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Other Operating Income and Expenses (detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |
Gain from plant closing |  |  | $ 5.0
Loss On Sale Of Other Assets | $ 0.2 |  |
Gain (Loss) on Disposition of Assets |  | $ 0.4 | 0.1
Environmental Remediation Expense |  | 0.1 | $ 0.3
Relationship transfer agreement |  | 24.3 |
Prop 65 litigation settlement |  | $ 0.2 |
Roof Collapse Expneses | 1.2 |  |
Goodwill Impairment Loss | $ 1.1 |  |

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