock Options
Outstanding Stock Options, Increase in shares authorized	0
Options Outstanding Weighted-Average Exercise Price
Weighted- Average Exercise Price, Options	$ 0.00