Goodwill and Other Intangible Assets (Detail) (USD $)	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 19,387,000	$ 21,060,000
Accumulated Amortization	(10,547,000)	(8,794,000)
Tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,008,000	10,950,000
Accumulated Amortization	(3,798,000)	(4,855,000)
Weighted Average Amortization Period in Years	14 years	14 years
Customer/contract-related [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,340,000	2,340,000
Accumulated Amortization	(3,215,000)	(1,526,000)
Weighted Average Amortization Period in Years	1 year	2 years
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,012,000	4,616,000
Accumulated Amortization	(1,634,000)	(1,372,000)
Weighted Average Amortization Period in Years	15 years	12 years
Software and licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,747,000	1,289,000
Accumulated Amortization	(919,000)	(286,000)
Weighted Average Amortization Period in Years	3 years	3 years
Non-competition agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	680,000	705,000
Accumulated Amortization	(255,000)	(165,000)
Weighted Average Amortization Period in Years	6 years	6 years
Other intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,600,000	1,160,000
Accumulated Amortization	$ (726,000)	$ (590,000)
Weighted Average Amortization Period in Years	21 years	24 years