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Geographic and Segment Information - Net Sales and Gross Profit (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Segment reporting information [Line Items]
Net Sales	$ 8,438.7	$ 6,820.9	$ 5,438.4
Gross Profit	5,697.9	4,449.6	3,378.8
Semiconductor products
Segment reporting information [Line Items]
Net Sales	8,277.7	6,698.9	5,335.5
Gross Profit	5,536.9	4,327.6	3,275.9
Technology licensing
Segment reporting information [Line Items]
Net Sales	161.0	122.0	102.9
Gross Profit	$ 161.0	$ 122.0	$ 102.9

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