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Mortgages and Notes Payable (Narratives) (Details) (USD $) | 0 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  | 0 Months Ended | 9 Months Ended | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended | 3 Months Ended |  |  |  |  |  |  |  |
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Jan. 29, 2013 | Aug. 31, 2013 | Aug. 31, 2012 | Aug. 31, 2013 | Aug. 31, 2012 | Mar. 12, 2013 | Nov. 30, 2012 | Aug. 31, 2013 Letter of Credit [Member] | Mar. 12, 2013 Letter of Credit [Member] | Mar. 12, 2013 Revolving Credit Facility [Member] | Aug. 31, 2013 Revolving Credit Facility [Member] | Mar. 12, 2013 Revolving Credit Facility [Member] Minimum [Member] | Mar. 12, 2013 Revolving Credit Facility [Member] Maximum [Member] | Jan. 29, 2013 Convertible senior notes due February 1, 2019 at 1.375% | Jul. 31, 2012 Senior Notes [Member] | Jan. 29, 2013 Convertible Notes Payable [Member] Convertible senior notes due February 1, 2019 at 1.375% | Aug. 31, 2013 Convertible Notes Payable [Member] Convertible senior notes due February 1, 2019 at 1.375% | Feb. 07, 2012 Senior Notes [Member] | Feb. 29, 2012 Senior Notes [Member] | Aug. 31, 2013 Senior Notes [Member] Senior notes due March 15, 2020 at 8.00% | Nov. 30, 2012 Senior Notes [Member] Senior notes due March 15, 2020 at 8.00% | Feb. 07, 2012 Senior Notes [Member] Senior notes due March 15, 2020 at 8.00% | Aug. 31, 2013 Senior Notes [Member] Senior notes due September 15, 2017 at 9.10% | Nov. 30, 2012 Senior Notes [Member] Senior notes due September 15, 2017 at 9.10% | Aug. 31, 2013 Senior Notes [Member] Senior notes due September 15, 2022 at 7.50% | Nov. 30, 2012 Senior Notes [Member] Senior notes due September 15, 2022 at 7.50% | Jul. 31, 2012 Senior Notes [Member] Senior notes due September 15, 2022 at 7.50%
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early Repayment of Senior Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 252,200,000 |  |  | $ 340,500,000 |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 244,900,000 |  |  | 340,000,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0365297 |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility, current borrowing capacity |  |  |  |  |  | 200,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility, expiration date |  |  |  |  |  |  |  |  |  | Mar. 12, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility, contingent expiration date |  |  |  |  |  |  |  |  |  | Sep. 15, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility, contingent expiration, senior notes threshold |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  | 100,000,000 | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, unused capacity, commitment fee percentage |  |  |  |  |  |  |  |  |  |  |  | 0.50% | 0.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility, remaining borrowing capacity |  |  |  |  |  |  |  | 100,000,000 |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, significant subsidiary threshold, percent |  |  |  | 5.00% |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, non guarantor subsidiary threshold, percent |  |  |  | 10.00% |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of addtional guarantor subsidiaries |  |  |  |  |  |  |  |  |  |  | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  | 230,000,000 |  | 230,000,000 | 230,000,000 |  |  |  |  | 350,000,000 | 265,000,000 |  |  |  | 350,000,000
Senior notes, rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.375% |  |  | 1.375% |  |  | 8.00% | 8.00% | 8.00% | 9.10% | 9.10% | 7.50% | 7.50% | 7.50%
Gain (loss) on early extinguishment of debt |  |  | 8,300,000 | 0 | 10,278,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |
Percentage of principal amount in relation to issued value of senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued | 36.5297 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, conversion price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 27.37 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible, conversion premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47.00% |  |  |  |  |  |  |  |  |  |  |
Share price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18.62 |  |  |  |  |  |  |  |  |  |  |
Incremental Common Shares Attributable to Conversion of Debt Securities |  | 8,402,000 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  | 8,401,831 |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount in relation to redemption value of notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Percentage of principal amount for purchase of notes if change in control |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 222,700,000 |  |  |  |  |  |  |  |  |  |  |
Ownership share in guarantor subsidiaries (percent) |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  | 41,100,000 |  | 41,100,000 |  |  | 41,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventories pledged to collateralize mortgages and land contracts, carrying value |  | 80,000,000 |  | 80,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal payments on senior notes, mortgages and land contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2013 |  | 22,500,000 |  | 22,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2014 |  | 83,000,000 |  | 83,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2015 |  | 342,400,000 |  | 342,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2016 |  | 2,500,000 |  | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2017 |  | 261,900,000 |  | 261,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due thereafter |  | $ 1,220,000,000 |  | $ 1,220,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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