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Derivative Financial Instruments (Tables) | 6 Months Ended
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Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Fair Value of Derivative Instruments | Presented below in tabular form is information on the location and amounts of derivative fair values in the Consolidated Condensed Balance Sheets and derivative gains and losses in the Consolidated Condensed Statements of Income: Fair Value of Derivative Instruments September 30, 2018 and March 31, 2018
|  | Derivatives and Hedging Activities Designated as Cash Flow Hedges |  | Derivatives and Hedging Activities Not Designated as Hedging Instruments
|  | September 30, 2018 |  | March 31, 2018 |  | September 30, 2018 |  | March 31, 2018
Prepaid and other current assets |  |  |  |  |  |  |  |
Foreign currency forward contracts |  | $ | — |  |  | $ | 209 |  |  | $ | — |  |  | $ | — |
Total assets |  | $ | — |  |  | $ | 209 |  |  | $ | — |  |  | $ | — |
Accrued expenses |  |  |  |  |  |  |  |
Lead forward contracts |  | $ | 4,032 |  |  | $ | 3,877 |  |  | $ | — |  |  | $ | — |
Foreign currency forward contracts |  | 71 |  |  | — |  |  | 50 |  |  | 187 |
Total liabilities |  | $ | 4,103 |  |  | $ | 3,877 |  |  | $ | 50 |  |  | $ | 187 |
The Effect Of Derivative Instruments On Consolidated Condensed Statements Of Income | The Effect of Derivative Instruments on the Consolidated Condensed Statements of Income For the quarter ended September 30, 2018
Derivatives Designated as Cash Flow Hedges |  | Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) |  | Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion) |  | Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Lead forward contracts |  | $ | (11,524 | ) |  | Cost of goods sold |  | $ | (3,742 | )
Foreign currency forward contracts |  | 138 |  |  | Cost of goods sold |  | 434 |
Total |  | $ | (11,386 | ) |  |  |  | $ | (3,308 | )
Derivatives Not Designated as Hedging Instruments | Location of Gain (Loss) Recognized in Income on Derivatives |  | Pretax Gain (Loss)
Foreign currency forward contracts | Other (income) expense, net |  | $ | 96 |
Total |  |  | $ | 96 |
The Effect of Derivative Instruments on the Consolidated Condensed Statements of Income For the quarter ended October 1, 2017
Derivatives Designated as Cash Flow Hedges |  | Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) |  | Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion) |  | Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Lead forward contracts |  | $ | 3,896 |  |  | Cost of goods sold |  | $ | (1,892 | )
Foreign currency forward contracts |  | (1,029 | ) |  | Cost of goods sold |  | (1,067 | )
Total |  | $ | 2,867 |  |  |  |  | $ | (2,959 | )
Derivatives Not Designated as Hedging Instruments | Location of Gain (Loss) Recognized in Income on Derivatives |  | Pretax Gain (Loss)
Foreign currency forward contracts | Other (income) expense, net |  | $ | (36 | )
Total |  |  | $ | (36 | )
The Effect of Derivative Instruments on the Consolidated Condensed Statements of Income For the six months ended September 30, 2018
Derivatives Designated as Cash Flow Hedges |  | Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) |  | Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion) |  | Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Lead forward contracts |  | $ | (11,009 | ) |  | Cost of goods sold |  | $ | (2,719 | )
Foreign currency forward contracts |  | 720 |  |  | Cost of goods sold |  | (803 | )
Total |  | $ | (10,289 | ) |  |  |  | $ | (3,522 | )
Derivatives Not Designated as Hedging Instruments | Location of Gain (Loss) Recognized in Income on Derivative |  | Pretax Gain (Loss)
Foreign currency forward contracts | Other (income) expense, net |  | $ | (622 | )
Total |  |  | $ | (622 | )
The Effect of Derivative Instruments on the Consolidated Condensed Statements of Income For the six months ended October 1, 2017
Derivatives Designated as Cash Flow Hedges |  | Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) |  | Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion) |  | Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Lead forward contracts |  | $ | 3,082 |  |  | Cost of goods sold |  | $ | (89 | )
Foreign currency forward contracts |  | (3,088 | ) |  | Cost of goods sold |  | (903 | )
Total |  | $ | (6 | ) |  |  |  | $ | (992 | )
Derivatives Not Designated as Hedging Instruments | Location of Gain (Loss) Recognized in Income on Derivative |  | Pretax Gain (Loss)
Foreign currency forward contracts | Other (income) expense, net |  | $ | 12 |
Total |  |  | $ | 12 |

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- Definition Schedule of Derivative Instruments Effect on Other Comprehensive Income Loss and Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) Reclassified to Earnings [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41620-113959 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41638-113959 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41641-113959 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579240-113959 + Details
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