Annual report pursuant to Section 13 and 15(d)

The Company and Its Accounting Policies - Additional Information (Detail)

v3.6.0.2
The Company and Its Accounting Policies - Additional Information (Detail) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Schedule Of Accounting Policies [Line Items]      
Company recognizes planned manufacturing process 28 days    
Direct labor hours worked on contracts 575 hours    
Receivables billed but not paid under retainage provisions in its customer contracts $ 2,071 $ 1,751  
Substantial completion of manufacturing process 95.00%    
Minimum level of likelihood 50.00%    
Research and development costs $ 3,746 $ 3,585 $ 3,436
Antidilutive securities excluded from computation of earnings per share 54 12 2
Interest paid $ 10 $ 11 $ 12
Income taxes paid 5,423 6,491 3,302
Pension and other postretirement benefit adjustments, net of tax 1,470 3,294 (2,275)
Issuance of treasury stock 255 325 317
Capital expenditures 53 174 40
Capital leases $ 126 $ 22 $ 90
Customer Relationships [Member]      
Schedule Of Accounting Policies [Line Items]      
Estimated useful lives 15 years    
Buildings and Leasehold Improvements [Member]      
Schedule Of Accounting Policies [Line Items]      
Estimated useful lives range 40 years    
Minimum [Member]      
Schedule Of Accounting Policies [Line Items]      
Treasury with original maturities period 3 months    
Minimum [Member] | Office Equipment [Member]      
Schedule Of Accounting Policies [Line Items]      
Estimated useful lives range 5 years    
Minimum [Member] | Manufacturing Equipment [Member]      
Schedule Of Accounting Policies [Line Items]      
Estimated useful lives range 8 years    
Maximum [Member]      
Schedule Of Accounting Policies [Line Items]      
Treasury with original maturities period 1 year    
Investment maturity date range end Feb. 03, 2017    
Maximum [Member] | Office Equipment [Member]      
Schedule Of Accounting Policies [Line Items]      
Estimated useful lives range 8 years    
Maximum [Member] | Manufacturing Equipment [Member]      
Schedule Of Accounting Policies [Line Items]      
Estimated useful lives range 25 years