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Significant Accounting Policies (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2017
Acquired Indefinite-lived Intangible Assets [Line Items]          
Business base percentage, prime contracts 95.00%   95.00%    
Business base percentage, subcontracts 5.00%   5.00%    
Goodwill, net $ 25,989,000   $ 25,989,000   $ 25,989,000
Goodwill impairment         0
Uncertain tax positions 0   0   $ 0
Income tax interest expense 0 $ 0      
Income tax penalties     0 $ 0  
Cash, FDIC insured amount $ 250,000,000   $ 250,000,000    
Employee Stock Option          
Acquired Indefinite-lived Intangible Assets [Line Items]          
Number of awards authorized for issuance (in shares) 0   0    
Expiration term of share-based compensation plan     10 years    
Employee Stock Option | Long Term Incentive Plan 2006 [Member]          
Acquired Indefinite-lived Intangible Assets [Line Items]          
Number of awards authorized for issuance (in shares) 0   0    
Expiration term of share-based compensation plan     10 years    
Minimum          
Acquired Indefinite-lived Intangible Assets [Line Items]          
Estimated useful of long-lived assets     3 years    
Maximum          
Acquired Indefinite-lived Intangible Assets [Line Items]          
Estimated useful of long-lived assets     7 years