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STOCK-BASED COMPENSATION - Incentive Plan (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Nov. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Common-stock based award plan |  |  |  |
Compensation expense (in dollars) |  | $ 24,383 | $ 25,195 | $ 26,703
Excess tax benefit from stock-based compensation |  | $ 934 | 3,772 | 26,616
Stock options |  |  |  |
Common-stock based award plan |  |  |  |
The period from the grant date after which options expire |  | 10 years |  |
Compensation expense (in dollars) |  | $ 8,290 | $ 8,846 | $ 11,268
Option vesting rights (as a percent) |  | 25.00% |  |
Weighted-average assumptions utilized in determining the fair value of options |  |  |  |
Risk-free interest rate (as a percent) |  | 1.80% | 1.70% | 1.60%
Expected stock volatility (as a percent) |  | 37.60% | 36.90% | 52.60%
Dividend yield (as a percent) |  | 4.60% | 3.90% | 3.10%
Expected term (in years) |  | 5 years 6 months | 5 years 6 months | 5 years 6 months
Weighted-average fair value of options granted (in dollars per share) |  | $ 13.12 | $ 16.39 | $ 29.44
Options |  |  |  |
Options outstanding at the beginning of the period (in shares) |  | 2,776,000 | 2,629,000 | 3,991,000
Granted (in shares) | 876,379 | 876,000 | 420,000 | 261,000
Exercised (in shares) |  | (220,000) | (255,000) | (1,613,000)
Forfeited/Expired (in shares) |  | (120,000) | (18,000) | (10,000)
Option outstanding at the end of the period (in shares) |  | 3,312,000 | 2,776,000 | 2,629,000
Exercisable at the end of the period (in shares) |  | 2,225,000 | 2,014,000 | 1,884,000
Shares available to grant |  | 6,600,000 | 2,515,000 | 3,432,000
Weighted-Average Exercise Price |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  | $ 48.51 | $ 43.46 | $ 34.12
Granted (in dollars per share) |  | 58.25 | 68.83 | 79.67
Exercised (in dollars per share) |  | 31.52 | 28.46 | 26.08
Forfeited/Expired (in dollars per share) |  | 61.80 | 66.78 | 68.82
Outstanding at the end of the period (in dollars per share) |  | 51.74 | 48.51 | 43.46
Exercisable at the end of the period (in dollars per share) |  | $ 46.66 | $ 41.62 | $ 35.93
Stock options | Minimum |  |  |  |
Common-stock based award plan |  |  |  |
Vesting period |  | 1 year |  |
Stock options | Maximum |  |  |  |
Common-stock based award plan |  |  |  |
Vesting period |  | 4 years |  |
Restricted stock |  |  |  |
Common-stock based award plan |  |  |  |
Number of shares granted |  | 294,000 | 275,000 | 230,000
Compensation expense (in dollars) |  | $ 16,093 | $ 16,349 | $ 15,435
Options |  |  |  |
Granted (in shares) |  | 294,575 |  |
Restricted stock | Minimum |  |  |  |
Common-stock based award plan |  |  |  |
Vesting period |  | 3 years |  |
Restricted stock | Maximum |  |  |  |
Common-stock based award plan |  |  |  |
Vesting period |  | 6 years |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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 (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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 (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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