Geographic and Segment Information (Tables)

12 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Schedule of Revenues and Gross Profit for Each Segment

The following table represents revenues and gross profit for each segment (amounts in millions):

	Years ended March 31,
	2018				2017				2016
	Net Sales		Gross Profit		Net Sales		Gross Profit		Net Sales		Gross Profit
Semiconductor products	$	3,876.0	$	2,315.9	$	3,316.6	$	1,666.0	$	2,084.2	$	1,116.4
Technology licensing	104.8		104.8		91.2		91.2		89.1		89.1
Total	$	3,980.8	$	2,420.7	$	3,407.8	$	1,757.2	$	2,173.3	$	1,205.5

Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country

Identifiable long-lived assets (consisting of property, plant and equipment net of accumulated amortization) by geographic area are as follows (amounts in millions):

	March 31,
	2018		2017
United States	$	393.3	$	388.5
Thailand	215.5		178.0
Various other countries	159.1		116.8
Total long-lived assets	$	767.9	$	683.3