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Fair Value Measurements (Tables) | 6 Months Ended
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Sep. 30, 2024
Fair Value Disclosures [Abstract] |
Financial Assets And Liabilities Measured At Fair Value On Recurring Basis [Table Text Block] | At September 30, 2024 and 2023, and at March 31, 2024, the Company had certain financial assets and financial liabilities that were required to be measured and reported at fair value on a recurring basis. These assets and liabilities are listed in the tables below and are classified based on how their values were determined under the fair value hierarchy or the NAV practical expedient:
|  | September 30, 2024
|  |  |  | Fair Value Hierarchy |  |
(in thousands of dollars) |  | NAV |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 148 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 148 |
Trading securities associated with deferred compensation plans |  | — |  |  | 12,376 |  |  | — |  |  | — |  |  | 12,376 |
Foreign currency exchange contracts |  | — |  |  | — |  |  | 144 |  |  | — |  |  | 144 |
Total financial assets measured and reported at fair value |  | $ | 148 |  |  | $ | 12,376 |  |  | $ | 144 |  |  | $ | — |  |  | $ | 12,668 |
Liabilities |  |  |  |  |  |  |  |  |  |
Interest rate swap agreements |  | $ | — |  |  | $ | — |  |  | $ | 2,629 |  |  | $ | — |  |  | $ | 2,629 |
Foreign currency exchange contracts |  | — |  |  | — |  |  | 6,970 |  |  | — |  |  | 6,970 |
Total financial liabilities measured and reported at fair value |  | $ | — |  |  | $ | — |  |  | $ | 9,599 |  |  | $ | — |  |  | $ | 9,599 |
|  | September 30, 2023
|  |  |  | Fair Value Hierarchy |  |
(in thousands of dollars) |  | NAV |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 145 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 145 |
Trading securities associated with deferred compensation plans |  | — |  |  | 11,238 |  |  | — |  |  | — |  |  | 11,238 |
Interest rate swap agreements |  | — |  |  | — |  |  | 12,361 |  |  | — |  |  | 12,361 |
Foreign currency exchange contracts |  | — |  |  | — |  |  | 1,081 |  |  | — |  |  | 1,081 |
Total financial assets measured and reported at fair value |  | $ | 145 |  |  | $ | 11,238 |  |  | $ | 13,442 |  |  | $ | — |  |  | $ | 24,825 |
Liabilities |  |  |  |  |  |  |  |  |  |
Foreign currency exchange contracts |  | $ | — |  |  | $ | — |  |  | $ | 14 |  |  | $ | — |  |  | $ | 14 |
Total financial liabilities measured and reported at fair value |  | $ | — |  |  | $ | — |  |  | $ | 14 |  |  | $ | — |  |  | $ | 14 |
|  | March 31, 2024
|  |  |  | Fair Value Hierarchy |  |
(in thousands of dollars) |  | NAV |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 145 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 145 |
Trading securities associated with deferred compensation plans |  | — |  |  | 12,409 |  |  | — |  |  | — |  |  | 12,409 |
Interest rate swap agreements |  | — |  |  | — |  |  | 6,706 |  |  | — |  |  | 6,706 |
Foreign currency exchange contracts |  | — |  |  | — |  |  | 322 |  |  | — |  |  | 322 |
Total financial assets measured and reported at fair value |  | $ | 145 |  |  | $ | 12,409 |  |  | $ | 7,028 |  |  | $ | — |  |  | $ | 19,582 |
Liabilities |  |  |  |  |  |  |  |  |  |
Foreign currency exchange contracts |  | $ | — |  |  | $ | — |  |  | $ | 21 |  |  | $ | — |  |  | $ | 21 |
Total financial liabilities measured and reported at fair value |  | $ | — |  |  | $ | — |  |  | $ | 21 |  |  | $ | — |  |  | $ | 21 |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] | The following table summarizes the fair and carrying value of the Company’s long-term debt, and if applicable any current portion, at each of the balance sheet dates September 30, 2024, and 2023 and March 31, 2024:
(in millions of dollars) | September 30, 2024 |  | September 30, 2023 |  | March 31, 2024
Fair market value of long term obligations | $ | 615 |  |  | $ | 615 |  |  | $ | 618 |
Carrying value of long term obligations | $ | 620 |  |  | $ | 620 |  |  | $ | 620 |

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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