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STOCK-BASED COMPENSATION (Details 3) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Stock based awards |  |  |
Exercisable Stock Options, Weighted-Average Exercise Price (in dollars per share) | $ 41.62 |  |
Stock options |  |  |
Stock based awards |  |  |
Weighted-average remaining life of exercisable stock options | 4 years 2 months 12 days |  |
Exercisable stock options, aggregate intrinsic value (in dollars) | $ 20.5 |  |
Exercisable Stock Options, Weighted-Average Exercise Price (in dollars per share) | $ 41.62 |  |
Number of options vested or expected to vest (in shares) | 2,768,897 |  |
Options vested or expected to vest, aggregate intrinsic value (in dollars) | $ 20.5 |  |
Options vested or expected to vest, weighted-average exercise price (in dollars per share) | $ 48.46 |  |
Unrecognized compensation cost (in dollars) | $ 5.3 |  |
Period over which unrecognized compensation cost is expected to be recognized | 2 years 4 months 24 days |  |
Total intrinsic value of options exercised (in dollars) | $ 10.7 | $ 100.9 | $ 40.4
Grant date fair value of shares vested (in dollars) | 8.1 | $ 8.8 | $ 9.3
Restricted stock |  |  |
Stock based awards |  |  |
Unrecognized compensation cost (in dollars) | $ 21.2 |  |
Period over which unrecognized compensation cost is expected to be recognized | 2 years 2 months 12 days |  |
Restricted stock awards activity, shares |  |  |
Unvested at the beginning of the period (in shares) | 634,000 | 576,000 | 430,000
Granted (in shares) | 275,250 | 230,000 | 307,000
Vested (in shares) | (214,000) | (157,000) | (155,000)
Forfeited (in shares) | (27,000) | (15,000) | (6,000)
Unvested at the end of the period (in shares) | 668,000 | 634,000 | 576,000
Restricted stock awards activity, weighted average grant date fair value |  |  |
Unvested at the beginning of the period (in dollars per share) | $ 64.03 | $ 55.17 | $ 52.52
Granted (in dollars per share) | 68.83 | 79.67 | 54.18
Vested (in dollars per share) | 60.80 | 54.08 | 45.88
Forfeited (in dollars per share) | 64.45 | 67.92 | 54.67
Unvested at the end of the period (in dollars per share) | $ 67.03 | $ 64.03 | $ 55.17

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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -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 weighted average fair value at grant date for nonvested equity-based awards issued 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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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