Property and Equipment (Details) (USD $)	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012	Jan. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 30,646,000		$ 30,646,000		$ 22,920,000
Less: accumulated depreciation and amortization	(16,209,000)		(16,209,000)		(9,715,000)
Property and equipment, net	14,437,000		14,437,000		13,205,000
Depreciation and amortization expense	3,600,000	1,200,000	6,500,000	3,400,000
Impairment of long-lived assets			2,128,000	0
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	18,860,000		18,860,000		16,077,000
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,144,000		4,144,000		2,714,000
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 7,642,000		$ 7,642,000		$ 4,129,000