Financing Arrangements (Details)										0 Months Ended	1 Months Ended	6 Months Ended
	Mar. 31, 2014 USD ($)	Sep. 30, 2013 USD ($)	Mar. 31, 2014 Letters of credit primarily for self-insured liabilities USD ($)	Mar. 31, 2014 Letters of credit and bank guarantees USD ($)	Mar. 31, 2014 New Zealand USD ($)	Mar. 31, 2014 New Zealand NZD	Mar. 31, 2014 Australia USD ($)	Mar. 31, 2014 Australia AUD	Mar. 31, 2013 Senior unsecured notes USD ($)	Mar. 12, 2013 Senior unsecured notes Maximum	Mar. 31, 2013 Senior unsecured notes Maximum USD ($)	Mar. 31, 2014 Revolving credit agreement USD ($)	Mar. 31, 2014 Secured letter of credit agreement USD ($)
Financial arrangement
Period for issuance of additional senior notes										3 years
Interest rate (as a percent)									3.35%
Additional senior notes principal amount agreed to be issued within the next three years											$ 25,000,000
Short term borrowings
Maximum borrowing capacity under credit agreement					400,000	500,000	2,800,000	3,000,000				200,000,000	62,700,000
Term under revolving credit or letter of agreement												5 years
Borrowings outstanding					0		0					30,000,000
Letters of credit outstanding												27,800,000	59,700,000
Restricted cash	68,984,000	69,381,000
Available amount under line of credit												142,200,000
Principal amount of debt instrument									100,000,000
Letters of Credit and bank guarantees outstanding			11,200,000	91,500,000
Fair value of instruments			0
Self-insurance liabilities	$ 8,000,000	$ 8,800,000