Revenue Recognition (Performance Obligation) (Details) $ in Millions	9 Months Ended
	Jun. 25, 2021 USD ($) country
Revenue from Contract with Customer [Abstract]
Performance obligation, description of timing	one year or less
Remaining performance obligation | $	$ 39.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Countries technologies are licensed in | country	60
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-06-26
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected timing of satisfaction period	6 months
Remaining performance obligation, percent	18.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-09-25
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected timing of satisfaction period	1 year
Remaining performance obligation, percent	33.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected timing of satisfaction period	1 year
Remaining performance obligation, percent	49.00%