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Stock Ownership Plans (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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