Stockholder's Equity (Tables)

6 Months Ended

Mar. 29, 2019

Stockholders' Equity Note [Abstract]

Dividends Declared

Schedule of share-based compensation expense

The following table summarizes the share-based compensation expense by line item in the Statements of Operations (in millions):

	Three Months Ended				Six Months Ended
	March 29, 2019		March 30, 2018		March 29, 2019		March 30, 2018
Cost of goods sold	$	3.3	$	4.2	$	6.9	$	8.3
Research and development	9.9		14.5		22.4		25.7
Selling, general and administrative	8.6		22.3		13.3		32.8
Total share-based compensation	$	21.8	$	41.0	$	42.6	$	66.8