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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 |  |

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