FINANCING ARRANGEMENTS (Details)	12 Months Ended										0 Months Ended							12 Months Ended
	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2012 USD ($)	Sep. 30, 2014 Letters of credit primarily for self-insured liabilities USD ($)	Sep. 30, 2014 Letters of credit and bank guarantees USD ($)	Sep. 30, 2014 New Zealand USD ($)	Sep. 30, 2014 New Zealand NZD	Sep. 30, 2014 Australia USD ($)	Sep. 30, 2014 Australia AUD	Mar. 31, 2013 Senior unsecured notes Expected USD ($)	Mar. 31, 2013 Senior unsecured notes Maximum USD ($)	Sep. 30, 2014 Series A senior unsecured notes USD ($)	Sep. 30, 2013 Series A senior unsecured notes USD ($)	Sep. 30, 2014 Series B senior unsecured notes USD ($)	Sep. 30, 2013 Series B senior unsecured notes USD ($)	Sep. 30, 2014 Mortgage notes United Kingdom USD ($)	Sep. 30, 2013 Mortgage notes United Kingdom USD ($)	Sep. 30, 2014 Revolving credit agreement USD ($)	Sep. 30, 2014 Secured letter of credit agreement USD ($)	Sep. 30, 2014 Secured letter of credit agreement United Kingdom USD ($)
Financial arrangement
Interest rate (as a percent)										3.35%		3.35%	3.35%	3.35%	3.35%	6.48%	6.48%
Long-term Debt	$ 102,390,000	$ 102,920,000										$ 50,000,000	$ 50,000,000	$ 50,000,000	$ 50,000,000	$ 2,390,000	$ 2,920,000
Less current portion	(563,000)	(557,000)
Long-term Debt, Excluding Current Maturities	101,827,000	102,363,000
Maturities of long-term debt
2015	600,000
2016	600,000
2017	600,000
2018	600,000
2019	100,000
Amount of interest paid	4,100,000	3,700,000	7,400,000
Amount of interest paid to U.S. District Court in connection with arbitration award		600,000	5,900,000
Principal amount of debt instrument										100,000,000
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
Letters of credit outstanding																		8,100,000	61,600,000
Available amount under line of credit																		191,900,000
Restricted cash	69,056,000	69,381,000
Cash on deposit as collateral																				69,100,000
Letters of Credit and bank guarantees outstanding				8,900,000	75,200,000
Fair value of instruments				0
Self-insurance liabilities	9,100,000	8,800,000
Short term borrowings
Maximum borrowing capacity under credit agreement						400,000	500,000	2,600,000	3,000,000									200,000,000	62,600,000
Borrowings outstanding																		$ 0