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EQUITY-BASED INCENTIVE AWARDS - Restricted Stock Units (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2015 | Oct. 31, 2014 | Oct. 31, 2013 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Restricted Stock Units |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |
Award outstanding at the end of the period (in shares) | 29,977 |  |  | 29,977 | 29,977 | 28,567 | 29,977
Direct cost to the recipients of the restricted stock units |  |  |  | $ 0 |  |  |
Compensation expense related to the amortization of all equity - based compensation awards |  |  |  | 1,300,000 | $ 1,200,000 |  |
Tax benefit related to compensation expense |  |  |  | $ 500,000 | $ 500,000 |  |
Total intrinsic value of equity-based compensation awards vested |  |  |  |  |  | $ 1,300,000 | $ 1,300,000
Total unamortized compensation expense |  |  |  |  |  | $ 1,300,000 |
Period over which unamortized compensation expense is expected to be amortized |  |  |  | 17 months |  |  |
Number of Shares |  |  |  |  |  |  |
Nonvested restricted stock units at the beginning of the period (in shares) | 29,977 |  |  | 29,977 |  |  |
Granted (in shares) |  |  |  | 13,250 |  |  |
Vested (in shares) |  |  |  | (14,660) |  |  |
Nonvested restricted stock units at the end of the period (in shares) |  |  |  | 28,567 | 29,977 |  |
Weighted Average Fair Value |  |  |  |  |  |  |
Nonvested restricted stock units at the beginning of the period (in dollars per share) | $ 80.00 |  |  | $ 80.00 |  |  |
Granted (in dollars per share) |  |  |  | 83.90 |  |  |
Vested (in dollars per share) |  |  |  | 83.95 |  |  |
Nonvested restricted stock units at the end of the period (in dollars per share) |  |  |  | $ 90.96 | $ 80.00 |  |
Vested (in shares) |  |  |  | 14,660 |  |  |
Restricted Stock Units Awarded October 2013 |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |
Estimated fair value of award at grant date |  |  | $ 1,486,000 |  |  |  |
Award outstanding at the end of the period (in shares) |  |  |  | 6,649 |  | 6,649 |
Fair value of non-vested awards at the end of the period |  |  |  |  |  | $ 605,000 |
Number of Shares |  |  |  |  |  |  |
Granted (in shares) |  |  | 17,600 |  |  |  |
Vested (in shares) |  |  |  | (10,951) |  |  |
Nonvested restricted stock units at the end of the period (in shares) |  |  |  | 6,649 |  |  |
Weighted Average Fair Value |  |  |  |  |  |  |
Vested (in shares) |  |  |  | 10,951 |  |  |
Units scheduled to vest |  |  |  |  |  | 4,669 |
Restricted Stock Units Awarded October 2013 | Vesting of awards equally in three anniversaries from the date of grant |  |  |  |  |  |  |
Weighted Average Fair Value |  |  |  |  |  |  |
Units scheduled to vest |  |  |  |  |  | 1,980 |
Restricted Stock Units Awarded October 2014 |  |  |  |  |  |  |
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) |  |  |  | 8,668 |  | 8,668 |
Fair value of non-vested awards at the end of the period |  |  |  |  |  | $ 788,000 |
Number of Shares |  |  |  |  |  |  |
Granted (in shares) |  | 13,000 |  |  |  |  |
Vested (in shares) |  |  |  | (4,332) |  |  |
Nonvested restricted stock units at the end of the period (in shares) |  |  |  | 8,668 |  |  |
Weighted Average Fair Value |  |  |  |  |  |  |
Vested (in shares) |  |  |  | 4,332 |  |  |
Units scheduled to vest |  |  |  |  |  | 8,668 |
Restricted Stock Units Awarded October 2015 |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |
Estimated fair value of award at grant date | $ 1,112,000 |  |  |  |  |  |
Award outstanding at the end of the period (in shares) |  |  |  | 13,250 |  | 13,250 |
Fair value of non-vested awards at the end of the period |  |  |  |  |  | $ 1,205,000 |
Number of Shares |  |  |  |  |  |  |
Granted (in shares) | 13,250 |  |  |  |  |  |
Nonvested restricted stock units at the end of the period (in shares) |  |  |  | 13,250 |  |  |
Restricted Stock Units Awarded October 2015 | Vesting of awards equally in three anniversaries from the date of grant |  |  |  |  |  |  |
Weighted Average Fair Value |  |  |  |  |  |  |
Units scheduled to vest |  |  |  |  |  | 13,000 |
Restricted Stock Units Awarded October 2015 | Vesting of awards equally in five anniversaries from the date of grant |  |  |  |  |  |  |
Weighted Average Fair Value |  |  |  |  |  |  |
Units scheduled to vest |  |  |  |  |  | 250 |
Minimum | Restricted Stock Units Awarded October 2013 |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |
Service period |  |  | 36 months |  |  |  |
Minimum | Restricted Stock Units Awarded October 2015 |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |
Service period | 36 months |  |  |  |  |  |
Maximum | Restricted Stock Units Awarded October 2013 |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |
Service period |  |  | 60 months |  |  |  |
Maximum | Restricted Stock Units Awarded October 2015 |  |  |  |  |  |  |
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 Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments or cash in accordance with the terms of the arrangement. + 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 + 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 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 Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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 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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