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Income Taxes Tables | 6 Months Ended
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Mar. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | The reconciliation between the U.S. federal statutory income tax rate and the effective tax rate is presented below.
| Three months ended |  | Six months ended
| March 31, |  | March 31,
| 2017 |  | 2016 |  | 2017 |  | 2016
Adjustments to reconcile to the effective tax rate: |  |  |  |  |  |  |
U.S. federal statutory income tax rate | 35.0 | % |  | 35.0 | % |  | 35.0 | % |  | 35.0 | %
State tax apportionment change | 14.9 |  |  | — |  |  | 6.4 |  |  | — |
State income taxes, net of federal benefit | 3.7 |  |  | 4.4 |  |  | 3.8 |  |  | 4.4 |
Excess tax benefit for stock-based compensation | (30.0 | ) |  | (4.2 | ) |  | (17.2 | ) |  | (3.2 | )
Tax credits | (7.2 | ) |  | (0.6 | ) |  | (3.5 | ) |  | (0.6 | )
U.S. manufacturing deduction | (4.9 | ) |  | (3.3 | ) |  | (4.1 | ) |  | (3.3 | )
Other | 1.5 |  |  | 0.9 |  |  | 1.3 |  |  | (2.1 | )
Effective tax rate | 13.0 | % |  | 32.2 | % |  | 21.7 | % |  | 30.2 | %

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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