Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements - Narrative (Details)

v3.6.0.2
Financing Agreements - Narrative (Details)
 3 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2016
USD ($)
Dec. 19, 2014
USD ($)
Dec. 15, 2014
Debt instrument [Line Items]          
Maximum ratio of Indebtedness to EBITDA allowed 3.5        
Minimum ratio of EBITDA to interest expense allowed 3.5        
Restricted cash and cash equivalent $ 800,000   $ 800,000    
$700 revolving credit facility (excluding outstanding letters of credit)          
Debt instrument [Line Items]          
Line of credit facility, maximum borrowing capacity 309,600,000     $ 700,000,000.0  
Letters of Credit Outstanding, Amount 9,300,000        
Line of credit facility, remaining borrowing capacity $ 445,000,000        
Weighted average interest rates 1.40% 1.21%      
Weighted average facility fee 0.23% 0.18%      
Term loan          
Debt instrument [Line Items]          
Debt instrument, face amount       $ 180,000,000.0  
Weighted average interest rates 1.94% 1.46%      
$150 senior unsecured notes, net of discount (1)          
Debt instrument [Line Items]          
Debt instrument, face amount $ 150,000,000 $ 150,000,000      
Debt Issuance Costs, Net 700,000   800,000    
Other Financing Agreements          
Debt instrument [Line Items]          
Line of credit facility, maximum borrowing capacity 202,000,000        
Line of credit facility, amount utilized for bank guarantees 106,900,000        
$100 Series A Notes (2)          
Debt instrument [Line Items]          
Stated interest rate         4.60%
Debt instrument, face amount 100,000,000 $ 100,000,000      
Debt Issuance Costs, Net 400,000   400,000    
Syndicated credit facility          
Debt instrument [Line Items]          
Line of credit facility, maximum borrowing capacity 150,000,000        
Adjustments for New Accounting Pronouncement [Member]          
Debt instrument [Line Items]          
Debt Issuance Costs, Net 1,100,000   $ 1,200,000.0    
Foreign Exchange Forward [Member] | Cash flow hedging          
Debt instrument [Line Items]          
Derivative, notional amount $ 50,000,000