CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2026	Jun. 30, 2025
Statement of Cash Flows [Abstract]
Net Income	$ 201,000	$ 178,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, and amortization	123,800	119,400
Deferred income taxes	600	0
Share-based compensation expense	12,800	11,900
Other items	11,200	14,500
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable, net	90,000	119,200
Inventories, net	(73,300)	(42,500)
Other current assets	(8,000)	18,900
Accounts payable	4,300	9,800
Accruals and other, net	4,800	(9,200)
Net cash provided by operating activities	367,100	420,000
Investing activities:
Purchases of property, plant, equipment, and intangibles	(87,500)	(93,600)
Proceeds from the sale of property, plant, equipment, and intangibles	0	100
Purchase of investments	(5,000)	0
Acquisition of businesses, net of cash acquired	(16,000)	(15,000)
Net cash used in investing activities	(108,500)	(108,500)
Financing activities:
Payments on Private Placement Senior Notes	0	(125,000)
Payments under credit facilities, net	(37,800)	(30,500)
Acquisition related deferred or contingent consideration	(100)	(100)
Repurchases of ordinary shares	(115,500)	(10,600)
Cash dividends paid to ordinary shareholders	(61,400)	(56,200)
Stock option and other equity transactions, net	1,300	9,300
Net cash used in financing activities	(213,500)	(213,100)
Effect of exchange rate changes on cash and cash equivalents	(2,300)	9,600
Increase in cash and cash equivalents	42,800	108,000
Cash and cash equivalents at beginning of period	439,600	171,700
Cash and cash equivalents at end of period	$ 482,300	$ 279,700