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Goodwill and Other Intangible Assets - Goodwill Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2017
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Goodwill [Line Items]        
Goodwill $ 319,390 $ 334,640   $ 316,650
Aerospace Reporting Unit [Member]        
Goodwill [Line Items]        
Goodwill     $ 133,700  
Machined Products Reporting Unit [Member]        
Goodwill [Line Items]        
Goodwill     $ 12,700  
Goodwill [Member] | Aerospace Reporting Unit [Member]        
Goodwill [Line Items]        
Fair Value Inputs, Valuation Method, Weighting Percentage Used, Income-Based Approach 50.00%      
Fair Value Inputs, Valuation Method, Weighting Percentage Used, Market-Based Approach 50.00%      
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 15.00%   34.00%  
Goodwill [Member] | Machined Products Reporting Unit [Member]        
Goodwill [Line Items]        
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount     13.00%  
Measurement Input, Long-term Revenue Growth Rate [Member] | Goodwill [Member] | Aerospace Reporting Unit [Member]        
Goodwill [Line Items]        
Fair value inputs, valuation method, residual growth rate 3.00%      
Measurement Input, Discount Rate [Member] | Goodwill [Member] | Aerospace Reporting Unit [Member]        
Goodwill [Line Items]        
Fair value inputs, valuation method, discount rate 9.50%