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Note 11 Earnings Per Share (Tables) | 6 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
| Three Months Ended |  | Six Months Ended
| March 31, 2018 |  | April 1, 2017 |  | March 31, 2018 |  | April 1, 2017
| (In thousands, except per share data)
Numerator: |  |  |  |  |  |  |
Net income (loss) | $ | 24,632 |  |  | $ | 31,717 |  |  | $ | (130,278 | ) |  | $ | 76,581 |
Denominator: |  |  |  |  |  |  |
Weighted average common shares outstanding | 70,441 |  |  | 74,761 |  |  | 71,096 |  |  | 74,156 |
Effect of dilutive stock options and restricted stock units | 3,141 |  |  | 3,103 |  |  | — |  |  | 3,375 |
Denominator for diluted earnings per share | 73,582 |  |  | 77,864 |  |  | 71,096 |  |  | 77,531 |
Net income (loss) per share: |  |  |  |  |  |  |
Basic | $ | 0.35 |  |  | $ | 0.42 |  |  | $ | (1.83 | ) |  | $ | 1.03 |
Diluted | $ | 0.33 |  |  | $ | 0.41 |  |  | $ | (1.83 | ) |  | $ | 0.99 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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