Financing Arrangements (Details)										1 Months Ended	9 Months Ended
	Jun. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Jun. 30, 2014 Letters of credit primarily for self-insured liabilities USD ($)	Jun. 30, 2014 Letters of credit and bank guarantees USD ($)	Jun. 30, 2014 New Zealand USD ($)	Jun. 30, 2014 New Zealand NZD	Jun. 30, 2014 Australia USD ($)	Jun. 30, 2014 Australia AUD	Mar. 31, 2013 Senior unsecured notes USD ($)	Mar. 31, 2013 Senior unsecured notes Maximum USD ($)	Jun. 30, 2014 Revolving credit agreement USD ($)	Jun. 30, 2014 Secured letter of credit agreement USD ($)
Financial arrangement
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				8,000,000
Letters of credit outstanding											34,200,000	62,200,000
Restricted cash	69,028,000	69,381,000
Available amount under line of credit											157,800,000
Principal amount of debt instrument									100,000,000
Letters of Credit and bank guarantees outstanding			8,900,000	100,600,000
Fair value of instruments			0
Self-insurance liabilities	$ 8,500,000	$ 8,800,000