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Debt (Details Narrative)
SFr in Thousands, $ in Thousands
6 Months Ended
Apr. 24, 2015
USD ($)
Oct. 01, 2012
USD ($)
Oct. 01, 2012
CHF (SFr)
Sep. 30, 2017
USD ($)
Customer
Sep. 30, 2017
CHF (SFr)
Apr. 01, 2017
USD ($)
Oct. 01, 2012
CHF (SFr)
Issuance costs       $ (3,680)   $ (4,392)  
Schaublin [Member]              
Land and building leased   $ 9,857          
Mortgage loan interest rate   2.90% 2.90%        
Cash paid for purchase price   $ 5,053          
Mortgage loan       7,158      
Switzerland, Francs [Member] | Schaublin [Member]              
Land and building leased | SFr             SFr 9,300
Cash paid for purchase price | SFr     SFr 4,767        
Mortgage loan | SFr         SFr 6,975    
Land and Building [Member]              
Land and building leased   $ 14,910          
Period for fixed rate on mortgage loan   20 years 20 years        
Land and Building [Member] | Switzerland, Francs [Member]              
Land and building leased | SFr             SFr 14,067
Revolving Credit Facility [Member] | Letter of Credit [Member]              
Letters of credit       3,840      
Maximum borrowing capacity       $ 305,660      
New Credit Agreement [Member] | Minimum [Member]              
Consolidated net debt adjusted EBITDA ratio | Customer       1      
Consolidated Interest Coverage Ratio | Customer       1      
New Credit Agreement [Member] | Maximum [Member]              
Consolidated net debt adjusted EBITDA ratio | Customer       3.50      
Consolidated Interest Coverage Ratio | Customer       2.75      
Sargent Aerospace Defense Business [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Description of variable rate basis      

(a) a base rate determined by reference to the higher of (1) Wells Fargo’s prime lending rate, (2) the federal funds effective rate plus 1/2 of 1% and (3) the one-month LIBOR rate plus 1% or (b) LIBOR rate plus a specified margin.

     
Basis spread on variable rate       1.00%      
Sargent Aerospace Defense Business [Member] | Base Rate [Member]              
Basis spread on variable rate       0.00%      
Sargent Aerospace Defense Business [Member] | New Credit Agreement [Member]              
Debt maturity date Apr. 24, 2020            
Issuance costs       $ 3,680      
Original amount       7,122      
Sargent Aerospace Defense Business [Member] | New Credit Agreement [Member] | Revolving Credit Facility [Member]              
Face amount $ 350,000            
Outstanding amount       40,500      
Sargent Aerospace Defense Business [Member] | New Credit Agreement [Member] | Term Loan [Member]              
Face amount $ 200,000            
Outstanding amount       $ 176,250