Goodwill and Other Intangible Assets - Narrative (Detail) (USD $)	3 Months Ended			9 Months Ended
	Oct. 31, 2013	Jul. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Impairment of goodwill		$ 14,600,000		$ 14,646,000
Total amortization expense for other intangible assets	$ 400,000		$ 1,100,000	$ 1,200,000	$ 3,700,000