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Benefit Plans (Tables) | 9 Months Ended
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Sep. 29, 2012
Components of Net Periodic Benefit Cost | Components of net periodic benefit cost were as follows:
|  | Three months ended |
|  | Pension benefits |  |  | Post-retirement |
In thousands |  | September 29, 2012 |  |  | October 1, 2011 |  |  | September 29, 2012 |  |  | October 1, 2011 |
Service cost |  | $ | 3,761 |  |  | $ | 3,131 |  |  | $ | 55 |  |  | $ | 45 |
Interest cost |  |  | 8,087 |  |  |  | 8,225 |  |  |  | 422 |  |  |  | 472 |
Expected return on plan assets |  |  | (7,844 | ) |  |  | (7,963 | ) |  |  | — |  |  |  | — |
Amortization of prior year service benefit |  |  | — |  |  |  | — |  |  |  | (6 | ) |  |  | (7) |
Recognized net actuarial loss (gains) |  |  | 2,577 |  |  |  | 971 |  |  |  | (602 | ) |  |  | (826) |
Net periodic benefit cost (income) |  | $ | 6,581 |  |  | $ | 4,364 |  |  | $ | (131 | ) |  | $ | (316) |
|  | Nine months ended |
|  | Pension benefits |  |  | Post-retirement |
In thousands |  | September 29, 2012 |  |  | October 1, 2011 |  |  | September 29, 2012 |  |  | October 1, 2011 |
Service cost |  | $ | 11,283 |  |  | $ | 9,392 |  |  | $ | 165 |  |  | $ | 135 |
Interest cost |  |  | 24,261 |  |  |  | 24,675 |  |  |  | 1,266 |  |  |  | 1,416 |
Expected return on plan assets |  |  | (23,532 | ) |  |  | (23,890 | ) |  |  | — |  |  |  | — |
Amortization of prior year service benefit |  |  | — |  |  |  | — |  |  |  | (18 | ) |  |  | (21) |
Recognized net actuarial loss (gains) |  |  | 7,731 |  |  |  | 2,914 |  |  |  | (1,806 | ) |  |  | (2,479) |
Net periodic benefit cost (income) |  | $ | 19,743 |  |  | $ | 13,091 |  |  | $ | (393 | ) |  | $ | (949) |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration