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Accounting and Repoting Changes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Reclassification of net benefit income | $ 206 | $ 120 | $ 412 | $ 239
ASU 2017-07 [Member] | Selling, General and Administrative Expense [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Reclassification of net benefit income |  | $ 31 |  | $ 62
Reclassification of net benefit income [Extensible List] |  | us-gaap:OtherIncomeMember |  | us-gaap:OtherIncomeMember
ASU 2017-07 [Member] | Cost of Products Sold [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Reclassification of net benefit income |  | $ 89 |  | $ 177
Reclassification of net benefit income [Extensible List] |  | us-gaap:OtherIncomeMember |  | us-gaap:OtherIncomeMember

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- Definition Amount of expense (reversal of expense) for net periodic benefit cost components, excluding service cost component, of defined benefit plan. Amount includes, but is not limited to, interest cost, expected (return) loss on plan asset, amortization of prior service cost (credit), amortization of (gain) loss, amortization of transition (asset) obligation, settlement (gain) loss, curtailment (gain) loss and certain termination benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 + Details
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