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Pension and Other Postretirement Benefit Plans (Tables) | 12 Months Ended
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Sep. 28, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Schedule of Change In Plans' Combined Net Benefit Obligations | The following table sets forth the changes in the plans’ combined net benefit obligation (segregated between plans existing within and outside the U.S.) for the years ended September 28, 2018 and September 29, 2017 (in thousands):
| U.S. Plans |  | Non-U.S. Plans
| September 28, 2018 |  | September 29, 2017 |  | September 28, 2018 |  | September 29, 2017
Net benefit obligation at the beginning of the year | $ | 169,942 |  |  | $ | 185,664 |  |  | $ | 1,306,807 |  |  | $ | 1,363,782 |
Service cost | 4,765 |  |  | 1,000 |  |  | 8,269 |  |  | 7,509 |
Interest cost | 13,778 |  |  | 5,757 |  |  | 49,324 |  |  | 31,205 |
Participants’ contributions | 839 |  |  | — |  |  | 451 |  |  | 250 |
Actuarial (gains)/losses | (30,730 | ) |  | (9,922 | ) |  | (43,595 | ) |  | (142,273 | )
Benefits paid | (27,914 | ) |  | (14,338 | ) |  | (75,711 | ) |  | (40,208 | )
Curtailments/settlements/plan amendments | (9,434 | ) |  | — |  |  | (6,136 | ) |  | (1,375 | )
Acquisition of CH2M Plans | 327,156 |  |  | — |  |  | 924,233 |  |  | — |
Effect of exchange rate changes and other, net | — |  |  | 1,781 |  |  | (14,396 | ) |  | 87,917 |
Net benefit obligation at the end of the year | $ | 448,402 |  |  | $ | 169,942 |  |  | $ | 2,149,246 |  |  | $ | 1,306,807 |
Schedule of Change in Combined Fair Value of the Plans' Assets | The following table sets forth the changes in the combined Fair Value of the plans’ assets (segregated between plans existing within and outside the U.S.) for the years ended September 28, 2018 and September 29, 2017 (in thousands):
| U.S. Plans |  | Non-U.S. Plans
| September 28, 2018 |  | September 29, 2017 |  | September 28, 2018 |  | September 29, 2017
Fair value of plan assets at the beginning of the year | $ | 147,788 |  |  | $ | 142,464 |  |  | $ | 1,076,928 |  |  | $ | 1,003,911 |
Actual return on plan assets | 9,891 |  |  | 18,662 |  |  | (19,883 | ) |  | 16,789 |
Employer contributions | 58,097 |  |  | 1,000 |  |  | 31,556 |  |  | 21,005 |
Participants’ contributions | 839 |  |  | — |  |  | 451 |  |  | 250 |
Gross benefits paid | (27,914 | ) |  | (14,338 | ) |  | (75,711 | ) |  | (40,208 | )
Curtailments/settlements/plan amendments | (9,434 | ) |  | — |  |  | (5,496 | ) |  | (228 | )
Acquisition of CH2M Plans | 211,562 |  |  | — |  |  | 869,414 |  |  | — |
Effect of exchange rate changes and other, net | — |  |  | — |  |  | (9,778 | ) |  | 75,409 |
Fair value of plan assets at the end of the year | $ | 390,829 |  |  | $ | 147,788 |  |  | $ | 1,867,481 |  |  | $ | 1,076,928 |
Reconciliation of Combined Funded Status of Plans and Recognized in Consolidated Balance Sheet | The following table reconciles the combined funded statuses of the plans recognized in the accompanying Consolidated Balance Sheets at September 28, 2018 and September 29, 2017 (segregated between plans existing within and outside the U.S.) (in thousands):
| U.S. Plans |  | Non-U.S. Plans
| September 28, 2018 |  | September 29, 2017 |  | September 28, 2018 |  | September 29, 2017
Net benefit obligation at the end of the year | $ | 448,402 |  |  | $ | 169,942 |  |  | $ | 2,149,246 |  |  | $ | 1,306,807 |
Fair value of plan assets at the end of the year | 390,829 |  |  | 147,788 |  |  | 1,867,481 |  |  | 1,076,928 |
Under funded amount recognized at the end of the year | $ | 57,573 |  |  | $ | 22,154 |  |  | $ | 281,765 |  |  | $ | 229,879 |
Schedule of Accumulated and Projected Benefit Obligations | The following table presents the accumulated benefit obligation at September 28, 2018 and September 29, 2017 (segregated between plans existing within and outside the U.S.) (in thousands):
| U.S. Plans |  | Non-U.S. Plans
| September 28, 2018 |  | September 29, 2017 |  | September 28, 2018 |  | September 29, 2017
Accumulated benefit obligation at the end of the year | $ | 447,549 |  |  | $ | 169,942 |  |  | $ | 2,123,839 |  |  | $ | 1,291,600 |
Schedule of Amount Recognized in Accompanying Balance Sheets | The following table presents the amounts recognized in the accompanying Consolidated Balance Sheets at September 28, 2018 and September 29, 2017 (segregated between plans existing within and outside the U.S.) (in thousands):
| U.S. Plans |  | Non-U.S. Plans
| September 28, 2018 |  | September 29, 2017 |  | September 28, 2018 |  | September 29, 2017
Prepaid benefit cost included in noncurrent assets | $ | — |  |  | $ | — |  |  | $ | 19,736 |  |  | $ | 3,035 |
Accrued benefit cost included in current liabilities | 2,548 |  |  | — |  |  | 3,671 |  |  | 585 |
Accrued benefit cost included in noncurrent liabilities | 55,025 |  |  | 22,154 |  |  | 297,830 |  |  | 232,329 |
Net amount recognized at the end of the year | $ | 57,573 |  |  | $ | 22,154 |  |  | $ | 281,765 |  |  | $ | 229,879 |
Schedule of Pension Plans Recorded In Accumulated Other Comprehensive Loss Not Yet Recognized As Component of Net Periodic Pension Cost | The following table presents certain amounts relating to our plans recorded in accumulated other comprehensive loss that have not yet been recognized as components of net periodic benefit cost at September 28, 2018 and September 29, 2017 (segregated between U.S. and non-U.S. plans) (in thousands):
| U.S. Plans |  | Non-U.S. Plans
| September 28, 2018 |  | September 29, 2017 |  | September 28, 2018 |  | September 29, 2017
Net actuarial loss | $ | 37,255 |  |  | $ | 47,681 |  |  | $ | 273,312 |  |  | $ | 218,752 |
Prior service cost | — |  |  | — |  |  | (700 | ) |  | (855 | )
Total | $ | 37,255 |  |  | $ | 47,681 |  |  | $ | 272,612 |  |  | $ | 217,897 |
Schedule of Accumulated Comprehensive Income Amortized Against Earnings In Next Year | The following table presents the amount of accumulated comprehensive income that will be amortized against earnings as part of our net periodic benefit cost in fiscal 2019 based on 2018 exchange rates (segregated between U.S. and non-U.S. plans) (in thousands):
| U.S. Plans |  | Non-U.S. Plans
Unrecognized net actuarial loss | $ | 2,925 |  |  | $ | 8,616 |
Unrecognized prior service cost | — |  |  | (258 | )
Accumulated comprehensive loss to be recorded against earnings | $ | 2,925 |  |  | $ | 8,358 |
Schedule of Weighted Average Measurement Of Assets And Liabilities | The plans’ weighted average asset allocations at September 28, 2018 and September 29, 2017 (the measurement dates used in valuing the plans’ assets and liabilities) were as follows:
| U.S. Plans |  | Non-U.S. Pans
| September 28, 2018 |  | September 29, 2017 |  | September 28, 2018 |  | September 29, 2017
Equity securities | 27 | % |  | 70 | % |  | 24 | % |  | 24 | %
Debt securities | 39 | % |  | 23 | % |  | 49 | % |  | 32 | %
Real estate investments | — | % |  | — | % |  | 8 | % |  | 5 | %
Other | 34 | % |  | 7 | % |  | 19 | % |  | 39 | %
Anticipated Cash Contributions | The following table presents the amount of cash contributions we anticipate making into the plans during fiscal 2019 (in thousands):
| U.S. Plans |  | Non-U.S. Plans
Anticipated cash contributions | $ | 2,601 |  |  | $ | 31,549 |
Schedule of Expected Payments to Participants in Pension Plan | The following table presents the total benefit payments expected to be paid to plan participants during each of the next five fiscal years, and in total for the five years thereafter (in thousands):
| U.S. Plans |  | Non-U.S. Pans
2019 | $ | 31,785 |  |  | $ | 70,313 |
2020 | 31,270 |  |  | 71,337 |
2021 | 31,740 |  |  | 74,906 |
2022 | 31,818 |  |  | 78,097 |
2023 | 31,857 |  |  | 81,569 |
For the periods 2024 through 2028 | 154,755 |  |  | 448,246 |
Schedule of Contribution to Multiemployer Pension Plans | The following table presents the Company’s contributions to these multiemployer plans for the years ended September 28, 2018, September 29, 2017 and September 30, 2016 (in thousands):
| September 28, 2018 |  | September 29, 2017 |  | September 30, 2016
Canada | $ | 36,354 |  |  | $ | 35,182 |  |  | $ | 44,912 |
Europe | $ | 10,677 |  |  | $ | 6,212 |  |  | $ | 8,771 |
United States | $ | 9,536 |  |  | $ | 4,548 |  |  | $ | 5,058 |
Contributions to multiemployer pension plans | $ | 56,567 |  |  | $ | 45,942 |  |  | $ | 58,741 |
U.S. Plans |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Schedule of Significant Actuarial Assumptions In Determining Funded Status Plans | The following table presents the significant actuarial assumptions used in determining the funded statuses and the following year's benefit cost of the Company’s U.S. plans for the years ended September 28, 2018, September 29, 2017 and September 30, 2016:
| For the Years Ended
| September 28, 2018 |  | September 29, 2017 |  | September 30, 2016
Discount rates | 3.9% to 4.2% |  | 3.5 | % |  | 3.2 | %
Rates of compensation increases | 3.5% |  | — | % |  | — | %
Return on Assets | 5.8% to 5.9% |  | 7.5 | % |  | 7.4 | %
Schedule of Pension Plans Recognized In Accumulated Other Comprehensive Loss | The following table presents certain amounts relating to our U.S. plans recognized in accumulated other comprehensive (gain) loss at September 28, 2018, September 29, 2017 and September 30, 2016 (in thousands):
| September 28, 2018 |  | September 29, 2017 |  | September 30, 2016
Arising during the period: |  |  |  |  |  |  |  |
Net actuarial (gain) loss | $ | (7,514 | ) |  | $ | (11,372 | ) |  | $ | 4,337 |
Reclassification adjustments: |  |  |  |  |  |  |  |
Net actuarial losses | (2,913 | ) |  | (2,431 | ) |  | (2,312 | )
Total | $ | (10,427 | ) |  | $ | (13,803 | ) |  | $ | 2,025 |
Schedule of Fair Value of Pension Plan Assets | The following table presents the Fair Value of the Company’s Domestic U.S. plan assets at September 28, 2018, segregated by level of Fair Value measurement inputs within the Fair Value hierarchy promulgated by U.S. GAAP (in thousands):
| September 28, 2018
| Fair Value, Determined Using Fair Value Measurement Inputs
| Level 1 |  | Level 2 |  | Level 3 |  | Investments measured at Net Asset Value |  | Total
U.S. Domestic equities | $ | 13,861 |  |  | $ | 63,937 |  |  | $ | — |  |  | $ | — |  |  | $ | 77,798 |
Overseas equities | 26,699 |  |  | — |  |  | — |  |  | — |  |  | 26,699 |
U.S. Domestic bonds | 84,894 |  |  | 58,229 |  |  | — |  |  | — |  |  | 143,123 |
Overseas bonds | 938 |  |  | 9,570 |  |  | — |  |  | — |  |  | 10,508 |
Cash and equivalents | 6,631 |  |  | — |  |  | — |  |  | — |  |  | 6,631 |
Mutual funds | 126,042 |  |  | — |  |  | — |  |  | — |  |  | 126,042 |
Hedge funds | $ | — |  |  | $ | — |  |  | $ | — |  |  | 28 |  |  | 28 |
Total | $ | 259,065 |  |  | $ | 131,736 |  |  | $ | — |  |  | $ | 28 |  |  | $ | 390,829 |
The following table presents the Fair Value of the Company’s U.S. plan assets at September 29, 2017, segregated by level of Fair Value measurement inputs within the Fair Value hierarchy promulgated by U.S. GAAP (in thousands):
| September 29, 2017
| Fair Value, Determined Using Fair Value Measurement Inputs
| Level 1 |  | Level 3 |  | Total
U.S. Domestic equities | $ | 103,760 |  |  | $ | — |  |  | $ | 103,760 |
U.S. Domestic bonds | 33,404 |  |  | — |  |  | 33,404 |
Cash and equivalents | 4,448 |  |  | — |  |  | 4,448 |
Hedge funds | — |  |  | 6,176 |  |  | 6,176 |
Total | $ | 141,612 |  |  | $ | 6,176 |  |  | $ | 147,788 |
Summary of Changes in the Fair Value of Plans Level 3 Assets | The following table summarizes the changes in the Fair Value of the Company’s U.S. plans’ Level 3 assets for the year ended September 28, 2018 (in thousands):
| Hedge Funds
Balance at September 29, 2017 | $ | 6,176 |
Purchases, sales, and settlements | (6,176 | )
Realized and unrealized gains | — |
Balance at September 28, 2018 | $ | — |
The following table summarizes the changes in the Fair Value of the Company’s U.S. plans’ Level 3 assets for the year ended September 29, 2017 (in thousands):
| Real Estate |  | Hedge Funds
Balance at September 30, 2016 | $ | 3,477 |  |  | $ | 5,715 |
Purchases | (3,477 | ) |  | (557 | )
Realized and unrealized gains | — |  |  | 1,018 |
Balance at September 29, 2017 | $ | — |  |  | $ | 6,176 |
Schedule of Components of Net Periodic Pension Cost Recognized | The following table presents the components of net periodic benefit cost for the Company’s U.S. plans recognized in the accompanying Consolidated Statements of Earnings for the years ended September 28, 2018, September 29, 2017 and September 30, 2016 (in thousands):
| September 28, 2018 |  | September 29, 2017 |  | September 30, 2016
Service cost | $ | 4,765 |  |  | $ | 1,000 |  |  | $ | 9,875 |
Interest cost | 13,778 |  |  | 5,757 |  |  | 16,746 |
Expected return on plan assets | (19,663 | ) |  | (9,942 | ) |  | (22,368 | )
Actuarial loss | 3,845 |  |  | 3,985 |  |  | 7,512 |
Prior service cost | — |  |  | — |  |  | (176 | )
Net pension cost, before special items | 2,725 |  |  | 800 |  |  | 11,589 |
Contractual expense/Settlement loss | 4,146 |  |  | 1,781 |  |  | 8,061 |
Total net periodic pension cost recognized | $ | 6,871 |  |  | $ | 2,581 |  |  | $ | 19,650 |
Non-U.S. Plans |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Schedule of Significant Actuarial Assumptions In Determining Funded Status Plans | The following table presents the significant actuarial assumptions used in determining the funded statuses and the following year's benefit cost of the Company’s non-U.S. plans for the years ended September 28, 2018, September 29, 2017 and September 30, 2016:
| For the Years Ended
| September 28, 2018 |  | September 29, 2017 |  | September 30, 2016
Discount rates | 1.3% to 8.1% |  | 1.3% to 7.0% |  | 0.7% to 7.0%
Rates of compensation increases | 2.5% to 7.5% |  | 2.5% to 7.5% |  | 2.5% to 7.5%
Expected long-term rates of return on assets | 2.9% to 7.5% |  | 3.5% to 8.5% |  | 3.5% to 8.5%
Schedule of Pension Plans Recognized In Accumulated Other Comprehensive Loss | The following table presents certain amounts relating to our non-U.S. plans recognized in accumulated other comprehensive (gain) loss at September 28, 2018, September 29, 2017 and September 30, 2016 (in thousands):
| September 28, 2018 |  | September 29, 2017 |  | September 30, 2016
Arising during the period: |  |  |  |  |  |  |  |
Net actuarial (gain) loss | $ | 59,827 |  |  | $ | (76,860 | ) |  | $ | 102,925 |
Prior service cost (benefit) | 215 |  |  | 119 |  |  | 580 |
Total | 60,042 |  |  | (76,741 | ) |  | 103,505 |
Reclassification adjustments: |  |  |  |  |  |  |  |
Net actuarial losses | (5,507 | ) |  | (8,732 | ) |  | (7,508 | )
Prior service cost | 181 |  |  | 229 |  |  | 163 |
Total | (5,326 | ) |  | (8,503 | ) |  | (7,345 | )
Total | $ | 54,716 |  |  | $ | (85,244 | ) |  | $ | 96,160 |
Schedule of Fair Value of Pension Plan Assets | The following table presents the Fair Value of the Company’s non-U.S. plan assets at September 29, 2017, segregated by level of Fair Value measurement inputs within the Fair Value hierarchy promulgated by U.S. GAAP (in thousands):
| September 29, 2017
| Fair Value, Determined Using Fair Value Measurement Inputs
| Level 1 |  | Level 3 |  | Total
Domestic equities | $ | 30,916 |  |  | $ | — |  |  | $ | 30,916 |
Overseas equities | 229,205 |  |  | — |  |  | 229,205 |
Domestic bonds | 263,145 |  |  | — |  |  | 263,145 |
Overseas bonds | 77,682 |  |  | — |  |  | 77,682 |
Cash and equivalents | 38,924 |  |  | — |  |  | 38,924 |
Real estate | — |  |  | 58,974 |  |  | 58,974 |
Insurance contracts | — |  |  | 74,353 |  |  | 74,353 |
Other | — |  |  | 303,729 |  |  | 303,729 |
Total | $ | 639,872 |  |  | $ | 437,056 |  |  | $ | 1,076,928 |
The following table presents the Fair Value of the Company’s non-U.S. plan assets at September 28, 2018, segregated by level of Fair Value measurement inputs within the Fair Value hierarchy promulgated by U.S. GAAP (in thousands):
| September 28, 2018
| Fair Value, Determined Using Fair Value Measurement Inputs
| Level 1 |  | Level 2 |  | Level 3 |  | Investments measured at Net Asset Value |  | Total
Domestic equities | $ | — |  |  | 31,868 |  |  | $ | — |  |  | 36,642 |  |  | $ | 68,510 |
Overseas equities | — |  |  | 327,309 |  |  | — |  |  | 44,675 |  |  | 371,984 |
Domestic bonds | 252 |  |  | 222,282 |  |  | — |  |  | 1,080 |  |  | 223,614 |
Overseas bonds | — |  |  | 641,966 |  |  | — |  |  | 60,804 |  |  | 702,770 |
Cash and equivalents | 33,482 |  |  | 7,822 |  |  | — |  |  | — |  |  | 41,304 |
Real estate | — |  |  | 26,987 |  |  | 99,587 |  |  | 17,568 |  |  | 144,142 |
Insurance contracts | — |  |  | 4,188 |  |  | 95,782 |  |  | — |  |  | 99,970 |
Derivatives | — |  |  | (26,656 | ) |  | — |  |  | — |  |  | $ | (26,656 | )
Hedge funds | — |  |  | — |  |  | 135,786 |  |  | 8,047 |  |  | $ | 143,833 |
Mutual funds | 69 |  |  | 97,941 |  |  |  |  |  | — |  |  | 98,010 |
Total | $ | 33,803 |  |  | $ | 1,333,707 |  |  | $ | 331,155 |  |  | $ | 168,816 |  |  | $ | 1,867,481 |
Summary of Changes in the Fair Value of Plans Level 3 Assets | The following table summarizes the changes in the Fair Value of the Company’s non-U.S. Pension Plans’ Level 3 assets for the year ended September 28, 2018 (in thousands):
| Real Estate |  | Insurance Contracts |  | Hedge Funds
Balance at September 29, 2017 | $ | 58,974 |  |  | $ | 74,353 |  |  | $ | 303,729 |
Purchases, sales, and settlements | 42,711 |  |  | 21,626 |  |  | (154,446 | )
Realized and unrealized gains (losses) | (784 | ) |  | 1,551 |  |  | (6,650 | )
Transfers | — |  |  | — |  |  | — |
Effect of exchange rate changes | (1,314 | ) |  | (1,748 | ) |  | (6,847 | )
Balance at September 28, 2018 | $ | 99,587 |  |  | $ | 95,782 |  |  | $ | 135,786 |
The following table summarizes the changes in the Fair Value of the Company’s non-U.S. plans’ Level 3 assets for the year ended September 29, 2017 (in thousands):
| Real Estate |  | Insurance Contracts |  | Hedge Funds
Balance at September 30, 2016 | $ | 55,665 |  |  | $ | 39,473 |  |  | $ | 272,517 |
Purchases, sales, and settlements | (1,199 | ) |  | 422 |  |  | (9,022 | )
Realized and unrealized gains | 2,642 |  |  | (7,572 | ) |  | 19,662 |
Transfers | — |  |  | 40,031 |  |  | 11,758 |
Effect of exchange rate changes | 1,866 |  |  | 1,999 |  |  | 8,814 |
Balance at September 29, 2017 | $ | 58,974 |  |  | $ | 74,353 |  |  | $ | 303,729 |
Schedule of Components of Net Periodic Pension Cost Recognized | The following table presents the components of net periodic benefit cost for the Company’s Non-U.S. plans recognized in the accompanying Consolidated Statements of Earnings for the years ended September 28, 2018, September 29, 2017 and September 30, 2016 (in thousands):
| September 28, 2018 |  | September 29, 2017 |  | September 30, 2016
Service cost | $ | 8,269 |  |  | $ | 7,509 |  |  | $ | 14,378 |
Interest cost | 49,324 |  |  | 31,205 |  |  | 38,892 |
Expected return on plan assets | (83,328 | ) |  | (56,269 | ) |  | (50,190 | )
Actuarial loss | 6,655 |  |  | 10,616 |  |  | 9,092 |
Prior service cost | (257 | ) |  | (329 | ) |  | (260 | )
Net pension cost, before special items | (19,337 | ) |  | (7,268 | ) |  | 11,912 |
Curtailment expense/Settlement loss | 1,268 |  |  | (298 | ) |  | (7,512 | )
Total net periodic pension (income) cost recognized | $ | (18,069 | ) |  | $ | (7,566 | ) |  | $ | 4,400 |

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