Annual report pursuant to Section 13 and 15(d)

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

v2.4.0.8
The Company and Its Accounting Policies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Schedule Of Accounting Policies [Line Items]      
Company recognizes planned manufacturing process 28 days    
Direct labor hours worked on contracts 0 days 575 hours    
Minimum level of likelihood 50.00%    
Research and development costs $ 3,436 $ 3,579 $ 3,197
Antidilutive securities excluded from computation of earnings per share 2 14 14
Interest paid 12 59 100
Income taxes paid 3,302 4,064 8,111
Pension and other postretirement benefit adjustments, net of tax (2,275) (92) 3,223
Issuance of treasury stock 317 297 330
Capital expenditures 40 142 13
Capital leases $ 90 $ 11 $ 205
Buildings and Leasehold Improvements [Member]
      
Schedule Of Accounting Policies [Line Items]      
Estimated useful lives range 40 years    
Backlog [Member]
      
Schedule Of Accounting Policies [Line Items]      
Estimated useful lives 6 months    
Customer Relationships [Member]
      
Schedule Of Accounting Policies [Line Items]      
Estimated useful lives 15 years    
Minimum [Member]
      
Schedule Of Accounting Policies [Line Items]      
Substantial completion of manufacturing process 95.00%    
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]      
Investment maturity date range end Oct. 03, 2014    
Treasury with original maturities period 1 year    
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