Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2010
Changes in the Company's warranty liability
Balance at beginning of year	$ 67,693	$ 93,988	$ 135,749
Warranties issued	8,416	4,852	5,173
Payments	(19,866)	(25,024)	(44,973)
Adjustments	(8,421)	(6,123)	(1,961)
Balance at end of year	$ 47,822	$ 67,693	$ 93,988

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Represents the aggregate Increase or Decrease in the liability during the reporting period for accruals related to preexisting standard and extended product warranties (including adjustments for changes in estimates).

+ References

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Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

+ References

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

-Publisher FASB

-Name FASB Interpretation (FIN)

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Represents the aggregate decrease in the liability for payments made (in cash or in kind) to satisfy claims under the terms of the standard product warranty. Does not include any Increase or Decrease in the liability for payments related to extended product warranties.

+ References

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

-Publisher FASB

-Name FASB Interpretation (FIN)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Represents the aggregate increase in the liability for accruals related to standard product warranties issued during the reporting period. Does not include any increase in the liability for accruals related to extended product warranties.

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

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-Name FASB Interpretation (FIN)

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