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Long-Term Debt - Summary of Long-term Debt (Detail) (USD $) In Millions, unless otherwise specified	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011
Debt Instrument [Line Items]
Carrying amount of long-term debt	$ 1,200.3				$ 1,383.9
Current portion of long-term debt	(25.0)				(12.5)
Long-term debt	1,175.3	1,224.5	1,312.3	1,414.3	1,371.4
2010 Credit Agreement [Member]
Debt Instrument [Line Items]
Carrying amount of long-term debt	255.0				355.4
Current portion of long-term debt	(25.0)
Long-term debt	230.0
Senior Notes due 2017 [Member]
Debt Instrument [Line Items]
Carrying amount of long-term debt	302.3				302.9
Senior Notes due 2019 [Member]
Debt Instrument [Line Items]
Carrying amount of long-term debt	243.6				242.9
Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Carrying amount of long-term debt	256.1				280.1
U.S. Trade accounts receivable credit facility [Member]
Debt Instrument [Line Items]
Carrying amount of long-term debt	110.0				130.0
Other long-term debt [Member]
Debt Instrument [Line Items]
Carrying amount of long-term debt	$ 33.4				$ 72.5

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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-Publisher FASB

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Carrying amount of long-term debt, net of unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19,20)

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+ References

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-Name Accounting Standards Codification

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-SubTopic 10

-Section S99

-Paragraph 1

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