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Intangible Assets, Net (Schedule of Finite-Lived and Indefinite-Lived Intangible Assets by Major Class) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]          
Intangible Assets, Gross (Excluding Goodwill), Total $ 1,002,484   $ 1,002,484   $ 443,476
Accumulated Amortization of Finite-Lived Intangible (294,723)   (294,723)   (271,594)
Net Carrying Amount - Finite-Lived Intangible 643,513   643,513    
Intangible Assets, Net (Excluding Goodwill), Total 707,761   707,761   171,882
Amortization expense 11,360 $ 6,439 23,861 $ 19,328  
Trade Names [Member]          
Finite-Lived Intangible Assets [Line Items]          
Indefinite-Lived Intangible Assets 64,248   64,248    
Process Technology [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Value - Finite-Lived Intangible 171,589   171,589   99,555
Accumulated Amortization of Finite-Lived Intangible (72,516)   (72,516)   (66,880)
Net Carrying Amount - Finite-Lived Intangible 99,073   99,073   32,675
Customer Relationships [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Value - Finite-Lived Intangible 704,631   704,631   323,187
Accumulated Amortization of Finite-Lived Intangible (197,890)   (197,890)   (185,562)
Net Carrying Amount - Finite-Lived Intangible 506,741   506,741   137,625
Intellectual Property [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Value - Finite-Lived Intangible 19,480   19,480   19,422
Accumulated Amortization of Finite-Lived Intangible (18,527)   (18,527)   (18,196)
Net Carrying Amount - Finite-Lived Intangible 953   953   1,226
Backlog [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Value - Finite-Lived Intangible 40,885   40,885    
Accumulated Amortization of Finite-Lived Intangible (4,579)   (4,579)    
Net Carrying Amount - Finite-Lived Intangible 36,306   36,306    
Other Intangibles [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Value - Finite-Lived Intangible 1,651   1,651   1,312
Accumulated Amortization of Finite-Lived Intangible (1,211)   (1,211)   (956)
Net Carrying Amount - Finite-Lived Intangible 440   440   356
Aerospace [Member]          
Finite-Lived Intangible Assets [Line Items]          
Intangible Assets, Gross (Excluding Goodwill), Total 358,055   358,055   358,830
Accumulated Amortization of Finite-Lived Intangible (216,069)   (216,069)   (200,279)
Intangible Assets, Net (Excluding Goodwill), Total 141,986   141,986   158,551
Aerospace [Member] | Process Technology [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Value - Finite-Lived Intangible 76,372   76,372   76,605
Accumulated Amortization of Finite-Lived Intangible (53,377)   (53,377)   (49,124)
Net Carrying Amount - Finite-Lived Intangible 22,995   22,995   27,481
Aerospace [Member] | Customer Relationships [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Value - Finite-Lived Intangible 281,683   281,683   282,225
Accumulated Amortization of Finite-Lived Intangible (162,692)   (162,692)   (151,155)
Net Carrying Amount - Finite-Lived Intangible 118,991   118,991   131,070
Aerospace [Member] | Intellectual Property [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Value - Finite-Lived Intangible 0   0   0
Accumulated Amortization of Finite-Lived Intangible 0   0   0
Net Carrying Amount - Finite-Lived Intangible 0   0   0
Aerospace [Member] | Other Intangibles [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Value - Finite-Lived Intangible 0   0   0
Accumulated Amortization of Finite-Lived Intangible 0   0   0
Net Carrying Amount - Finite-Lived Intangible 0   0   0
Industrial [Member]          
Finite-Lived Intangible Assets [Line Items]          
Intangible Assets, Gross (Excluding Goodwill), Total 644,429   644,429   84,646
Accumulated Amortization of Finite-Lived Intangible (78,654)   (78,654)   (71,315)
Intangible Assets, Net (Excluding Goodwill), Total 565,775   565,775   13,331
Industrial [Member] | Trade Names [Member]          
Finite-Lived Intangible Assets [Line Items]          
Indefinite-Lived Intangible Assets 64,248   64,248    
Industrial [Member] | Process Technology [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Value - Finite-Lived Intangible 95,217   95,217   22,950
Accumulated Amortization of Finite-Lived Intangible (19,139)   (19,139)   (17,756)
Net Carrying Amount - Finite-Lived Intangible 76,078   76,078   5,194
Industrial [Member] | Customer Relationships [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Value - Finite-Lived Intangible 422,948   422,948   40,962
Accumulated Amortization of Finite-Lived Intangible (35,198)   (35,198)   (34,407)
Net Carrying Amount - Finite-Lived Intangible 387,750   387,750   6,555
Industrial [Member] | Intellectual Property [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Value - Finite-Lived Intangible 19,480   19,480   19,422
Accumulated Amortization of Finite-Lived Intangible (18,527)   (18,527)   (18,196)
Net Carrying Amount - Finite-Lived Intangible 953   953   1,226
Industrial [Member] | Backlog [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Value - Finite-Lived Intangible 40,885   40,885    
Accumulated Amortization of Finite-Lived Intangible (4,579)   (4,579)    
Net Carrying Amount - Finite-Lived Intangible 36,306   36,306    
Industrial [Member] | Other Intangibles [Member]          
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Value - Finite-Lived Intangible 1,651   1,651   1,312
Accumulated Amortization of Finite-Lived Intangible (1,211)   (1,211)   (956)
Net Carrying Amount - Finite-Lived Intangible $ 440   $ 440   $ 356