Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Assets:
Money-market funds	$ 1,462,683	$ 1,485,555
Non-qualified deferred compensation asset	22,845	16,967
Total assets measured at fair value	1,493,214	1,504,760
Liabilities:
Non-qualified deferred compensation liability	(2,407)	(2,345)
Non-qualified deferred compensation liability	(29,291)	(22,793)
Total liabilities measured at fair value	(31,698)	(25,202)
Designated Derivative Contracts
Assets:
Derivative contract assets	7,316	2,163
Liabilities:
Designated Derivative Contracts liability		(64)
Non-Designated Derivative Contracts
Assets:
Derivative contract assets	370	75
Level 1
Assets:
Money-market funds	1,462,683	1,485,555
Non-qualified deferred compensation asset	22,845	16,967
Total assets measured at fair value	1,485,528	1,502,522
Liabilities:
Non-qualified deferred compensation liability	(2,407)	(2,345)
Non-qualified deferred compensation liability	(29,291)	(22,793)
Total liabilities measured at fair value	(31,698)	(25,138)
Level 1 | Designated Derivative Contracts
Assets:
Derivative contract assets	0	0
Liabilities:
Designated Derivative Contracts liability		0
Level 1 | Non-Designated Derivative Contracts
Assets:
Derivative contract assets	0	0
Level 2
Assets:
Money-market funds	0	0
Non-qualified deferred compensation asset	0	0
Total assets measured at fair value	7,686	2,238
Liabilities:
Non-qualified deferred compensation liability	0	0
Non-qualified deferred compensation liability	0	0
Total liabilities measured at fair value	0	(64)
Level 2 | Designated Derivative Contracts
Assets:
Derivative contract assets	7,316	2,163
Liabilities:
Designated Derivative Contracts liability		(64)
Level 2 | Non-Designated Derivative Contracts
Assets:
Derivative contract assets	370	75
Level 3
Assets:
Money-market funds	0	0
Non-qualified deferred compensation asset	0	0
Total assets measured at fair value	0	0
Liabilities:
Non-qualified deferred compensation liability	0	0
Non-qualified deferred compensation liability	0	0
Total liabilities measured at fair value	0	0
Level 3 | Designated Derivative Contracts
Assets:
Derivative contract assets	0	0
Liabilities:
Designated Derivative Contracts liability		0
Level 3 | Non-Designated Derivative Contracts
Assets:
Derivative contract assets	$ 0	$ 0