Restructuring Charges - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Oct. 31, 2013
Restructuring and Related Cost [Abstract]
Restructuring charges	$ 2.6	$ 1.3
Amounts remaining to be incurred	9.7		6.6
Employee separation costs [Member]
Restructuring and Related Cost [Abstract]
Restructuring charges	2.4
Asset Impairments [Member]
Restructuring and Related Cost [Abstract]
Restructuring charges	$ 0.2