Financial Instruments and Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Oct. 31, 2012
Debt Instrument [Line Items]
Approximate reclassification of net loss from accumulated other comprehensive income	$ 0.5
Total notional amount of interest rate derivatives	150
Weighted average of variable interest rate	0.21%		0.21%
Weighted average of fixed interest rate	0.75%		0.75%
Realized losses on interest rate derivatives related to statement of operations	0.2	0.4
Other comprehensive (gain)loss on interest rate derivatives	(0.4)	0.6
Notional amount of outstanding foreign currency forward contracts	183.5		233.2
(Gains) losses recorded under fair value contracts	(1.7)	1.5
Fair value of contract recorded in accumulated other comprehensive income	(0.7)	0.1	(0.9)
Loss on foreign currency forward contracts related to other comprehensive income		0.4	0.4
Realized losses on Energy hedges related to statement of operations		0.2
(Gain) on energy hedge included in accumulated other comprehensive income		(1.0)
Carrying amount of long-term debt	1,315.2		1,200.3
Restructuring-related expenses on long lived assets	0.1	1.8
Net book value of long lived assets	0.1	1.9
Senior Notes [Member]
Debt Instrument [Line Items]
Estimated fair value long-term debt	328.1		330.8
Carrying amount of long-term debt	302.2		302.3
Senior Notes due 2019 [Member]
Debt Instrument [Line Items]
Estimated fair value long-term debt	292.5		286.9
Carrying amount of long-term debt	243.8		243.6
Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Estimated fair value long-term debt	305.0		283.4
Carrying amount of long-term debt	$ 266.2		$ 256.0