Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013	Jan. 31, 2012
Deferred tax assets:
Allowance for doubtful accounts	$ 299	$ 290
Accrued expenses	1,348	1,282
Deferred revenue	4,128	3,333
State taxes	225	675
Long-lived assets acquired in a business combination, net	861	1,041
Net operating losses and tax credits carryforward	5,987	5,893
Stock-based compensation	3,285	3,709
Other	245	291
Gross deferred tax assets	16,378	16,514
Valuation allowance	(1,779)	(846)
Net deferred tax assets	14,599	15,668
Deferred tax liabilities:
Long-lived assets acquired in a business combination, net	(14,119)	(27,758)
Property and equipment, net	(520)	(176)
Income from discharge of indebtedness	(2,850)	(2,843)
Unremitted foreign earnings	(483)	(725)
Other	(229)	14
Total deferred tax liabilities	(18,201)	(31,488)
Net deferred tax liabilities	$ (3,602)	$ (15,820)