Annual report pursuant to Section 13 and 15(d)

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

v3.19.1
The Company and Its Accounting Policies - Additional Information (Detail) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Apr. 01, 2019
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Schedule Of Accounting Policies [Line Items]        
Minimum level of likelihood   50.00%    
Description of sale of asset   The sale of the asset (disposal group) is probable, and transfer of the asset (disposal group) is expected to qualify for recognition as a completed sale within one year, except if events or circumstances beyond the Company's control extend the period of time required to sell the asset (disposal group) beyond one year;    
Research and development costs   $ 3,538 $ 3,211 $ 3,863
Antidilutive securities excluded from computation of earnings per share   39 69 11
Interest paid   $ 12 $ 12 $ 10
Income taxes paid (refunded)   (73) 1,916 951
Pension and other postretirement benefit adjustments, net of tax   348 (1,668) (2,493)
Issuance of treasury stock   134 130 241
Capital expenditures   85 0 4
Capital leases   100 0 95
Retained earnings   93,847 99,011  
Reclassification of net benefit income   $ (823) (478) (10)
Topic 842 [Member] | Subsequent Event [Member]        
Schedule Of Accounting Policies [Line Items]        
Right-of-use assets $ 700      
Lease liabilities 750      
Retained earnings 80      
Decrease in other current assets 50      
Decrease in deferred income tax liability 20      
Topic 842 [Member] | Subsequent Event [Member] | Held for Sale [Member]        
Schedule Of Accounting Policies [Line Items]        
Right-of-use assets 500      
Lease liabilities $ 500      
ASU 2017-07 [Member] | Cost of Products Sold [Member]        
Schedule Of Accounting Policies [Line Items]        
Reclassification of net benefit income     $ 355 $ 4
Reclassification of net benefit income [Extensible List]     us-gaap:OtherIncomeMember us-gaap:OtherIncomeMember
ASU 2017-07 [Member] | Selling, General and Administrative Expense [Member]        
Schedule Of Accounting Policies [Line Items]        
Reclassification of net benefit income     $ 123 $ 6
Reclassification of net benefit income [Extensible List]     us-gaap:OtherIncomeMember us-gaap:OtherIncomeMember
Retained Earnings [Member]        
Schedule Of Accounting Policies [Line Items]        
Amounts reclassified from accumulated other comprehensive loss to retained earnings     $ 1,828  
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   Sep. 25, 2019    
Maximum [Member] | Topic 842 [Member]        
Schedule Of Accounting Policies [Line Items]        
Lease term   12 months    
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