Stock Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jul. 31, 2013	Jun. 06, 2013
Shares available for grant
Shares Available for Grant, Balance as of January 31, 2013	11,759,740	21,900,000
Shares Available for Grant, Options granted under all plans	(4,554,571)
Shares Available for Grant, Exercised	0
Shares Available for Grant, Cancelled	554,131
Shares Available for Grant, Balance as of July 31, 2013	70,785,753	21,900,000
Outstanding Stock Options
Outstanding Stock Options, Balance as of January 31, 2013	29,983,292
Outstanding Stock Options	4,554,571
Outstanding Stock Options, Exercised	(3,584,945)
Outstanding Stock Options, Cancelled	(554,131)
Outstanding Stock Options, Balance as of July 31, 2013	30,398,787
Outstanding Stock Options, Vested or expected to vest	29,192,079
Outstanding Stock Options, Exercisable as of July 31, 2013	12,232,395
Weighted- Average Exercise Price, Balance as of January 31, 2013	$ 26.60
Weighted- Average Exercise Price, Options	$ 26.14
Weighted- Average Exercise Price, Exercised	$ 17.27
Weighted- Average Exercise Price, Cancelled	$ 30.29
Weighted- Average Exercise Price, Balance as of July 31, 2013	$ 27.56
Weighted- Average Exercise Price, Vested or expected to vest	$ 27.42
Weighted- Average Exercise Price, Exercisable as of July 31, 2013	$ 22.82
Aggregate Intrinsic Value
Weighted- Average Exercise Price, Balance as of July 31, 2013	$ 492,193
Weighted- Average Exercise Price, Vested or expected to vest	476,849
Weighted- Average Exercise Price, Exercisable as of July 31, 2013	$ 256,054
Restricted Stock Activity
Shares available for grant
Shares Available for Grant, Restricted stock activity	(1,352,834)
Outstanding Stock Options
Outstanding Stock Options	0
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	(62,400)
Outstanding Stock Options
Outstanding Stock Options	0
Weighted- Average Exercise Price, Options	$ 0.00
2004 Equity Incentive Plan
Shares available for grant
Shares Available for Grant, Increase in shares authorized: 2004 Equity Incentive Plan	14,000,000
Outstanding Stock Options
Outstanding Stock Options	0
Weighted- Average Exercise Price, Options	$ 0.00
2013 Equity Incentive Plan
Shares available for grant
Shares Available for Grant, Increase in shares authorized	69,924,140
Shares Available for Grant, Balance as of July 31, 2013	69,586,359
Outstanding Stock Options
Outstanding Stock Options	0
Weighted- Average Exercise Price, Options	$ 0.00
2010 EdgeSpring Plan
Shares available for grant
Shares Available for Grant, Increase in shares authorized	124,859
Outstanding Stock Options
Outstanding Stock Options	0
Weighted- Average Exercise Price, Options	$ 0.00
2004 ExactTarget Plan
Shares available for grant
Shares Available for Grant, Increase in shares authorized	136,986
Outstanding Stock Options
Outstanding Stock Options	0
Weighted- Average Exercise Price, Options	$ 0.00
2008 ExactTarget Plan
Shares available for grant
Shares Available for Grant, Increase in shares authorized	3,202,185
Outstanding Stock Options
Outstanding Stock Options	0
Weighted- Average Exercise Price, Options	$ 0.00
Plan
Shares available for grant
Shares Available for Grant, Plan shares expired	(22,946,483)
Outstanding Stock Options
Outstanding Stock Options	0
Weighted- Average Exercise Price, Options	$ 0.00