Accumulated Other Comprehensive Income (Loss), Net of Taxes (Detail) (USD $) In Millions, unless otherwise specified	Oct. 31, 2013		Jan. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net gain on derivative instruments	$ 1.2		$ 2.8
Net unrealized gain on available-for-sale securities	2.6	[1]	2.9	[1]
Unfunded portion of pension plans	(13.1)	[1]	(13.1)	[1]
Foreign currency translation adjustments	5.2	[1]	1.7	[1]
Accumulated other comprehensive income (loss)	$ (4.1)		$ (5.7)

[1] (1) For comparability, the presentation of the balances at January 31, 2013 was adjusted to align with current year presentation