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Pension, Profit Sharing and Other Benefit Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2010
Defined Contribution Plans        
Company contributions to defined contribution plan $ 16,400 $ 13,300 $ 12,100  
Components of net periodic pension cost (benefit)        
Settlement loss     2,671  
Equity securities | Minimum        
Weighted-average assumptions used to determine net periodic benefit cost at the end of the year        
Target allocation percentage 20.00%      
Equity securities | Maximum        
Weighted-average assumptions used to determine net periodic benefit cost at the end of the year        
Target allocation percentage 55.00%      
Debt securities | Minimum        
Weighted-average assumptions used to determine net periodic benefit cost at the end of the year        
Target allocation percentage 25.00%      
Debt securities | Maximum        
Weighted-average assumptions used to determine net periodic benefit cost at the end of the year        
Target allocation percentage 75.00%      
Cash | Minimum        
Weighted-average assumptions used to determine net periodic benefit cost at the end of the year        
Target allocation percentage 0.00%      
Cash | Maximum        
Weighted-average assumptions used to determine net periodic benefit cost at the end of the year        
Target allocation percentage 55.00%      
Real Estate | Minimum        
Weighted-average assumptions used to determine net periodic benefit cost at the end of the year        
Target allocation percentage 0.00%      
Real Estate | Maximum        
Weighted-average assumptions used to determine net periodic benefit cost at the end of the year        
Target allocation percentage 10.00%      
Defined Benefit Pension Plans        
Defined Contribution Plans        
Number of European employees covered by contributory defined benefit pension plan for which benefits were frozen (as a percent)       50.00%
Expected contribution to defined benefit pension plans in next fiscal year $ 5,000      
Unrecognized actuarial loss expected to be recognized in net pension cost over next fiscal year (2,300)      
Unrecognized actuarial loss expected to be recognized in net pension cost over next fiscal year, net of tax 1,800      
Plan assets expected to be returned in 2018 0      
Projected benefit obligation, ABO and fair value of plan assets for the defined benefit pension plans in which the ABO was in excess of the fair value of plan assets        
Projected benefit obligation 222,332 235,097    
Accumulated benefit obligation 222,332 235,097    
Fair value of plan assets 214,530 209,722    
Change in benefit obligations:        
Net benefit obligation at the beginning of the year 235,097 241,117    
Service cost 606 617 595  
Interest cost 7,529 7,091 8,972  
Actuarial (gain) loss (9,449) (10,082)    
Gross benefits paid (8,034) (7,549)    
Foreign currency exchange rate changes (3,417) 3,903    
Net benefit obligation at the end of the year 222,332 235,097 241,117  
Change in plan assets:        
Fair value of plan assets at the beginning of the year 209,722 194,253    
Actual return on plan assets 11,998 14,915    
Employer contributions 5,117 5,354    
Gross benefits paid (8,034) (7,549)    
PBGC Premium paid (286) (348)    
Administrative expenses (698) (547)    
Foreign currency exchange rate changes (3,289) 3,644    
Fair value of plan assets at the end of the year 214,530 209,722 194,253  
Unfunded status of the plans (7,802) (25,375)    
Unrecognized net actuarial loss 48,081 58,572    
Net amount recognized 40,279 33,197    
Amounts recognized in Accumulated OCI        
Liability adjustment to OCI (48,081) (58,572)    
Deferred tax asset 7,365 15,033    
Valuation allowance on deferred tax asset 610 (2,107)    
Accumulated other comprehensive loss (40,106) (45,646)    
Components of net periodic pension cost (benefit)        
Service cost 606 617 595  
Interest cost 7,529 7,091 8,972  
Expected return on plan assets (14,120) (12,928) (13,182)  
Amortization of actuarial loss 2,777 3,700 1,869  
Settlement loss     2,671  
Administrative expenses 438 474 177  
Net pension cost (benefit) $ (2,770) $ (1,046) $ 1,102  
Weighted-average assumptions used to determine benefit obligation at the end of the year        
Discount rate (as a percent) 3.60% 3.30% 3.00%  
Rate of compensation increase (as a percent) 3.30% 3.20% 3.10%  
Weighted-average assumptions used to determine net periodic benefit cost at the end of the year        
Discount rate (as a percent) 3.30% 3.00% 4.10%  
Expected return on plan assets (as a percent) 6.80% 6.80% 6.80%  
Rate of compensation increase (as a percent) 3.20% 3.10% 3.10%  
Defined Benefit Pension Plans | Equity securities        
Change in plan assets:        
Fair value of plan assets at the beginning of the year $ 101,433      
Fair value of plan assets at the end of the year 107,424 $ 101,433    
Defined Benefit Pension Plans | Real Estate        
Change in plan assets:        
Fair value of plan assets at the beginning of the year 4,790      
Fair value of plan assets at the end of the year   4,790    
Non-qualified deferred compensation plan        
Deferred compensation plans        
Liabilities associated with the non-qualified deferred compensation plan 11,500 11,400    
Assets set aside to fund deferred compensation liabilities $ 6,400 $ 5,300    
Employee Stock Purchase Plan        
Employee Stock Purchase Plan        
ESPP discount rate (as a percent) 5.00%      
Maximum annual employee contributions $ 25,000