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Shareholders' Equity (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 29, 2019 | Mar. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 29, 2019 | Jun. 30, 2018 | Sep. 29, 2018 | Sep. 30, 2017
Changes In Components Of OCI [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment and Other |  | $ 16,021 |  |  | $ (146,807) |  |  | $ 20,463 | $ (101,838) |  |
Document Period End Date |  |  |  |  |  |  |  | Jun. 29, 2019 |  |  |
Derivatives used in Net Investment Hedge, Net of Tax, Period Increase (Decrease) |  | (1,427) |  |  | 0 |  |  | $ 4,106 | 0 |  |
Other Comprehensive Income, Unrealized Gain on Derivatives Arising During Period, Net |  | (6,606) |  |  | 231 |  |  | (6,366) | 459 |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  | (85) |  |  | (613) |  |  | (404) | (895) |  |
Cumulative Effect on Retained Earnings, Net of Tax |  |  |  |  |  |  | $ 0 |  |  |  |
Net change in Accumulated other comprehensive income (loss) |  | 7,558 |  |  | (144,304) |  |  | 18,740 | (120,926) |  |
Other comprehensive income before reclassifications [Member] |  |  |  |  |  |  |  |  |  |  |
Changes In Components Of OCI [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment and Other | [1] | 15,560 |  |  | (146,203) |  |  | 20,836 | (99,803) |  |
Derivatives used in Net Investment Hedge, Net of Tax, Period Increase (Decrease) |  | 224 |  |  | 0 |  |  |  |  |  |
Other Comprehensive Income (Loss) Unrealized gain (loss) on investment securities, net |  |  |  |  |  |  |  | 6,816 | 0 |  |
Other Comprehensive Income, Unrealized Gain on Derivatives Arising During Period, Net |  |  |  | $ (6,849) | 0 |  |  |  |  | $ (6,849) | $ 0
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 and Other |  | 9,079 |  |  | 14,774 |  |  | 780 | 2,850 |  |
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Changes In Components Of OCI [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment and Other |  | (54) |  |  | 1,055 |  |  | (240) | (123) |  |
Derivatives used in Net Investment Hedge, Net of Tax, Period Increase (Decrease) |  | (1,651) |  |  | 0 |  |  |  |  |  |
Other Comprehensive Income (Loss) Unrealized gain (loss) on investment securities, net |  |  |  |  |  |  |  | (2,710) | 0 |  |
Other Comprehensive Income, Unrealized Gain on Derivatives Arising During Period, Net |  | 243 |  |  | 231 |  |  | 483 | 459 |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  | 85 |  |  | 613 |  |  | (404) | (895) |  |
Cumulative impact of newly adopted accounting standard updates [Member] |  |  |  |  |  |  |  |  |  |  |
Changes In Components Of OCI [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  | $ 0 | [2] |  | $ 0 | [2] |  | $ 0 | $ (22,354) |  |
[1] | Includes intra-entity foreign currency transactions that are of a long-term investment nature of $9,079 and $780 for the second quarter and first six months of 2019 and $14,774 and $2,850 for the second quarter and first six months 2018, respectively.
[2] | Amounts relate to unrealized gains and losses on investments and stranded tax effects reclassified from “Accumulated other comprehensive income” to “Retained earnings” in accordance with ASU No. 2018-02 and ASU No. 2016-01.

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