Long-term debt (Details) (USD $) | Sep. 28, 2014 | Sep. 08, 2014 | Dec. 29, 2013 |
In Thousands, unless otherwise specified |
Debt Instrument [Line Items] | ' | ' | ' |
Long-term Debt, Gross | $4,141,440 | ' | $3,744,067 |
Debt Instrument, Unamortized Discount (Premium), Net | -28,833 | ' | -31,167 |
Long-term Debt | 4,112,607 | ' | 3,712,900 |
Summary Long-term debt | ' | ' | ' |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | 5,890 | ' | 5,890 |
Long-term Debt, Excluding Current Maturities | 4,106,717 | ' | 3,707,010 |
Unsecured Floating Rate Term Loan Due Quarterly Through August 2018 [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Face Amount | 131,100 | ' | 154,800 |
Unsecured Floating Rate Term Loan Due Quarterly Through December 2018 [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Face Amount | 35,343 | ' | 39,270 |
Unsecured notes bearing fixed rate interest at 8.75% due November 2014 [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Face Amount | 250,000 | ' | 250,000 |
Summary Long-term debt | ' | ' | ' |
Debt Instrument, Interest Rate, Stated Percentage | 8.75% | ' | ' |
Unsecured notes bearing fixed rate interest at 10% due June 2015 [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Face Amount | 66,568 | ' | 66,568 |
Summary Long-term debt | ' | ' | ' |
Debt Instrument, Interest Rate, Stated Percentage | 10.00% | ' | ' |
Unsecured notes bearing fixed rate interest at 6.375% due September 2015 [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Face Amount | 250,000 | ' | 250,000 |
Summary Long-term debt | ' | ' | ' |
Debt Instrument, Interest Rate, Stated Percentage | 6.38% | ' | ' |
Unsecured notes bearing fixed rate interest at 10% due April 2016 [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Face Amount | 193,429 | ' | 193,429 |
Summary Long-term debt | ' | ' | ' |
Debt Instrument, Interest Rate, Stated Percentage | 10.00% | ' | ' |
Unsecured Fixed Rate Notes 9.375 Percent Due November 2017 [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Face Amount | 0 | ' | 250,000 |
Summary Long-term debt | ' | ' | ' |
Debt Instrument, Interest Rate, Stated Percentage | 9.38% | ' | ' |
Unsecured notes bearing fixed rate interest at 7.125% due September 2018 [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Face Amount | 250,000 | ' | 250,000 |
Summary Long-term debt | ' | ' | ' |
Debt Instrument, Interest Rate, Stated Percentage | 7.13% | ' | ' |
Unsecured Fixed Rate Notes 5.125 Percent Due October 2019 [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Face Amount | 600,000 | ' | 600,000 |
Summary Long-term debt | ' | ' | ' |
Debt Instrument, Interest Rate, Stated Percentage | 5.13% | ' | ' |
Unsecured Fixed Rate Notes 5.125 Percent Due July 2020 [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Face Amount | 600,000 | ' | 600,000 |
Summary Long-term debt | ' | ' | ' |
Debt Instrument, Interest Rate, Stated Percentage | 5.13% | ' | ' |
Unsecured Fixed Rate Notes 4.875 Percent Due September 2021 [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Face Amount | 350,000 | 350,000 | 0 |
Summary Long-term debt | ' | ' | ' |
Debt Instrument, Interest Rate, Stated Percentage | 4.88% | 4.88% | ' |
Unsecured Fixed Rate Notes 6.375 Percent Due October 2023 [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Face Amount | 650,000 | ' | 650,000 |
Summary Long-term debt | ' | ' | ' |
Debt Instrument, Interest Rate, Stated Percentage | 6.38% | ' | ' |
Unsecured Fixed Rate Notes 5.500 Percent Due September 2024 [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Face Amount | 325,000 | 325,000 | 0 |
Summary Long-term debt | ' | ' | ' |
Debt Instrument, Interest Rate, Stated Percentage | 5.50% | 5.50% | ' |
Unsecured Fixed Rate Notes 7.75 Percent Due June 2027 [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Face Amount | 200,000 | ' | 200,000 |
Summary Long-term debt | ' | ' | ' |
Debt Instrument, Interest Rate, Stated Percentage | 7.75% | ' | ' |
Unsecured Fixed Rate Notes 7.25 Percent Due September 2027 [Member] | ' | ' | ' |
Debt Instrument [Line Items] | ' | ' | ' |
Debt Instrument, Face Amount | $240,000 | ' | $240,000 |
Summary Long-term debt | ' | ' | ' |
Debt Instrument, Interest Rate, Stated Percentage | 7.25% | ' | ' |