Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jul. 31, 2014	Jan. 31, 2014
Current assets:
Cash and cash equivalents	$ 140,116	$ 262,507
Short-term investments	210,086	25,625
Accounts receivable, net of allowance for doubtful accounts of $386 and $305, respectively	61,897	58,433
Deferred income taxes	2,075	2,075
Income tax receivable	4,840	1,389
Other current assets	3,991	3,703
Total current assets	423,005	353,732
Property and equipment, net	27,025	2,445
Capitalized internal-use software, net	1,428	1,585
Goodwill	4,850	4,850
Intangible assets, net	5,727	6,551
Other long-term assets	2,206	1,145
Total assets	464,241	370,308
Current liabilities:
Accounts payable	1,798	2,117
Accrued compensation and benefits	6,975	8,750
Accrued expenses and other liabilities	8,249	7,931
Income tax payable	932	439
Deferred revenue	85,303	67,380
Total current liabilities	103,257	86,617
Deferred income taxes, noncurrent	1,698	1,698
Other long-term liabilities	1,899	1,897
Total liabilities	106,854	90,212
Commitments and contingencies (Note 10)
Stockholders’ equity:
Additional paid-in capital	292,151	231,534
Accumulated other comprehensive income (loss)	(106)	19
Retained earnings	65,341	48,542
Total stockholders’ equity	357,387	280,096
Total liabilities and stockholders’ equity	464,241	370,308
Class A common stock [Member]
Stockholders’ equity:
Common stock
Class B common stock [Member]
Stockholders’ equity:
Common stock	$ 1	$ 1