Relocation (Detail) (Employee Relocation [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
	Oct. 31, 2013	Oct. 31, 2013	Jan. 31, 2013
Employee Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Expenses incurred to date	$ 1.9	$ 8.8
Expenses incurred during fiscal 2013			2.7
Additional expenses expected to be incurred over the remainder of fiscal 2014		$ 2.5