Property and Equipment, Net - Components of Property and Equipment, Net (Detail) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2014	Jan. 31, 2014	Jul. 31, 2014 Land and Building [Member]	Jul. 22, 2014 Land and Building [Member]	Jul. 31, 2014 Equipment and computers [Member]	Jan. 31, 2014 Equipment and computers [Member]	Jul. 31, 2014 Furniture and fixtures [Member]	Jan. 31, 2014 Furniture and fixtures [Member]	Jul. 31, 2014 Leasehold improvements [Member]	Jan. 31, 2014 Leasehold improvements [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 29,059	$ 3,839	$ 24,024	$ 24,024	$ 2,845	$ 1,912	$ 1,085	$ 948	$ 1,105	$ 979
Less accumulated depreciation	(2,034)	(1,394)
Total property and equipment, net	$ 27,025	$ 2,445