EMPLOYEE STOCK OPTION PLANS (Details) (USD $)	3 Months Ended	6 Months Ended		3 Months Ended		6 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended		0 Months Ended					3 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended		0 Months Ended								3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2012 Range 76.74 to 152.98 [Member]	Sep. 30, 2012 Stock Options [Member]	Sep. 30, 2011 Stock Options [Member]	Sep. 30, 2012 Stock Options [Member]	Sep. 30, 2012 Restricted Stock [Member]	Sep. 30, 2012 Restricted Stock [Member]	Mar. 31, 2012 Restricted Stock [Member]	Jan. 15, 2012 Restricted Stock [Member]	Sep. 30, 2012 Phantom Stock Awards [Member]	Mar. 31, 2012 Phantom Stock Awards [Member]	Jan. 16, 2012 Phantom Stock Awards [Member]	Jul. 30, 2008 1999 Plan [Member] Stock Options [Member]	Jul. 21, 2008 1999 Plan [Member] Stock Options [Member]	Jul. 16, 2007 1999 Plan [Member] Stock Options [Member]	Jul. 17, 2006 1999 Plan [Member] Stock Options [Member]	May 15, 2006 1999 Plan [Member] Stock Options [Member]	Sep. 30, 2012 1999 Plan [Member] Stock Options [Member]	Sep. 30, 2012 1999 Plan [Member] Stock Options [Member]	Mar. 31, 2012 1999 Plan [Member] Stock Options [Member]	Sep. 30, 2012 1999 Plan [Member] Stock Options [Member] Minimum [Member]	Sep. 30, 2012 1999 Plan [Member] Stock Options [Member] Maximum [Member]	Jul. 18, 2011 2009 Plan [Member]	Jul. 19, 2010 2009 Plan [Member]	Mar. 22, 2010 2009 Plan [Member]	Oct. 19, 2009 2009 Plan [Member]	Jul. 18, 2011 2009 Plan [Member] Stock Options [Member]	Jul. 19, 2010 2009 Plan [Member] Stock Options [Member]	Mar. 22, 2010 2009 Plan [Member] Stock Options [Member]	Oct. 19, 2009 2009 Plan [Member] Stock Options [Member]	Sep. 30, 2012 2009 Plan [Member] Stock Options [Member]	Sep. 30, 2012 2009 Plan [Member] Stock Options [Member]	Mar. 31, 2012 2009 Plan [Member] Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)										47,000			26,000																			140,000	140,000
Options available for grant (in shares)							40,350	40,350	37,350																							70,250	70,250
Expiration period from date of grant																				10 years													10 years
Number of annual installments on exercise of awards																						5	10										5
Compensation expense				$ 4,264	$ 258,573		$ 11,077
Unrecognized compensation cost				1,183,858		1,183,858
Weighted average service period						1 year 8 months 12 days		4 years 3 months 18 days
Options fair value assumptions [Abstract]
Weighted average fair value (in dollars per share)														$ 29.93	$ 27.35	$ 41.78	$ 33.05	$ 31.28										$ 33.07	$ 28.58	$ 32.56	$ 25.36
Expected dividend yield (in hundredths)														0.62%	0.67%	0.39%	0.61%	0.64%										0.83%	0.91%	0.84%	1.04%
Risk free interest rate (in hundredths)														3.36%	3.41%	4.95%	5.04%	5.08%										1.45%	1.73%	2.43%	2.36%
Expected volatility (in hundredths)														20.20%	20.20%	19.90%	21.20%	21.10%										40.00%	37.50%	37.80%	37.60%
Expected life (in years)														5 years	5 years	5 years	7 years	7 years										5 years	5 years	5 years	5 years
Stock options [Roll Forward]
Balance at beginning of period (in shares)																				95,000	96,500												83,750	73,750
Granted (in shares)																				0	0			10,000	15,000	20,000	38,750						0	10,000
Exercised (in shares)					(1,500)															(16,090)	(1,500)												(18,800)	0
Canceled (in shares)																			(10,395)	(10,395)	0											(10,000)	(14,000)	0
Balance at end of period (in shares)				119,465		119,465													68,515	68,515	95,000											50,950	50,950	83,750
Weighted Average Exercise Price [Roll Forward]
Beginning of Period (in dollars per share)																				$ 113.63	$ 114.78												$ 85.75	$ 84.24
Granted (in dollars per share)																				$ 0	$ 0			$ 96.92	$ 88.2	$ 95.79	$ 76.74						$ 0	$ 96.92
Exercised (in dollars per share)																				$ 95.36	$ 65.70												$ 78.87	$ 0
Cancelled (in dollars per share)																				$ 108.23	$ 0												$ 95.35	$ 0
Balance at end of period (in dollars per share)				$ 111.98		$ 111.98													$ 129.61	$ 129.61	$ 113.63											$ 88.28	$ 88.28	$ 85.75
Weighted average remaining contractual term, outstanding		1 year 8 months 12 days
Weighted average remaining contractual term, exercisable		1 year 1 month 6 days
Aggregate intrinsic value, outstanding		3,702,185
Aggregate intrinsic value, exercisable		2,303,485
Stock Awards [Abstract]
Award vesting period								5 years
Restricted stock available for issuance beginning balance (in shares)								37,350
Less restricted stock forfeited during the year								3,000
Restricted stock available for issuance ending balance (in shares)							40,350	40,350	37,350																							70,250	70,250
Unrecognized compensation cost							472,549	472,549
Number of shares
Number of shares unvested beginning (in shares)								9,650			26,000
Number of shares granted (in shares)								0			0
Number of shares vested (in shares)								0			0
Number of shares forfeited or expired (in shares)								3,000			7,500
Number of shares unvested ending (in shares)							6,650	6,650	9,650		18,500	26,000
Weighted Average Fair Value Per Share
Weighted Average, Unvested Beginning (in dollars per share)								$ 83.60			$ 146.95
Weighted Average, granted (in dollars per share)								$ 0			$ 0
Weighted Average, vested (in dollars per share)								$ 0			$ 0
Weighted Average, forfeited or expired (in dollars per share)								$ 83.60			$ 146.95
Weighted Average, Unvested Ending (in dollars per share)							$ 83.60	$ 83.60	$ 83.60		$ 146.95	$ 146.95
Weighted Average Remaining Vesting Term (in Years) [Abstract]
Weighted Average Remaining Vesting Term Unvested Beginning								4 years 3 months 18 days	4 years 9 months 18 days		4 years 3 months 18 days	4 years 9 months 18 days
Weighted Average Remaining Vesting Term , granted								0 years			0 years
Weighted Average Remaining Vesting Term, vested								0 years			0 years
Weighted Average Remaining Vesting Term, Forfeited or expired								0 years			0 years
Weighted Average Remaining Vesting Term, Unvested Ending								4 years 3 months 18 days	4 years 9 months 18 days		4 years 3 months 18 days	4 years 9 months 18 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)			$ 76.74
Exercise price range, upper range limit (in dollars per share)			$ 152.98
Options exercisable (in shares)	75,840	68,715
Weighted average exercise price (in dollars per share)	$ 116.75	$ 127.14
New shares issued for cash	$ 98,550