Goodwill and Other Intangible Assets - Goodwill and Other Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2014	Jan. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 4,320	$ 4,320
Gross Carrying Amount	6,653	6,563
Accumulated Amortization	(3,569)	(3,362)
Net Carrying Amount	3,084	3,201
Proprietary Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	6 years 2 months 12 days
Gross Carrying Amount	3,623	3,577
Accumulated Amortization	(1,990)	(1,900)
Net Carrying Amount	1,633	1,677
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	3 years 9 months 18 days
Gross Carrying Amount	2,190	2,159
Accumulated Amortization	(1,141)	(1,057)
Net Carrying Amount	1,049	1,102
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	3 years 9 months 18 days
Gross Carrying Amount	660	650
Accumulated Amortization	(344)	(318)
Net Carrying Amount	316	332
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	3 years 9 months 18 days
Gross Carrying Amount	180	177
Accumulated Amortization	(94)	(87)
Net Carrying Amount	$ 86	$ 90