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Note 13 Stock-Based Compensation
 6 Months Ended
Apr. 03, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Share-based Payment Arrangement [Text Block] Stock-Based Compensation
Stock-based compensation expense was attributable to:
Three Months EndedSix Months Ended
April 3,
2021		March 28,
2020		April 3,
2021		March 28,
2020
(In thousands)
Stock options$— $— $— $(1,145)
Restricted stock units, including performance based awards9,224 7,783 17,432 15,834 
  Total$9,224 $7,783 $17,432 $14,689 

Stock-based compensation expense was recognized as follows:
Three Months EndedSix Months Ended
April 3,
2021		March 28,
2020		April 3,
2021		March 28,
2020
(In thousands)
Cost of sales$3,629 $2,582 $7,050 $5,494 
Selling, general and administrative5,479 5,127 10,196 9,052 
Research and development116 74 186 143 
  Total$9,224 $7,783 $17,432 $14,689 

During the second quarter of 2021, the Company's stockholders approved the reservation of an additional 1.4 million shares of common stock for future issuance under the Company's 2019 Incentive Plan. As of April 3, 2021, an aggregate of 8.0 million shares were authorized for future issuance under the Company's stock plans, of which 4.2 million of such shares were issuable upon exercise of outstanding options and delivery of shares upon vesting of restricted stock units and 3.8 million shares of common stock were available for future grant.

Restricted and Performance Stock Units

The Company grants restricted stock units and restricted stock units with performance conditions ("PSUs") to executive officers, directors and certain other employees. These units vest over periods ranging from one year to four years and/or upon achievement of specified performance criteria and are automatically exchanged for shares of common stock at the
vesting date. If performance metrics are not met within specified time limits, the award will be canceled. Compensation expense associated with restricted stock units and PSUs is recognized ratably over the vesting period, subject to probability of achievement for PSUs.

During 2021 and 2020, the Company granted 373,000 and 304,500 PSU shares, respectively, for which vesting is contingent on cumulative non-GAAP earnings per share measured over three fiscal years. If a minimum threshold is not achieved, no shares will vest. If the minimum threshold is achieved or exceeded, the number of shares of common stock that will be issued will range from 80% to 120% of the number of PSUs granted, depending on the extent of performance. Additionally, the number of shares that vest may be adjusted up or down by up to 15% based on the Company's total shareholder return relative to that of its peer group over this same period. These PSUs will be cancelled if such performance conditions have not been met during the measurement period.
    
Activity with respect to the Company's restricted stock awards was as follows:
Number of
Shares		Weighted-
Average Grant Date
Fair Value
($)		Weighted-
Average
Remaining
Contractual
Term
(Years)		Aggregate
Intrinsic
Value
($)
(In thousands)(In thousands)
Outstanding as of October 3, 20202,568 29.67 1.2371,571 
Granted1,444 33.92 
Vested/Forfeited/Cancelled(698)29.31 
Outstanding as of April 3, 20213,314 31.61 1.56135,998 
Expected to vest as of April 3, 20212,870 31.46 1.51117,798 
As of April 3, 2021, unrecognized compensation expense of $63 million is expected to be recognized over a weighted average period of 1.5 years. Additionally, as of April 3, 2021, unrecognized compensation expense related to performance-based restricted stock units for which achievement of the performance criteria was not currently considered probable is $3 million.