FINANCING ARRANGEMENTS (Details)	12 Months Ended																		0 Months Ended						12 Months Ended
	Sep. 30, 2013 USD ($)	Sep. 30, 2012 USD ($)	Sep. 30, 2011 USD ($)	Jun. 30, 2013 USD ($)	Mar. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Jun. 30, 2012 USD ($)	Mar. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Sep. 30, 2013 Letters of credit primarily for self-insured liabilities USD ($)	Sep. 30, 2013 Letters of credit and bank guarantees USD ($)	Sep. 30, 2013 New Zealand USD ($)	Sep. 30, 2013 New Zealand NZD	Sep. 30, 2013 Australia USD ($)	Sep. 30, 2013 Australia AUD	Apr. 23, 2013 Senior unsecured notes USD ($)	Mar. 12, 2013 Senior unsecured notes USD ($)	Mar. 31, 2013 Senior unsecured notes Forecast USD ($)	Mar. 12, 2013 Senior unsecured notes Maximum USD ($)	Sep. 30, 2013 Series A senior unsecured notes USD ($)	Sep. 30, 2013 Series B senior unsecured notes USD ($)	Sep. 30, 2013 Mortgage notes United Kingdom USD ($)	Sep. 30, 2012 Mortgage notes United Kingdom USD ($)	Sep. 30, 2012 Unsecured notes payable to a group of insurance companies USD ($)	Sep. 30, 2013 Revolving credit agreement USD ($)	Sep. 30, 2013 Secured letter of credit agreement USD ($)	Sep. 30, 2013 Secured letter of credit agreement United Kingdom USD ($)
Financial arrangement
Interest rate (as a percent)																3.35%	3.35%	3.35%		3.35%	3.35%	6.48%
Long-term debt	$ 102,920,000	$ 11,503,000																		$ 50,000,000	$ 50,000,000	$ 2,920,000	$ 3,503,000	$ 8,000,000
Less current portion	(557,000)	(4,561,000)		(529,000)	(527,000)	(4,563,000)	(4,545,000)	(4,556,000)	(4,539,000)
Long-term debt, noncurrent portion	102,363,000	6,942,000		102,380,000	52,502,000	2,814,000	6,995,000	7,191,000	7,233,000
Maturities of long-term debt
2014	600,000
2015	600,000
2016	600,000
2017	600,000
2018	500,000
Amount of interest paid	3,700,000	7,400,000	1,100,000
Amount of interest paid to U.S. District Court in connection with arbitration award	600,000	5,900,000
Principal amount of debt instrument																50,000,000	50,000,000	100,000,000
Period for issuance of additional senior notes																			3 years
Additional senior notes principal amount agreed to be issued within the next three years																			25,000,000
Term under revolving credit or letter of agreement																									5 years	1 year
Letters of credit outstanding																									23,500,000	54,400,000
Available amount under line of credit																									176,500,000
Restricted cash	69,381,000	68,749,000		68,853,000	68,833,000	68,829,000	68,681,000	68,584,000
Cash on deposit as collateral																											68,900,000
Letters of Credit and bank guarantees outstanding										12,400,000	89,600,000
Fair value of instruments										0
Self-insurance liabilities	8,800,000	8,700,000
Short term borrowings
Maximum borrowing capacity under credit agreement												400,000	500,000	2,900,000	3,000,000										200,000,000	62,600,000
Borrowings outstanding												$ 0		$ 0											$ 0