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Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Financial Assets And (Liabilities), Measured At Fair Value On A Recurring Basis | The following tables represent the financial assets and (liabilities) measured at fair value on a recurring basis as of September 30, 2018 and March 31, 2018, and the basis for that measurement:
|  | Total Fair Value Measurement September 30, 2018 |  | Quoted Price in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Lead forward contracts |  | $ | (4,032 | ) |  | $ | — |  |  | $ | (4,032 | ) |  | $ | — |
Foreign currency forward contracts |  | (121 | ) |  | — |  |  | (121 | ) |  | — |
Total derivatives |  | $ | (4,153 | ) |  | $ | — |  |  | $ | (4,153 | ) |  | $ | — |
|  | Total Fair Value Measurement March 31, 2018 |  | Quoted Price in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Lead forward contracts |  | $ | (3,877 | ) |  | $ | — |  |  | $ | (3,877 | ) |  | $ | — |
Foreign currency forward contracts |  | 22 |  |  | — |  |  | 22 |  |  | — |
Total derivatives |  | $ | (3,855 | ) |  | $ | — |  |  | $ | (3,855 | ) |  | $ | — |
Carrying Amounts And Estimated Fair Values Of Company's Financial Instruments | The carrying amounts and estimated fair values of the Company’s derivatives and Notes at September 30, 2018 and March 31, 2018 were as follows:
|  | September 30, 2018 |  |  |  | March 31, 2018 |  |
|  | Carrying Amount |  |  |  | Fair Value |  |  |  | Carrying Amount |  |  |  | Fair Value |  |
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives (1) |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 22 |  |  |  |  | $ | 22 |  |  |
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes (2) |  | $ | 300,000 |  |  |  |  | $ | 300,000 |  |  |  |  | $ | 300,000 |  |  |  |  | $ | 304,500 |  |  |
Derivatives (1) |  | 4,153 |  |  |  |  | 4,153 |  |  |  |  | 3,877 |  |  |  |  | 3,877 |  |  |
(1) | Represents lead and foreign currency forward contracts (see Note 4 for asset and liability positions of the lead and foreign currency forward contracts at September 30, 2018 and March 31, 2018).
(2) | The fair value amount of the Notes at September 30, 2018 and March 31, 2018 represent the trading value of the instruments.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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