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Quarterly Results of Operations (Unaudited) (Tables) | 12 Months Ended
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Sep. 30, 2017
Quarterly Financial Data [Abstract] |
Summary of quarterly results of operations | Consolidated quarterly results of operations for fiscal 2017 and 2016 were (in millions, except per share amounts):
| Fiscal 2017
| 1st Quarter |  | 2nd Quarter |  | 3rd Quarter |  | 4th Quarter
Revenues | $ | 2,904.2 |  |  | $ | 3,251.3 |  |  | $ | 3,776.4 |  |  | $ | 4,159.1 |
Gross profit | 558.2 |  |  | 614.5 |  |  | 723.4 |  |  | 802.5 |
Income before income taxes | 318.1 |  |  | 353.9 |  |  | 444.5 |  |  | 485.5 |
Income tax expense | 111.2 |  |  | 124.7 |  |  | 155.5 |  |  | 172.3 |
Net income | 206.9 |  |  | 229.2 |  |  | 289.0 |  |  | 313.2 |
Basic net income per common share | 0.55 |  |  | 0.61 |  |  | 0.77 |  |  | 0.84 |
Net income per common share assuming dilution | 0.55 |  |  | 0.60 |  |  | 0.76 |  |  | 0.82 |
| Fiscal 2016
| 1st Quarter |  | 2nd Quarter |  | 3rd Quarter |  | 4th Quarter
Revenues | $ | 2,416.4 |  |  | $ | 2,767.9 |  |  | $ | 3,231.9 |  |  | $ | 3,741.3 |
Gross profit | 468.9 |  |  | 531.7 |  |  | 625.8 |  |  | 732.6 |
Income before income taxes (a) | 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 |
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(a) | In the fourth quarter of fiscal 2016, income before income taxes was reduced by a goodwill impairment charge of $7.2 million.

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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=84173487&loc=d3e1280-108306 + Details
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