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Financing Arrangements (Details)
$ in Thousands, NZD in Millions, AUD in Millions
1 Months Ended 9 Months Ended
Jul. 17, 2015
USD ($)
Mar. 31, 2013
USD ($)
Jun. 30, 2015
NZD
Jun. 30, 2015
AUD
Jun. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Short term borrowings            
Restricted cash         $ 69,202 $ 69,056
Self-insurance liabilities         8,700 $ 9,100
Letters of credit primarily for self-insured liabilities            
Short term borrowings            
Letters of Credit and bank guarantees outstanding         16,600  
Fair value of instruments         0  
Letters of credit and bank guarantees            
Short term borrowings            
Letters of Credit and bank guarantees outstanding         79,300  
New Zealand            
Short term borrowings            
Maximum borrowing capacity under credit agreement     NZD 0.5   340  
Borrowings outstanding         0  
Australia            
Short term borrowings            
Maximum borrowing capacity under credit agreement       AUD 3.0 2,300  
Borrowings outstanding         0  
Senior unsecured notes            
Financial arrangement            
Interest rate (as a percent)   3.35%        
Additional senior notes principal amount agreed to be issued   $ 100,000        
Senior unsecured notes | Subsequent event            
Financial arrangement            
Interest rate (as a percent) 3.70%          
Additional senior notes principal amount agreed to be issued $ 25,000          
Revolving credit agreement            
Short term borrowings            
Maximum borrowing capacity under credit agreement         200,000  
Term under revolving credit or letter of agreement     5 years      
Borrowings outstanding         70,000  
Letters of credit outstanding         22,900  
Available amount under line of credit         107,100  
Secured letter of credit agreement            
Short term borrowings            
Maximum borrowing capacity under credit agreement         62,800  
Letters of credit outstanding         61,000  
Secured letter of credit agreement | United Kingdom            
Short term borrowings            
Restricted cash         $ 69,200