Note 18 - Selected Quarterly Financial Data (Unaudited) (Details) (USD $)	12 Months Ended			3 Months Ended					12 Months Ended	3 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Dec. 28, 2013 Shocking [Member]	Mar. 30, 2013 Shocking [Member]	Dec. 29, 2012 Shocking [Member]	Dec. 29, 2012 Shocking [Member]	Sep. 29, 2012 Dunsen [Member]	Dec. 31, 2011 Dunsen [Member]	Dec. 28, 2013 Hamlin, Inc. [Member]	Sep. 28, 2013 Hamlin, Inc. [Member]	Sep. 30, 2013 Hamlin, Inc. [Member]	Jun. 29, 2013 Hamlin, Inc. [Member]	Sep. 29, 2012 Accel and Terra Power [Member]	Sep. 29, 2012 Accel AB [Member]	Sep. 29, 2012 Selco A/S [Member]	Mar. 31, 2012 Selco A/S [Member]	Dec. 31, 2011 Selco A/S [Member]
Note 18 - Selected Quarterly Financial Data (Unaudited) (Details) [Line Items]
Income Tax Expense (Benefit)	$ 35,451,000	$ 24,720,000	$ 28,077,000	$ 2,800,000	$ 3,300,000
Non-Cash Credit Related To Inventory Stepup										500,000
Business Combination, Acquisition Related Costs	1,700,000	900,000	1,000,000							200,000		300,000	1,200,000	600,000
Non-cash Charges Related to Inventory Step-up											400,000	300,000	1,700,000		400,000	400,000	200,000	500,000
Other than Temporary Impairment Losses, Investments					10,700,000	3,300,000
Asset Impairment Charges	0	500,000	2,300,000				7,300,000	500,000	900,000
Defined Benefit Plan, Purchases, Sales, and Settlements	$ 5,100,000						$ 5,100,000