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Employee Benefit Plans | 6 Months Ended
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Mar. 31, 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 |  | Six Months Ended
|  | March 31, 2018 |  | April 1, 2017 |  | March 31, 2018 |  | April 1, 2017
U.S. Plans |  |  |  |  |  |  |  |
Service cost |  | $ | 5,633 |  |  | $ | 6,021 |  |  | $ | 11,267 |  |  | $ | 12,043 |
Interest cost |  | 8,073 |  |  | 7,635 |  |  | 16,146 |  |  | 15,271 |
Expected return on plan assets |  | (13,575 | ) |  | (13,627 | ) |  | (27,151 | ) |  | (27,255 | )
Amortization of prior service cost (credit) |  | 47 |  |  | 47 |  |  | 94 |  |  | 94 |
Amortization of actuarial loss |  | 6,902 |  |  | 8,419 |  |  | 13,804 |  |  | 16,838 |
Pension expense for U.S. defined benefit plans |  | $ | 7,080 |  |  | $ | 8,495 |  |  | $ | 14,160 |  |  | $ | 16,991 |
Non-U.S. Plans |  |  |  |  |  |  |  |
Service cost |  | $ | 1,519 |  |  | $ | 1,514 |  |  | $ | 2,989 |  |  | $ | 3,046 |
Interest cost |  | 1,092 |  |  | 746 |  |  | 2,147 |  |  | 1,497 |
Expected return on plan assets |  | (1,290 | ) |  | (1,122 | ) |  | (2,533 | ) |  | (2,253 | )
Amortization of prior service cost (credit) |  | (15 | ) |  | (27 | ) |  | (29 | ) |  | (54 | )
Amortization of actuarial loss |  | 648 |  |  | 1,109 |  |  | 1,272 |  |  | 2,229 |
Pension expense for non-U.S. defined benefit plans |  | $ | 1,954 |  |  | $ | 2,220 |  |  | $ | 3,846 |  |  | $ | 4,465 |
Pension expense for our defined contribution plans consists of:
|  | Three Months Ended |  | Six Months Ended
|  | March 31, 2018 |  | April 1, 2017 |  | March 31, 2018 |  | April 1, 2017
U.S. defined contribution plans |  | $ | 4,136 |  |  | $ | 3,586 |  |  | $ | 8,108 |  |  | $ | 7,256 |
Non-U.S. defined contribution plans |  | 1,550 |  |  | 1,472 |  |  | 3,259 |  |  | 2,832 |
Total pension expense for defined contribution plans |  | $ | 5,686 |  |  | $ | 5,058 |  |  | $ | 11,367 |  |  | $ | 10,088 |
In 2018, expected contributions for all of our U.S. defined benefit pension plans to be approximately $149,000.

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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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