Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements - Narrative (Details)

v3.10.0.1
Financing Agreements - Narrative (Details)
 3 Months Ended 9 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 08, 2017
USD ($)
Sep. 30, 2017
USD ($)
Dec. 19, 2014
USD ($)
Dec. 15, 2014
Debt instrument [Line Items]                
Debt Issuance Costs, Line of Credit Arrangements, Gross $ 2,100,000   $ 2,100,000          
Maximum ratio of Indebtedness to EBITDA allowed     3.5          
LeverageHolidayBusinessAcquisition         75,000,000      
Minimum ratio of EBITDA to interest expense allowed     3.0          
LineOfCreditFacilityAccordionFeatureMaximum 450,000,000   $ 450,000,000          
$900 revolving credit facility (excluding outstanding letters of credit)                
Debt instrument [Line Items]                
Line of credit facility, maximum borrowing capacity 698,700,000   698,700,000       $ 700,000,000.0  
Letters of Credit Outstanding, Amount 7,300,000   7,300,000          
Line of credit facility, remaining borrowing capacity $ 717,100,000   $ 717,100,000          
Weighted average interest rates 1.70% 1.46% 1.77% 1.43%        
Weighted average facility fee 0.13% 0.23% 0.16%          
Line of Credit Facility, Current Borrowing Capacity         $ 900,000,000 $ 700,000,000    
Term loan                
Debt instrument [Line Items]                
Debt instrument, face amount           $ 180,000,000 $ 180,000,000.0  
Weighted average interest rates 2.60% 2.39%   2.16%        
$150 senior unsecured notes, net of discount (1)                
Debt instrument [Line Items]                
Debt instrument, face amount $ 150,000,000 $ 150,000,000 $ 150,000,000 $ 150,000,000        
Other Financing Agreements                
Debt instrument [Line Items]                
Line of credit facility, maximum borrowing capacity 250,300,000   250,300,000          
Line of credit facility, amount utilized for bank guarantees 208,000,000   208,000,000          
$100 Series A Notes (2)                
Debt instrument [Line Items]                
Stated interest rate               4.60%
Debt instrument, face amount 100,000,000 $ 100,000,000 100,000,000 $ 100,000,000        
Syndicated credit facility                
Debt instrument [Line Items]                
Line of credit facility, maximum borrowing capacity 150,000,000.0   150,000,000.0          
Debt Issuance Costs, Line of Credit Arrangements, Gross 1,000,000   1,000,000          
Foreign Exchange Forward [Member] | Cash flow hedging                
Debt instrument [Line Items]                
Derivative, notional amount 50,000,000   $ 50,000,000          
Maximum                
Debt instrument [Line Items]                
Debt Instrument, Covenant Holiday, Maximum Ratio of Indebtedness to Earnings before Interest, Taxes, Depreciation, and Amortization     4.0          
Scenario, Previously Reported [Member]                
Debt instrument [Line Items]                
Debt Issuance Costs, Line of Credit Arrangements, Gross 1,000,000   $ 1,000,000          
Scenario, Previously Reported [Member] | Syndicated credit facility                
Debt instrument [Line Items]                
Debt Issuance Costs, Line of Credit Arrangements, Gross $ 600,000   $ 600,000