Accounting and Repoting Changes - Additional Information (Detail) - USD ($) $ in Thousands |
3 Months Ended | |
---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
|
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] | ||
Reclassification of net benefit income | $ 206 | $ 119 |
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 | |
Reclassification of net benefit income [Extensible List] | 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 | $ 88 | |
Reclassification of net benefit income [Extensible List] | us-gaap:OtherIncomeMember |