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EQUITY-BASED INCENTIVE AWARDS: (Details 2) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2013 | Oct. 31, 2012 | Dec. 31, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Restricted Stock Units |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |
Award outstanding at the end of the period (in shares) |  |  | 32,900 | 32,900 | 32,900 | 29,977 | 32,900
Direct cost to the recipients of the restricted stock units |  |  |  | $ 0 |  |  |
Period over which unamortized compensation expense is expected to be amortized |  |  |  | 18 months |  |  |
Tax benefit related to compensation expense |  |  |  | $ 500,000 | $ 500,000 |  |
Total intrinsic value of equity-based compensation awards vested |  |  |  |  |  | $ 1,300,000 | $ 1,200,000
All Equity-Based Awards (stock options and restricted stock units) |  |  |  |  |  |  |
Compensation expense related to the amortization of all equity - based compensation awards |  |  |  | $ 1,200,000 | $ 1,300,000 |  |
Total unamortized compensation expense |  |  |  |  |  | $ 1,200,000 |
Number of Shares |  |  |  |  |  |  |
Nonvested restricted stock units at the beginning of the period (in shares) |  |  | 32,900 | 32,900 |  |  |
Granted (in shares) |  |  |  | 13,000 |  |  |
Vested (in shares) |  |  |  | (15,923) |  |  |
Nonvested restricted stock units at the end of the period (in shares) |  |  |  | 29,977 | 32,900 |  |
Weighted Average Fair Value |  |  |  |  |  |  |
Nonvested restricted stock units at the beginning of the period (in dollars per share) |  |  | $ 84.75 | $ 84.75 |  |  |
Granted (in dollars per share) |  |  |  | 83.30 |  |  |
Vested (in dollars per share) |  |  |  | 82.93 |  |  |
Nonvested restricted stock units at the end of the period (in dollars per share) |  |  |  | $ 80.00 | $ 84.75 |  |
Restricted Stock Units 1 |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |
Service period |  | 36 months |  |  |  |  |
Estimated fair value of award at grant date |  | $ 935,000 |  |  |  |  |
Award outstanding at the end of the period (in shares) |  |  |  | 5,000 |  | 5,000 |
Fair value of non-vested awards at the end of the period |  |  |  |  |  | $ 400,000 |
Vested as of the balance sheet date (in shares) |  |  |  |  |  | 10,000 |
Number of Shares |  |  |  |  |  |  |
Granted (in shares) |  | 15,000 |  |  |  |  |
Nonvested restricted stock units at the end of the period (in shares) |  |  |  | 5,000 |  |  |
Restricted Stock Units 2 |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |
Estimated fair value of award at grant date | $ 1,486,000 |  |  |  |  |  |
Award outstanding at the end of the period (in shares) |  |  |  | 11,977 |  | 11,977 |
Fair value of non-vested awards at the end of the period |  |  |  |  |  | $ 958,000 |
Number of Shares |  |  |  |  |  |  |
Granted (in shares) | 17,600 |  |  |  |  |  |
Nonvested restricted stock units at the end of the period (in shares) |  |  |  | 11,977 |  |  |
Restricted Stock Units 2 | Vesting of awards equally in three anniversaries from the date of grant |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |
Award outstanding at the end of the period (in shares) |  |  |  | 9,337 |  | 9,337 |
Vested as of the balance sheet date (in shares) |  |  |  |  |  | 5,623 |
Number of Shares |  |  |  |  |  |  |
Nonvested restricted stock units at the end of the period (in shares) |  |  |  | 9,337 |  |  |
Restricted Stock Units 2 | Vesting of awards equally in five anniversaries from the date of grant |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |
Award outstanding at the end of the period (in shares) |  |  |  | 2,640 |  | 2,640 |
Number of Shares |  |  |  |  |  |  |
Nonvested restricted stock units at the end of the period (in shares) |  |  |  | 2,640 |  |  |
Restricted Stock Units 3 |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |
Service period |  |  | 36 months |  |  |  |
Estimated fair value of award at grant date |  |  | $ 1,083,000 |  |  |  |
Award outstanding at the end of the period (in shares) |  |  |  | 13,000 |  | 13,000 |
Fair value of non-vested awards at the end of the period |  |  |  |  |  | $ 1,040,000 |
Number of Shares |  |  |  |  |  |  |
Granted (in shares) |  |  | 13,000 |  |  |  |
Nonvested restricted stock units at the end of the period (in shares) |  |  |  | 13,000 |  |  |
Restricted Stock Units 3 | Vesting of awards equally in three anniversaries from the date of grant |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |
Award outstanding at the end of the period (in shares) |  |  |  | 13,000 |  | 13,000 |
Number of Shares |  |  |  |  |  |  |
Nonvested restricted stock units at the end of the period (in shares) |  |  |  | 13,000 |  |  |
Minimum | Restricted Stock Units 2 |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |
Service period | 36 months |  |  |  |  |  |
Maximum | Restricted Stock Units 2 |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |
Service period | 60 months |  |  |  |  |  |

X
- Definition Amount of direct cost applicable to the recipients of the 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 No definition available. + Details
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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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during 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 (h)(1)(i) -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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