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Financing Arrangements (Details)
$ in Thousands, NZD in Millions
1 Months Ended 12 Months Ended
Aug. 11, 2016
USD ($)
Feb. 02, 2016
USD ($)
Jul. 17, 2015
USD ($)
May 31, 2017
USD ($)
Mar. 31, 2013
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2017
NZD
Sep. 30, 2017
USD ($)
Financial arrangement                    
Long-term debt, gross             $ 201,012     $ 200,000
Less unamortized debt issuance costs             (271)     (239)
Less current portion             (450)      
Long-term debt             200,291     199,761
Maturities of long-term debt                    
2018                   0
2019                   0
2020                   10,700
2021                   35,700
2022                   35,700
Amount of interest paid           $ 14,800 11,000 $ 4,800    
Short term borrowings                    
Letters of credit outstanding                   94,500
Debt issuance costs incurred             3,647      
Self-insurance liabilities             8,200     7,600
Letters of credit primarily for self-insured liabilities                    
Short term borrowings                    
Letters of Credit and bank guarantees outstanding                   17,100
Fair value of instruments                   0
Letters of credit and bank guarantees                    
Short term borrowings                    
Letters of Credit and bank guarantees outstanding                   77,400
New Zealand                    
Short term borrowings                    
Maximum borrowing capacity under credit agreement                 NZD 0.5 400
Borrowings outstanding                   $ 0
Senior unsecured notes                    
Financial arrangement                    
Interest rate (as a percent)   3.93% 3.70%   3.35%          
Maturities of long-term debt                    
Additional senior notes principal amount agreed to be issued   $ 75,000 $ 25,000   $ 100,000          
Short term borrowings                    
Coupon rate increase based on leverage ratio (as a percent)     0.50%              
Series A senior unsecured notes                    
Financial arrangement                    
Interest rate (as a percent)                 3.35% 3.35%
Long-term debt, gross             50,000     $ 50,000
Series B senior unsecured notes                    
Financial arrangement                    
Interest rate (as a percent)                 3.35% 3.35%
Long-term debt, gross             50,000     $ 50,000
Series C senior unsecured notes                    
Financial arrangement                    
Interest rate (as a percent)                 3.70% 3.70%
Long-term debt, gross             25,000     $ 25,000
Series D senior unsecured notes                    
Financial arrangement                    
Interest rate (as a percent)                 3.93% 3.93%
Long-term debt, gross             $ 75,000     $ 75,000
Mortgage notes | United Kingdom                    
Financial arrangement                    
Interest rate (as a percent)             6.48%      
Long-term debt, gross             $ 1,012      
Revolving credit agreement                    
Short term borrowings                    
Maximum borrowing capacity under credit agreement                   400,000
Borrowings outstanding                   55,000
Letters of credit outstanding                   81,300
Available amount under line of credit                   $ 263,700
Coupon rate increase based on leverage ratio (as a percent)           0.75%        
Cost of debt revision       $ 400            
Weighted average interest rate on outstanding borrowings                 3.24% 3.24%
Debt issuance costs incurred $ 1,300 $ 2,300                
Unamortized debt issuance costs                   $ 2,800
Revolving credit agreement | United Kingdom                    
Short term borrowings                    
Cash on deposit as collateral                   8,400
Other revolving credit facilities                    
Short term borrowings                    
Letters of credit outstanding                   $ 13,200
Secured letter of credit agreement | United Kingdom                    
Short term borrowings                    
Borrowings outstanding             62,700      
Cash on deposit as collateral             $ 69,400