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Employee Benefit Plans | 9 Months Ended
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Jun. 30, 2018
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract] |
Employee Benefit Plans | Employee Benefit Plans Net periodic benefit costs for our defined benefit pension plans are as follows:
|  | Three Months Ended |  | Nine Months Ended
|  | June 30, 2018 |  | July 1, 2017 |  | June 30, 2018 |  | July 1, 2017
U.S. Plans |  |  |  |  |  |  |  |
Service cost |  | $ | 5,634 |  |  | $ | 6,044 |  |  | $ | 16,901 |  |  | $ | 18,087 |
Interest cost |  | 8,073 |  |  | 7,659 |  |  | 24,219 |  |  | 22,930 |
Expected return on plan assets |  | (13,575 | ) |  | (13,627 | ) |  | (40,726 | ) |  | (40,882 | )
Amortization of prior service cost (credit) |  | 46 |  |  | 46 |  |  | 140 |  |  | 140 |
Amortization of actuarial loss |  | 6,903 |  |  | 8,465 |  |  | 20,707 |  |  | 25,303 |
Pension expense for U.S. defined benefit plans |  | $ | 7,081 |  |  | $ | 8,587 |  |  | $ | 21,241 |  |  | $ | 25,578 |
Non-U.S. Plans |  |  |  |  |  |  |  |
Service cost |  | $ | 1,486 |  |  | $ | 1,499 |  |  | $ | 4,475 |  |  | $ | 4,545 |
Interest cost |  | 1,066 |  |  | 794 |  |  | 3,213 |  |  | 2,291 |
Expected return on plan assets |  | (1,260 | ) |  | (1,180 | ) |  | (3,793 | ) |  | (3,433 | )
Amortization of prior service cost (credit) |  | (15 | ) |  | (26 | ) |  | (44 | ) |  | (80 | )
Amortization of actuarial loss |  | 630 |  |  | 1,145 |  |  | 1,902 |  |  | 3,374 |
Curtailment gain |  | — |  |  | (150 | ) |  | — |  |  | (150 | )
Pension expense for non-U.S. defined benefit plans |  | $ | 1,907 |  |  | $ | 2,082 |  |  | $ | 5,753 |  |  | $ | 6,547 |
Pension expense for our defined contribution plans consists of:
|  | Three Months Ended |  | Nine Months Ended
|  | June 30, 2018 |  | July 1, 2017 |  | June 30, 2018 |  | July 1, 2017
U.S. defined contribution plans |  | $ | 4,374 |  |  | $ | 3,926 |  |  | $ | 12,482 |  |  | $ | 11,182 |
Non-U.S. defined contribution plans |  | 1,460 |  |  | 1,534 |  |  | 4,719 |  |  | 4,366 |
Total pension expense for defined contribution plans |  | $ | 5,834 |  |  | $ | 5,460 |  |  | $ | 17,201 |  |  | $ | 15,548 |
Contributions for all of our U.S. defined benefit pension plans are expected to be approximately $149,000 in 2018.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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