Fair Value Measurements (Carrying Amounts and Fair Value of Assets) (Details) (USD $)	Mar. 31, 2015		Dec. 30, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation plan	$ 400,000		$ 500,000
Equities | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	10,227,000	[1]	10,053,000	[1]
Equities | Level 1 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	6,764,000	[1]	6,678,000	[1]
Equities | Level 2 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	3,463,000	[1]	3,375,000	[1]
Equities | Level 3 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	0	[1]	0	[1]
Fixed income | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	5,374,000	[1]	5,355,000	[1]
Fixed income | Level 1 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	1,499,000	[1]	1,542,000	[1]
Fixed income | Level 2 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	3,875,000	[1]	3,813,000	[1]
Fixed income | Level 3 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	0	[1]	0	[1]
Money market fund | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	19,885,000	[2]	7,602,000	[2]
Money market fund | Level 1 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	0	[2]	0	[2]
Money market fund | Level 2 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	19,885,000	[2]	7,602,000	[2]
Money market fund | Level 3 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	$ 0	[2]	$ 0	[2]

[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 March 31, 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.