EQUITY-BASED INCENTIVE AWARDS (Details 2) (USD $)	3 Months Ended		6 Months Ended			0 Months Ended		0 Months Ended		0 Months Ended				0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Restricted Stock Units	Oct. 26, 2011 Restricted Stock Units 1	Mar. 31, 2014 Restricted Stock Units 1	Oct. 23, 2012 Restricted Stock Units 2	Mar. 31, 2014 Restricted Stock Units 2	Oct. 22, 2013 Restricted Stock Units 3	Mar. 31, 2014 Restricted Stock Units 3	Mar. 31, 2014 Restricted Stock Units 3 Vesting of awards equally in three anniversaries from the date of grant	Mar. 31, 2014 Restricted Stock Units 3 Vesting of awards equally in five anniversaries from the date of grant	Oct. 22, 2013 Restricted Stock Units 3 Minimum	Oct. 22, 2013 Restricted Stock Units 3 Maximum
Restricted stock units
Service period						36 months		36 months						36 months	60 months
Estimated fair value of award at grant date						$ 855,000		$ 935,000		$ 1,486,000
Award outstanding at the end of the period (in shares)					33,200		5,300		10,000		17,900	14,000	3,900
Fair value of non-vested awards at the end of the period							454,000		856,000		1,532,000
Vested as of the balance sheet date (in shares)							10,600		5,000
Direct cost to the recipients of the restricted stock units					0
Number of Shares
Nonvested restricted stock units at the beginning of the period (in shares)					29,600		5,300		10,000		17,900	14,000	3,900
Granted (in shares)					17,900	15,900		15,000		17,900
Vested (in shares)					(14,300)
Nonvested restricted stock units at the end of the period (in shares)					33,200		5,300		10,000		17,900	14,000	3,900
Weighted Average Fair Value
Nonvested restricted stock units at the beginning of the period (in dollars per share)					$ 81.89
Granted (in dollars per share)					$ 83.03
Vested (in dollars per share)					$ 80.68
Nonvested restricted stock units at the end of the period (in dollars per share)					$ 85.60
All Equity-Based Awards (stock options and restricted stock units)
Compensation expense related to the amortization of all equity - based compensation awards	400,000	300,000	700,000	700,000
Total unamortized compensation expense	$ 2,300,000		$ 2,300,000