Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
The Company and Its Accounting Policies - Additional Information (Detail) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Apr. 01, 2018
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
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   $ 1,124 $ 971  
Substantial completion of manufacturing process   95.00%    
Minimum level of likelihood   50.00%    
Research and development costs   $ 3,211 $ 3,863 $ 3,746
Antidilutive securities excluded from computation of earnings per share   69 11 54
Interest paid   $ 12 $ 10 $ 10
Income taxes paid   1,916 951 5,423
Pension and other postretirement benefit adjustments, net of tax   (1,668) (2,493) 1,470
Reclassification from accumulated other comprehensive loss to retaIned earnings   1,828    
Issuance of treasury stock   130 241 255
Capital expenditures   0 4 53
Capital leases   0 $ 95 $ 126
ASU 2018-02 [Member]        
Schedule Of Accounting Policies [Line Items]        
Reclassification from accumulated other comprehensive loss to retaIned earnings   $ 1,828    
Subsequent Event [Member] | ASU 2014-09 [Member]        
Schedule Of Accounting Policies [Line Items]        
Change in accounting principle cumulative-effect of amended as a decrease to opening balance of retained earnings $ 1,000      
Delay in recognizing net sales $ 5,000      
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   Jul. 18, 2018    
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