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Defined Pension Benefit Obligations | 6 Months Ended
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Mar. 30, 2018
Defined Benefit Plan [Abstract] |
Defined Pension Benefit Obligations | Defined Pension Benefit Obligations In connection with the acquisition of CH2M on December 15, 2017, the Company preliminarily recorded estimates of CH2M’s pension plan assets and liabilities which are reflected in the amounts of $1.1 billion and ($1.2 billion), respectively. CH2M sponsors several defined benefit pension plans primarily in the U.S. and the U.K. In the U.S., CH2M has three noncontributory defined benefit pension plans. Plan benefits are generally based on years of service and compensation during the span of employment. The following table presents the components of net periodic benefit cost recognized in earnings during the three and six months ended March 30, 2018 and March 31, 2017 (in thousands):
| Three Months Ended |  | Six Months Ended
| March 30, 2018 |  | March 31, 2017 |  | March 30, 2018 |  | March 31, 2017
Component: |  |  |  |  |  |  |
Service cost | $ | 1,902 |  |  | $ | 2,184 |  |  | $ | 4,965 |  |  | $ | 4,400 |
Interest cost | 11,500 |  |  | 8,699 |  |  | 27,571 |  |  | 17,427 |
Expected return on plan assets | (19,014 | ) |  | (15,527 | ) |  | (45,018 | ) |  | (31,115 | )
Amortization of previously unrecognized items | 2,594 |  |  | 3,530 |  |  | 5,047 |  |  | 7,086 |
Settlement loss (gain) | — |  |  | 41 |  |  | 3,819 |  |  | 84 |
Net periodic benefit | $ | (3,018 | ) |  | $ | (1,073 | ) |  | $ | (3,616 | ) |  | $ | (2,118 | )
In December 2017, the Company incurred a settlement loss of approximately $3.8 million related to its Sverdrup pension plan in the U.S. The following table presents certain information regarding the Company’s cash contributions to our pension plans for fiscal 2018 (in thousands):
Cash contributions made during the first six months of fiscal 2018 | $ | 11,319 |
Cash contributions we expect to make during the remainder of fiscal 2018 | 18,741 |
Total | $ | 30,060 |

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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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