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Acquisition - Honeywell Asset Purchase and License Agreement - Additional Information (Detail)
 12 Months Ended
Sep. 28, 2017
USD ($)
Aircraft
Jan. 31, 2019
USD ($)
$ / shares
Jan. 31, 2018
USD ($)
Business Acquisition [Line Items]      
Initial upfront payment in cash   $ 400,000 $ 14,873,000
Current Portion of Royalty Obligation   1,875,000 1,625,000
Royalty obligation reported as long-term liability   9,916,000 11,760,000
Guaranteed minimum royalty payment   1,900,000  
Current Liability -Excess Royalty Payment Due   1,265,000 615,000
Honeywell Asset Purchase and License Agreement [Member]      
Business Acquisition [Line Items]      
Number of aircraft families | Aircraft 2    
Initial upfront payment in cash   400,000  
Minimum royalty payment term 10 years    
Minimum royalty payments $ 15,000,000    
Present value factor 2.80%    
Current Portion of Royalty Obligation   1,875,000  
Royalty obligation reported as long-term liability   9,916,000  
Excess royalty expense   2,800,000 $ 600,000
Increase in operating income   400,000  
Increase in operating income net of tax   $ 300,000  
Increase in net income per common share-diluted | $ / shares   $ 0.05  
Transaction cost   $ 300,000  
Internal rate of return 21.00%    
Amortization period of intangibles 10 years    
Honeywell Asset Purchase and License Agreement [Member] | Minimum [Member] | Intangible Assets [Member]      
Business Acquisition [Line Items]      
Fair value assumptions, Annual earnings projections $ 3,900,000    
Honeywell Asset Purchase and License Agreement [Member] | Maximum [Member] | Intangible Assets [Member]      
Business Acquisition [Line Items]      
Fair value assumptions, Annual earnings projections 5,400,000    
Honeywell Asset Purchase and License Agreement [Member] | Amended Credit Agreement with Bank Of America [Member] | Revolving Credit Facility [Member]      
Business Acquisition [Line Items]      
Initial upfront payment in cash $ 14,600,000    
Transition Services Agreement [Member]      
Business Acquisition [Line Items]      
Increase in operating income   1,000,000  
Increase in operating income net of tax   $ 800,000  
Increase in net income per common share-diluted | $ / shares   $ 0.12