Fair Value Measurements (Carrying Amounts and Fair Value of Assets) (Details) - USD ($) $ in Thousands		Sep. 29, 2015	Dec. 30, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation plan		$ 400	$ 500
Equities | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	[1]	9,355	10,053
Equities | Level 1 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	[1]	5,829	6,678
Equities | Level 2 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	[1]	3,526	3,375
Equities | Level 3 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	[1]	0	0
Fixed income | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	[1]	5,025	5,355
Fixed income | Level 1 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	[1]	1,205	1,542
Fixed income | Level 2 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	[1]	3,820	3,813
Fixed income | Level 3 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	[1]	0	0
Money market fund | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	[2]	28,412	7,602
Money market fund | Level 1 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	[2]	0	0
Money market fund | Level 2 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	[2]	28,412	7,602
Money market fund | Level 3 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	[2]	$ 0	$ 0

[1] These investments relate to the Deferred Compensation Plan and the POWR Plan and are located in the other assets line item on the Consolidated Balance Sheets. The investments categorized as Level 2 in the fair value hierarchy are valued by using available market information which includes quoted market prices for identical or similar assets in non-active markets.

[2] At September 29, 2015 and December 30, 2014, $0.4 million and $0.5 million, respectively, of the balances in the money market fund related to the Deferred Compensation and POWR Plans and were located in the other assets line item on the Consolidated Balance Sheets. The remaining balances in the money market fund were short-term in nature and were classified in cash and cash equivalents on the Consolidated Balance Sheets. Money market funds are valued at amortized cost which reflects the market-based fair value.