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Stock Ownership Plans (Tables)
 12 Months Ended
Sep. 24, 2017
Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of stock option activity is as follows:
(Thousands of Shares)
2017

 
2016

 
2015

 
 
 
 
 
 
Under option, beginning of year
1,698

 
1,871

 
2,333

Exercised
(339
)
 
(74
)
 
(289
)
Canceled
(88
)
 
(99
)
 
(173
)
Under option, end of year
1,271

 
1,698

 
1,871

Exercisable, end of year
1,271

 
1,692

 
1,840
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block]
Weighted average prices of stock options are as follows:
(Dollars)
2017

 
2016

 
2015

 
 
 
 
 
 
Exercised
1.53

 
1.17

 
1.27

Cancelled
14.02

 
8.78

 
5.02

Under option, end of year
1.86

 
2.42

 
2.71
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block]
A summary of stock options outstanding at September 24, 2017 is as follows:
(Dollars)
Options Outstanding
 
 
Options Exercisable
 
Range of
Exercise
Prices
Number
Outstanding (Thousands)

Weighted Average
Remaining Contractual
Life (Years)
 
Weighted
Average
Exercise Price

 
Number
Exercisable  (Thousands)

 
Weighted
Average
Exercise Price

 
 
 
 
 
 
 
 
 
1 - 2
569

4.7
 
1.14

 
569

 
1.14

2 - 3
702

2.8
 
2.44

 
702

 
2.44

 
1,271

3.6
 
1.86

 
1,271

 
1.86
Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of restricted Common Stock activity follows:
(Thousands of Shares)
2017

 
2016

 
2015

 
 
 
 
 
 
Outstanding, beginning of year
2,462

 
1,546

 
1,291

Granted
837

 
1,018

 
786

Vested
(751
)
 
(63
)
 
(500
)
Forfeited
(70
)
 
(39
)
 
(31
)
Outstanding, end of year
2,478

 
2,462

 
1,546
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block]
Weighted average grant date fair values of restricted Common Stock are as follows:
(Dollars)
2017

 
2016

 
2015

 
 
 
 
 
 
Outstanding, beginning of year
2.74

 
3.62

 
2.72

Granted
3.34

 
1.49

 
3.62

Vested
3.59

 
3.39

 
1.31

Forfeited
2.98

 
3.31

 
3.62

Outstanding, end of year
2.69

 
2.74

 
3.62