Goodwill and Other Intangible Assets - Goodwill and Other Intangible Assets (Detail) (USD $)	6 Months Ended
	Jul. 31, 2014	Jan. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 5,703,000	$ 4,320,000
Gross Carrying Amount	16,686,000	6,563,000
Accumulated Amortization	(3,945,000)	(3,362,000)
Net Carrying Amount	12,741,000	3,201,000
Proprietary Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	8 years 4 months 24 days
Gross Carrying Amount	6,546,000	3,577,000
Accumulated Amortization	(2,102,000)	(1,900,000)
Net Carrying Amount	4,444,000	1,677,000
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	6 years 3 months 18 days
Gross Carrying Amount	7,336,000	2,159,000
Accumulated Amortization	(1,332,000)	(1,057,000)
Net Carrying Amount	6,004,000	1,102,000
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	7 years 1 month 6 days
Gross Carrying Amount	2,482,000	650,000
Accumulated Amortization	(409,000)	(318,000)
Net Carrying Amount	2,073,000	332,000
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life	7 years 2 months 12 days
Gross Carrying Amount	322,000	177,000
Accumulated Amortization	(102,000)	(87,000)
Net Carrying Amount	$ 220,000	$ 90,000