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Equity Incentive Plan (Narrative) (Details) $ / shares in Units, shares in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2005 | Sep. 30, 2016 USD ($) shares / unit $ / shares shares | Sep. 30, 2015 USD ($) $ / shares shares | Sep. 30, 2014 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation | $ |  | $ 65,996 | $ 50,182 | $ 50,889
Common stock issuable per restricted stock unit | shares / unit |  | 1 |  |
Total unrecognized compensation cost | $ |  | $ 81,900 |  |
Weighted average remaining recognition period, in months |  | 17 months |  |
Common stock were available for grant under the 2000 plan | shares |  | 5,100 |  |
Common stock were reserved for issuance | shares |  | 3,800 |  |
vesting period | 4 years |  |  |
Option expiration period | 10 years |  |  |
Options outstanding and exercisable (in shares) | shares |  | 0 |  |
Shares retained by company to cover tax withholdings | shares |  | 600 | 800 | 800
Employee tax withholdings | $ |  | $ 20,900 | $ 29,200 | $ 26,900
Directors And Executive Officers [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Pre-vesting forfeiture rate |  | 0.00% | 0.00% | 0.00%
Other Employees [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Pre-vesting forfeiture rate |  | 11.00% | 7.00% | 7.00%
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average fair value per share | $ / shares |  | $ 37.25 |  |
Restricted Shares and Restricted Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average fair value per share | $ / shares |  | $ 37.25 | $ 38.19 | $ 33.88
Minimum [Member] | Vice President [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Pre-vesting forfeiture rate |  | 6.00% | 2.00% | 2.00%
Maximum [Member] | Vice President [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Pre-vesting forfeiture rate |  | 8.00% | 4.00% | 4.00%
Performance-based Award [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average fair value per share | $ / shares |  | $ 46.96 |  |
stock modification [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation | $ |  | $ 10,000 |  |

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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