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Segment Information - Net Sales and Gross Profit (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment reporting information [Line Items]
Net Sales	$ 2,254.3	$ 2,073.2	$ 4,542.9	$ 4,036.8
Gross Profit	1,527.4	1,397.9	3,085.8	2,707.8
Semiconductor products
Segment reporting information [Line Items]
Net Sales	2,227.7	2,028.2	4,482.5	3,953.9
Gross Profit	1,500.8	1,352.9	3,025.4	2,624.9
Technology licensing
Segment reporting information [Line Items]
Net Sales	26.6	45.0	60.4	82.9
Gross Profit	$ 26.6	$ 45.0	$ 60.4	$ 82.9

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