Summary of the Basis Used to Measure Pension Plans' Assets at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Jan. 01, 2011	Jan. 02, 2010
Elgin Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 3,188		$ 3,342	$ 3,189
Elgin Plan | Short Term Investment Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	169	[1]
Elgin Plan | Equity Securities | Large Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	768
Elgin Plan | Equity Securities | Mid Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	86
Elgin Plan | Equity Securities | Small Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	121
Elgin Plan | Equity Securities | International
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	607
Elgin Plan | Fixed Income | Govt/Corp
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	989
Elgin Plan | Fixed Income | High Yield
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	183
Elgin Plan | Alternative | Global Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	88
Elgin Plan | Alternative | Commodities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	177
Elgin Plan | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	3,019
Elgin Plan | Fair Value, Inputs, Level 1 | Equity Securities | Large Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	768
Elgin Plan | Fair Value, Inputs, Level 1 | Equity Securities | Mid Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	86
Elgin Plan | Fair Value, Inputs, Level 1 | Equity Securities | Small Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	121
Elgin Plan | Fair Value, Inputs, Level 1 | Equity Securities | International
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	607
Elgin Plan | Fair Value, Inputs, Level 1 | Fixed Income | Govt/Corp
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	989
Elgin Plan | Fair Value, Inputs, Level 1 | Fixed Income | High Yield
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	183
Elgin Plan | Fair Value, Inputs, Level 1 | Alternative | Global Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	88
Elgin Plan | Fair Value, Inputs, Level 1 | Alternative | Commodities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	177
Elgin Plan | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	169
Elgin Plan | Fair Value, Inputs, Level 2 | Short Term Investment Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	169	[1]
Smithville Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	7,820		8,253	7,526
Smithville Plan | Short Term Investment Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	328	[1]
Smithville Plan | Equity Securities | Large Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1,895
Smithville Plan | Equity Securities | Mid Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	209
Smithville Plan | Equity Securities | Small Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	328
Smithville Plan | Equity Securities | International
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1,535
Smithville Plan | Fixed Income | Govt/Corp
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	2,435
Smithville Plan | Fixed Income | High Yield
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	449
Smithville Plan | Alternative | Global Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	225
Smithville Plan | Alternative | Commodities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	416
Smithville Plan | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	7,492
Smithville Plan | Fair Value, Inputs, Level 1 | Equity Securities | Large Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1,895
Smithville Plan | Fair Value, Inputs, Level 1 | Equity Securities | Mid Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	209
Smithville Plan | Fair Value, Inputs, Level 1 | Equity Securities | Small Cap
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	328
Smithville Plan | Fair Value, Inputs, Level 1 | Equity Securities | International
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1,535
Smithville Plan | Fair Value, Inputs, Level 1 | Fixed Income | Govt/Corp
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	2,435
Smithville Plan | Fair Value, Inputs, Level 1 | Fixed Income | High Yield
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	449
Smithville Plan | Fair Value, Inputs, Level 1 | Alternative | Global Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	225
Smithville Plan | Fair Value, Inputs, Level 1 | Alternative | Commodities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	416
Smithville Plan | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	328
Smithville Plan | Fair Value, Inputs, Level 2 | Short Term Investment Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	328	[1]
Wrexham Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	11,518
Wrexham Plan | Short Term Investment Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	800	[1]
Wrexham Plan | Equity Securities | International Developed Markets
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	2,008
Wrexham Plan | Equity Securities | International Emerging Markets
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	341
Wrexham Plan | Equity Securities | International Global Markets
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1,604
Wrexham Plan | Equity Securities | United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	3,599
Wrexham Plan | Fixed Income | Govt/Corp
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1,802
Wrexham Plan | Fixed Income | Aggregate Fair Value Under Fair Value Option
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	354
Wrexham Plan | Fixed Income | Index Linked
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1,010
Wrexham Plan | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	10,718
Wrexham Plan | Fair Value, Inputs, Level 1 | Equity Securities | International Developed Markets
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	2,008
Wrexham Plan | Fair Value, Inputs, Level 1 | Equity Securities | International Emerging Markets
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	341
Wrexham Plan | Fair Value, Inputs, Level 1 | Equity Securities | International Global Markets
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1,604
Wrexham Plan | Fair Value, Inputs, Level 1 | Equity Securities | United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	3,599
Wrexham Plan | Fair Value, Inputs, Level 1 | Fixed Income | Govt/Corp
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1,802
Wrexham Plan | Fair Value, Inputs, Level 1 | Fixed Income | Aggregate Fair Value Under Fair Value Option
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	354
Wrexham Plan | Fair Value, Inputs, Level 1 | Fixed Income | Index Linked
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	1,010
Wrexham Plan | Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	800
Wrexham Plan | Fair Value, Inputs, Level 2 | Short Term Investment Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 800	[1]

[1] Represents collective short term investment fund, composed of high-grade money market instruments with short maturities.