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Note 8 - Stock-based Compensation (Tables) | 12 Months Ended
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Sep. 29, 2018
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Year Ended |
|  | Septem ber 29 , |  |  | Septem ber 30 , |  |  | Octo ber 1 , |
|  | 201 8 |  |  | 201 7 |  |  | 201 6 |
Expected term (in years) |  |  | 4.79 |  |  |  | 5.14 |  |  |  | 5.45 |
Risk-free interest rate |  |  | 2.71 | % |  |  | 1.98 | % |  |  | 1.30 | %
Expected volatility |  |  | 37.32 | % |  |  | 38.32 | % |  |  | 39.00 | %
Expected dividend yield |  |  | 0.37 | % |  |  | 0.37 | % |  |  | 0.48 | %
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  |  |  |  |  | Exercise Price |  |  | Contractual |  |  | Aggregate |
|  |  |  |  |  | Per Share |  |  | Term - |  |  | Intrinsic |
|  | Options |  |  |  |  |  |  |  |  | Weighted |  |  | Weighted |  |  | Value |
(Share amounts in thousands) |  | Outstanding |  |  | Range |  |  | Average |  |  | Average (in years) |  |  | (in thousands) |
Outstanding at October 3, 2015 |  |  | 923 |  |  |  | $7.55 | - | $21.96 |  |  | $ | 15.14 |  |  |  |  |  |  |  |  |
Granted |  |  | 99 |  |  |  | 23.95 | - | 34.49 |  |  |  | 28.47 |  |  |  |  |  |  |  |  |
Exercised |  |  | (651 | ) |  |  | 7.55 | - | 21.96 |  |  |  | 13.93 |  |  |  |  |  |  | $ | 8,718 |
Outstanding at October 1, 2016 |  |  | 371 |  |  |  | 9.16 | - | 34.49 |  |  |  | 20.81 |  |  |  |  |  |  |  |  |
Granted |  |  | 88 |  |  |  | 26.75 | - | 37.06 |  |  |  | 30.93 |  |  |  |  |  |  |  |  |
Exercised |  |  | (67 | ) |  |  | 9.16 | - | 23.95 |  |  |  | 19.05 |  |  |  |  |  |  |  | 1,212 |
Outstanding at September 30, 2017 |  |  | 392 |  |  |  | 9.16 | - | 37.06 |  |  |  | 23.40 |  |  |  |  |  |  |  |  |
Granted |  |  | 77 |  |  |  | 29.69 | - | 41.85 |  |  |  | 34.84 |  |  |  |  |  |  |  |  |
Exercised |  |  | (196 | ) |  |  | 9.16 | - | 37.06 |  |  |  | 19.68 |  |  |  |  |  |  |  | 3,866 |
Forfeited |  |  | (9 | ) |  |  | 23.95 | - | 37.06 |  |  |  | 29.88 |  |  |  |  |  |  |  |  |
Outstanding at September 29, 2018 |  |  | 264 |  |  |  | 10.23 | - | 41.85 |  |  |  | 29.25 |  |  |  | 7.64 |  |  |  | 1,845 |
Vested and anticipated to vest in the future at September 29, 2018 |  |  | 262 |  |  |  |  |  |  |  |  |  | 29.22 |  |  |  | 7.69 |  |  |  | 1,974 |
Exercisable at September 29, 2018 |  |  | 109 |  |  |  |  |  |  |  |  |  | 24.73 |  |  |  | 5.98 |  |  |  | 1,228 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  |  |  |  |  | Weighted |
|  | Restricted |  |  | Average |
|  | Stock Units |  |  | Grant Date |
(Unit amounts in thousands) |  | Outstanding |  |  | Fair Value |
Balance, October 3, 2015 |  |  | 157 |  |  | $ | 18.96 |
Granted |  |  | 57 |  |  |  | 26.57 |
Forfeited |  |  | (2 | ) |  |  | 23.95 |
Released |  |  | (67 | ) |  |  | 17.95 |
Balance, October 1, 2016 |  |  | 145 |  |  |  | 22.35 |
Granted |  |  | 37 |  |  |  | 31.95 |
Released |  |  | (54 | ) |  |  | 20.43 |
Balance, September 30, 2017 |  |  | 128 |  |  |  | 25.92 |
Granted |  |  | 35 |  |  |  | 33.52 |
Forfeited |  |  | (3 | ) |  |  | 29.60 |
Released |  |  | (57 | ) |  |  | 22.26 |
Balance, September 29, 2018 |  |  | 103 |  |  |  | 30.40 |
Restricted Stock Units (RSUs) [Member] |
Notes Tables |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] |
|  | Year Ended |
|  | September 29, |  |  | September 30, |  |  | October 1, |
(In thousands) |  | 2018 |  |  | 2017 |  |  | 2016 |
Restricted stock unit grants: |  |  |  |  |  |  |  |  |
Units |  |  | 35 |  |  |  | 37 |  |  |  | 57 |
Market value |  | $ | 1,175 |  |  | $ | 1,180 |  |  | $ | 1,516 |
Compensation expense |  |  | 1,172 |  |  |  | 1,238 |  |  |  | 1,451 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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