Fair Value Measurements (Schedule Of Carrying Amount And Fair Value Of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2014	Dec. 28, 2013
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments, Fair Value	$ 599,700	$ 597,146
Carrying Amount [Member] | Senior Secured First Lien Notes Payable Due 2019 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments, Fair Value	330,348	331,059
Carrying Amount [Member] | Senior Secured Second Lien Notes Payable Due 2020 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments, Fair Value	246,409	246,300
Carrying Amount [Member] | Revolving Credit Facility [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments, Fair Value	11,100	7,600
Carrying Amount [Member] | State Of Ohio Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments, Fair Value	5,543	5,887
Carrying Amount [Member] | Columbia County, Wisconsin Municipal Debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments, Fair Value	300	300
Carrying Amount [Member] | Industrial Development Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments, Fair Value	6,000	6,000
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments, Fair Value	607,208	602,291
Fair Value [Member] | Senior Secured First Lien Notes Payable Due 2019 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments, Fair Value	332,928	332,509
Fair Value [Member] | Senior Secured Second Lien Notes Payable Due 2020 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments, Fair Value	251,337	249,995
Fair Value [Member] | Revolving Credit Facility [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments, Fair Value	11,100	7,600
Fair Value [Member] | State Of Ohio Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments, Fair Value	5,543	5,887
Fair Value [Member] | Columbia County, Wisconsin Municipal Debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments, Fair Value	300	300
Fair Value [Member] | Industrial Development Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instruments, Fair Value	$ 6,000	$ 6,000