Subsequent Event	3 Months Ended
Feb. 28, 2013
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On March 12, 2013, we entered into a $200.0 million unsecured revolving credit facility (the “Credit Facility”) with a syndicate of financial institutions. The Credit Facility will mature on March 12, 2016, or on September 15, 2014 if the aggregate principal amount of our senior notes that mature in 2015 is greater than $200.0 million on that date. The Credit Facility contains an uncommitted accordion feature under which its aggregate principal amount can be increased to up to $300.0 million under certain circumstances, as well as a sublimit of $100.0 million for the issuance of letters of credit, which may be utilized to replace our LOC Facilities. Interest on amounts borrowed under the Credit Facility is payable quarterly at a rate based on either the London Interbank Offered Rate or a base rate, plus a spread that depends on our debt rating and leverage ratio. Under the terms of the Credit Facility, we are required, among other things, to maintain compliance with various covenants, including financial covenants relating to tangible net worth, leverage, and liquidity or interest coverage. The Credit Facility is also governed by a borrowing base and includes a limitation on investments in joint ventures and non-guarantor subsidiaries. Borrowings under the Credit Facility are required to be unconditionally guaranteed jointly and severally by certain of our subsidiaries that meet the definition of a “significant subsidiary” as defined by Rule 1-02 of Regulation S-X (as in effect on June 1, 1996) using a 5% rather than a 10% threshold; provided that the assets of our non-guarantor subsidiaries do not in the aggregate exceed 10% of an adjusted measure of our consolidated total assets. Such subsidiaries include the Guarantor Subsidiaries and 12 additional subsidiaries identified in our Current Report on Form 8-K dated March 12, 2013 ( the “Additional Guarantors”). On March 12, 2013, the Additional Guarantors also agreed to become guarantors under the indenture governing our senior notes and $230 Million Convertible Senior Notes and to guaranty on a senior basis the prompt payment when due of the principal of and premium, if any, and interest on debt securities issued by us pursuant to the indenture. Each of the Additional Guarantors is a wholly-owned subsidiary of ours. We have not made any borrowings under the Credit Facility as of the date of this report.

Subsequent Event

On March 12, 2013, we entered into a $200.0 million unsecured revolving credit facility (the “Credit Facility”) with a syndicate of financial institutions. The Credit Facility will mature on March 12, 2016, or on September 15, 2014 if the aggregate principal amount of our senior notes that mature in 2015 is greater than $200.0 million on that date. The Credit Facility contains an uncommitted accordion feature under which its aggregate principal amount can be increased to up to $300.0 million under certain circumstances, as well as a sublimit of $100.0 million for the issuance of letters of credit, which may be utilized to replace our LOC Facilities. Interest on amounts borrowed under the Credit Facility is payable quarterly at a rate based on either the London Interbank Offered Rate or a base rate, plus a spread that depends on our debt rating and leverage ratio. Under the terms of the Credit Facility, we are required, among other things, to maintain compliance with various covenants, including financial covenants relating to tangible net worth, leverage, and liquidity or interest coverage. The Credit Facility is also governed by a borrowing base and includes a limitation on investments in joint ventures and non-guarantor subsidiaries.

Borrowings under the Credit Facility are required to be unconditionally guaranteed jointly and severally by certain of our subsidiaries that meet the definition of a “significant subsidiary” as defined by Rule 1-02 of Regulation S-X (as in effect on June 1, 1996) using a 5% rather than a 10% threshold; provided that the assets of our non-guarantor subsidiaries do not in the aggregate exceed 10% of an adjusted measure of our consolidated total assets. Such subsidiaries include the Guarantor Subsidiaries and 12 additional subsidiaries identified in our Current Report on Form 8-K dated March 12, 2013 ( the “Additional Guarantors”). On March 12, 2013, the Additional Guarantors also agreed to become guarantors under the indenture governing our senior notes and $230 Million Convertible Senior Notes and to guaranty on a senior basis the prompt payment when due of the principal of and premium, if any, and interest on debt securities issued by us pursuant to the indenture. Each of the Additional Guarantors is a wholly-owned subsidiary of ours. We have not made any borrowings under the Credit Facility as of the date of this report.