Annual report pursuant to Section 13 and 15(d)

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

v3.21.1
The Company and Its Accounting Policies - Additional Information (Detail) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Schedule Of Accounting Policies [Line Items]      
Minimum level of likelihood 50.00%    
Research and development costs $ 3,367 $ 3,353 $ 3,538
Antidilutive securities excluded from computation of earnings per share 37   39
Interest paid $ 11 12 $ 12
Income taxes paid (refunded) 200 139 (73)
Pension and other postretirement benefit income (loss) adjustments, net of tax 1,774 (525) (348)
Issuance of treasury stock 222 170 134
Capital expenditures 173 162 85
Capital leases $ 0 $ 0 $ 100
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 3 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 Jun. 24, 2021    
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