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Quarterly Results of Operations (Unaudited) (Tables) | 12 Months Ended
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Sep. 30, 2016
Quarterly Financial Data [Abstract] |
Summary of quarterly results of operations | Consolidated quarterly results of operations for fiscal 2016 and 2015 were (in millions, except per share amounts):
| Fiscal 2016
| 1st Quarter |  | 2nd Quarter |  | 3rd Quarter |  | 4th Quarter
Revenues | $ | 2,416.4 |  |  | $ | 2,767.9 |  |  | $ | 3,231.9 |  |  | $ | 3,741.3 |
Inventory and land option charges | 2.0 |  |  | 6.0 |  |  | 8.1 |  |  | 15.4 |
Gross profit | 468.9 |  |  | 531.7 |  |  | 625.8 |  |  | 732.6 |
Income before income taxes | 241.3 |  |  | 300.5 |  |  | 378.6 |  |  | 433.0 |
Income tax expense | 83.6 |  |  | 105.4 |  |  | 128.8 |  |  | 149.4 |
Net income | 157.7 |  |  | 195.1 |  |  | 249.8 |  |  | 283.6 |
Basic net income per common share | 0.43 |  |  | 0.53 |  |  | 0.67 |  |  | 0.76 |
Net income per common share assuming dilution | 0.42 |  |  | 0.52 |  |  | 0.66 |  |  | 0.75 |
| Fiscal 2015
| 1st Quarter |  | 2nd Quarter |  | 3rd Quarter |  | 4th Quarter
Revenues | $ | 2,302.6 |  |  | $ | 2,398.0 |  |  | $ | 2,950.8 |  |  | $ | 3,172.5 |
Inventory and land option charges | 6.0 |  |  | 12.5 |  |  | 15.4 |  |  | 26.3 |
Gross profit | 438.6 |  |  | 446.5 |  |  | 556.0 |  |  | 582.3 |
Income before income taxes | 220.7 |  |  | 230.1 |  |  | 333.8 |  |  | 338.8 |
Income tax expense | 78.2 |  |  | 82.2 |  |  | 112.4 |  |  | 99.9 |
Net income | 142.5 |  |  | 147.9 |  |  | 221.4 |  |  | 238.9 |
Basic net income per common share | 0.39 |  |  | 0.40 |  |  | 0.60 |  |  | 0.65 |
Net income per common share assuming dilution | 0.39 |  |  | 0.40 |  |  | 0.60 |  |  | 0.64 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1280-108306 + Details
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