Income Taxes (Details 3) (USD $)	Nov. 30, 2012	Dec. 02, 2011 Canadian income tax examination [Member]
Income Tax Examination [Line Items]
Accrued tax and interest related to income tax examination		$ 35,000,000
Income tax examination, liability recorded, current		17,000,000
Impact of income tax examination to deferred tax assets for accrued tax and interest		18,000,000
Estimated potential decreases in underlying unrecognized tax benefits, minimum	0
Estimated potential decreases in underlying unrecognized tax benefits, maximum	$ 5,000,000

Adjustment to deferred tax assets for accrued tax and interest resulting from income tax audit

No definition available.

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- Definition

Income Tax Examination, Liability Recorded, Current

+ References

No definition available.

+ Details

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- Definition

The estimated loss resulting from the income tax examination that has been accrued as of the balance sheet date, including interest and penalties.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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- Definition

The estimated lower bound of the reasonably possible change in the total amount of the unrecognized tax benefit (that will significantly increase or decrease within twelve months of the balance sheet date) for a tax position taken.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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- Definition

The estimated upper bound of the reasonably possible change in the total amount of the unrecognized tax benefit (that will significantly increase or decrease within twelve months of the balance sheet date) for a tax position taken.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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