Goodwill and Other Intangible Assets - Goodwill and Other Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified				12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2014 Proprietary Rights [Member]	Jan. 31, 2013 Proprietary Rights [Member]	Jan. 31, 2014 Customer Relationships [Member]	Jan. 31, 2013 Customer Relationships [Member]	Jan. 31, 2014 Patents [Member]	Jan. 31, 2013 Patents [Member]	Jan. 31, 2014 Trade Name [Member]	Jan. 31, 2013 Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life				6 years 4 months 24 days		4 years 1 month 6 days		4 years 1 month 6 days		4 years 1 month 6 days
Goodwill	$ 4,320	$ 4,320	$ 4,320
Gross Carrying Amount	6,563	6,826		3,577	3,503	2,159	2,402	650	724	177	197
Accumulated Amortization	(3,362)	(2,837)		(1,900)	(1,625)	(1,057)	(876)	(318)	(264)	(87)	(72)
Net Carrying Amount	$ 3,201	$ 3,989	$ 4,696	$ 1,677	$ 1,878	$ 1,102	$ 1,526	$ 332	$ 460	$ 90	$ 125