Fair Value Measurements (Tables)

6 Months Ended

Sep. 30, 2025

Financial Assets And Liabilities Measured At Fair Value On Recurring Basis [Table Text Block]

At September 30, 2025 and 2024, and at March 31, 2025, 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, 2025
			Fair Value Hierarchy
(in thousands of dollars)	NAV		Level 1		Level 2		Level 3		Total

Assets
Money market funds	$	149	$	—	$	—	$	—	$	149
Trading securities associated with deferred compensation plans	—		12,303		—		—		12,303

Foreign currency exchange contracts	—		—		660		—		660
Total financial assets measured and reported at fair value	$	149	$	12,303	$	660	$	—	$	13,112

Liabilities



Interest rate swap agreements	$	—	$	—	$	1,035	$	—	$	1,035
Foreign currency exchange contracts	—		—		819		—		819
Total financial liabilities measured and reported at fair value	$	—	$	—	$	1,854	$	—	$	1,854


	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


	March 31, 2025
			Fair Value Hierarchy
(in thousands of dollars)	NAV		Level 1		Level 2		Level 3		Total

Assets
Money market funds	$	149	$	—	$	—	$	—	$	149
Trading securities associated with deferred compensation plans	—		11,313		—		—		11,313
Interest rate swap agreements	—		—		1,783		—		1,783
Foreign currency exchange contracts	—		—		302		—		302
Total financial assets measured and reported at fair value	$	149	$	11,313	$	2,085	$	—	$	13,547

Liabilities




Foreign currency exchange contracts	$	—	$	—	$	6,668	$	—	$	6,668
Total financial liabilities measured and reported at fair value	$	—	$	—	$	6,668	$	—	$	6,668

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, 2025, and 2024 and March 31, 2025:


(in millions of dollars)	September 30, 2025		September 30, 2024		March 31, 2025
Fair market value of long term obligations	$	619	$	615	$	616
Carrying value of long term obligations	$	620	$	620	$	620