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Long-term debt (Details) (USD $)
In Thousands, unless otherwise specified |
Sep. 29, 2013
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Dec. 30, 2012
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| Summary Long-term debt | ||||||
| Long-term Debt | $ 1,980,190 | $ 1,432,100 | ||||
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Unsecured Floating Rate Term Loan Due December 2013 Through August 2018 [Member]
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| Summary Long-term debt | ||||||
| Long-term Debt | 154,800 | 0 | ||||
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Borrowings under revolving credit agreements expiring August 2018[Member]
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| Summary Long-term debt | ||||||
| Long-term Debt | 0 | 205,000 | ||||
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Unsecured notes bearing fixed rate interest at 8.75% due November 2014 [Member]
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| Summary Long-term debt | ||||||
| Long-term Debt | 248,990 | 248,376 | ||||
| Long-term debt, interest rate, stated percentage | 8.75% | |||||
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Unsecured notes bearing fixed rate interest at 10% due June 2015 [Member]
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| Summary Long-term debt | ||||||
| Long-term Debt | 62,723 | 61,286 | ||||
| Long-term debt, interest rate, stated percentage | 10.00% | |||||
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Unsecured notes bearing fixed rate interest at 6.375% due September 2015 [Member]
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| Summary Long-term debt | ||||||
| Long-term Debt | 248,889 | 248,497 | ||||
| Long-term debt, interest rate, stated percentage | 6.375% | |||||
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Unsecured notes bearing fixed rate interest at 10% due April 2016 [Member]
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| Summary Long-term debt | ||||||
| Long-term Debt | 177,905 | 174,241 | ||||
| Long-term debt, interest rate, stated percentage | 10.00% | |||||
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Unsecured notes bearing fixed rate interest at 9.375% due November 2017 [Member]
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| Summary Long-term debt | ||||||
| Long-term Debt | 247,852 | [1] | 247,547 | [1] | ||
| Long-term debt, interest rate, stated percentage | 9.375% | |||||
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Unsecured notes bearing fixed rate interest at 7.125% due September 2018 [Member]
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| Summary Long-term debt | ||||||
| Long-term Debt | 247,461 | 247,153 | ||||
| Long-term debt, interest rate, stated percentage | 7.125% | |||||
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Unsecured notes bearing fixed rate interest at 5.125% due July 2020 [Member]
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| Summary Long-term debt | ||||||
| Long-term Debt | $ 591,570 | $ 0 | ||||
| Long-term debt, interest rate, stated percentage | 5.125% | |||||
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If redeemed during the 12-month period commencing on November 15 , 2013 | Unsecured notes bearing fixed rate interest at 9.375% due November 2017 [Member]
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| Debt Instrument [Line Items] | ||||||
| Debt Instrument Redemption Price | 104.688% | |||||
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