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Acquisitions (Narrative) (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
May 08, 2017
USD ($)
Aug. 30, 2017
USD ($)
May 25, 2017
USD ($)
Nov. 07, 2016
USD ($)
ft²
Sep. 02, 2016
USD ($)
Jan. 29, 2016
USD ($)
Oct. 16, 2015
USD ($)
Jan. 28, 2015
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Business Acquisition [Line Items]                                      
Payments to Acquire Businesses, Net of Cash Acquired, Total                                 $ 198,628 $ 82,062 $ 20,500
Goodwill                 $ 377,879       $ 323,616       377,879 323,616 291,200
Revenue, Net                 $ 207,005 $ 171,189 $ 161,178 $ 146,368 $ 159,505 $ 140,191 $ 138,930 $ 132,833 685,740 571,459 $ 537,291
Business Acquisition, Pro Forma earnings before tax                                 84,500 76,200  
Business Acquisition, Pro Forma Revenue                                 746,000 $ 695,000  
Fair Value Adjustment to Inventory [Member]                                      
Business Acquisition [Line Items]                                      
Revenues                                 $ 3,800    
Enoserv LLC [Member]                                      
Business Acquisition [Line Items]                                      
Goodwill               $ 10,000                      
Revenues               8,000                      
Business Combination, Consideration Transferred, Total               20,500                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total               $ 9,000                      
Customer Relationships [Member]                                      
Business Acquisition [Line Items]                                      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life       20 years                              
Fremont Plastics, Inc [Member]                                      
Business Acquisition [Line Items]                                      
Payments to Acquire Businesses, Gross             $ 10,500                        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings             $ 2,000                        
Plastique Group Limited [Member]                                      
Business Acquisition [Line Items]                                      
Payments to Acquire Businesses, Gross           $ 31,600                          
Goodwill           10,200                          
Business Combination, Contingent Consideration, Liability           2,700                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total           11,900                          
Revenue, Net           35,000                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total           $ 9,600                          
Westland Technologies, Inc [Member]                                      
Business Acquisition [Line Items]                                      
Payments to Acquire Businesses, Gross         $ 41,000                            
Goodwill         17,900                            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total         28,300                            
Revenue, Net         25,000                            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total         5,500                            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities         $ 9,500                            
Mayday Manufacturing Co [Member]                                      
Business Acquisition [Line Items]                                      
Payments to Acquire Businesses, Net of Cash Acquired, Total       $ 75,000                              
Goodwill       30,200                              
Revenue, Net       40,000                              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total       16,600                              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities       $ 15,600                              
Area of Land | ft²       130,000                              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables       $ 7,300                              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory       10,600                              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Capital Lease Obligation       10,100                              
Mayday Manufacturing Co [Member] | Trade Names [Member]                                      
Business Acquisition [Line Items]                                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total       4,800                              
Mayday Manufacturing Co [Member] | Customer Relationships [Member]                                      
Business Acquisition [Line Items]                                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total       $ 32,800                              
Morgan Schaffer Inc [Member]                                      
Business Acquisition [Line Items]                                      
Payments to Acquire Businesses, Gross     $ 48,800                                
Goodwill     4,800                                
Revenue, Net     25,000                                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles     3,600                                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total     1,700                                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables     2,500                                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory     5,200                                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets     400                                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable     4,900                                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets     $ 35,600                                
Morgan Schaffer Inc [Member] | Customer Relationships and Developed Technology [Member]                                      
Business Acquisition [Line Items]                                      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     10 years                                
NRG Systems Inc [Member]                                      
Business Acquisition [Line Items]                                      
Payments to Acquire Businesses, Net of Cash Acquired, Total $ 38,600                                    
Goodwill 8,000                                    
Revenue, Net 45,000                                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total 9,400                                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables 4,100                                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory 5,100                                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Capital Lease Obligation 9,700                                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets 1,000                                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable 4,100                                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets 8,100                                    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents 1,500                                    
NRG Systems Inc [Member] | Customer Relationships [Member]                                      
Business Acquisition [Line Items]                                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 17,200                                    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 14 years                                    
Vanguard Instruments Company [Member]                                      
Business Acquisition [Line Items]                                      
Payments to Acquire Businesses, Gross   $ 36,000                                  
Goodwill   10,700                                  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings   18,000                                  
Revenue, Net   14,000                                  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total   300                                  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables   1,800                                  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory   $ 2,100                                  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   15 years                                  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable   $ 200                                  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets   $ 3,200