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Shareholders' Equity (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Apr. 02, 2016 | Mar. 28, 2015 | Apr. 02, 2016 | Sep. 26, 2015
Changes In Components Of OCI [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment |  | $ 73,179 | $ (198,387) |  |
Other Comprehensive Income (Loss) Unrealized gain (loss) on investment securities, net |  | (1,651) | 124 |  |
Other Comprehensive Income (Loss), Unrealized Gain on Derivatives Arising During Period, Net |  | 91 | 923 |  |
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax |  | (920) | (842) |  |
Net change in accumulated other comprehensive income (loss) |  | $ 70,531 | (196,498) |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  | $ 400,000
Treasury Stock, Shares, Acquired |  | 43,350 |  | 1,476,224 |
Treasury Stock, Value, Acquired, Cost Method |  | $ 2,501 |  | $ 82,718 |
Other comprehensive income before reclassifications [Member] |  |  |  |  |
Changes In Components Of OCI [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment | [1] | 69,969 | (199,228) |  |
Other Comprehensive Income (Loss) Unrealized gain (loss) on investment securities, net |  | (1,651) | 124 |  |
Other Comprehensive Income (Loss), Unrealized Gain on Derivatives Arising During Period, Net |  | 0 | 896 |  |
Other Comprehensive Income (loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (loss) Recognized in Net Periodic Benefit Cost, After Tax |  | 41 | 34 |  |
Other comprehensive income before reclassifications [Member] | Intra-entity foreign currency transactions [Member] |  |  |  |  |
Changes In Components Of OCI [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment |  | (32,801) | 45,263 |  |
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |
Changes In Components Of OCI [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment |  | 1,202 | 841 |  |
Other Comprehensive Income (Loss) Unrealized gain (loss) on investment securities, net |  | 0 | 0 |  |
Other Comprehensive Income (Loss), Unrealized Gain on Derivatives Arising During Period, Net |  | 91 | 27 |  |
Other Comprehensive Income (loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (loss) Recognized in Net Periodic Benefit Cost, After Tax |  | $ 879 | $ 808 |  |
[1] | Includes intra-entity foreign currency transactions that are of a long-term investment nature of $(32,801) and $45,263 for the first quarters of 2016 and 2015, respectively.

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