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Retirement Benefits (Narrative) (Details) - USD ($)
shares in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 01, 2018
Defined Benefit Plan Disclosure [Line Items]          
Value of Company Stock Contributed to Defined Contribution Benefit Plans     $ 14,741,000 $ 14,014,000  
Treasury Stock Issued During Period, Shares, Employee Benefit Plans     202 199  
Total stockholders equity          
Defined Benefit Plan Disclosure [Line Items]          
Value of Company Stock Contributed to Defined Contribution Benefit Plans     $ 14,741,000 $ 14,014,000  
Treasury Stock at Cost [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Value of Company Stock Contributed to Defined Contribution Benefit Plans     $ 7,584,000 $ 7,513,000  
Treasury Stock Issued During Period, Shares, Employee Benefit Plans     202 199  
Defined Benefit Pension Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Contributions paid - pensions $ 227,000 $ 99,000 $ 658,000 $ 565,000  
Net periodic retirement (benefit) cost (626,000) (244,000) (2,215,000) (729,000)  
Defined Benefit Pension Plan [Member] | Business Acquisition, Acquiree - L'Orange [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Pension obligation assumed in L'Orange aquisition     38,998,000    
Current portion of pension obligation         $ 1,143,000
Contributions paid - pensions     54,000    
Net periodic retirement (benefit) cost     168,000    
Other Postretirement Benefit Plans [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic retirement (benefit) cost 276,000 325,000 502,000 976,000  
UNITED STATES | Defined Benefit Pension Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Contributions paid - pensions 0 0 0 0  
Net periodic retirement (benefit) cost (666,000) (215,000) (1,995,000) (645,000)  
Duarte Plan, Defined Benefit [Member] | Defined Benefit Pension Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit, Lump Sum Buyout Benefits Paid, Current Year       670,000  
Defined Benefit, Lump Sum Buyout Benefits Paid, Expected     0    
Foreign Plan [Member] | Defined Benefit Pension Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Contributions paid - pensions 227,000 99,000 658,000 565,000  
Net periodic retirement (benefit) cost $ 40,000 $ (29,000) $ (220,000) $ (84,000)