Segment Information (by Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 26, 2014	Sep. 26, 2014	Jun. 27, 2014	Mar. 28, 2014	Dec. 27, 2013	Sep. 27, 2013	Jun. 28, 2013	Mar. 29, 2013	Dec. 26, 2014	Dec. 27, 2013	Dec. 28, 2012
Segment Reporting Information [Line Items]
Net Sales	$ 306,005	$ 302,614	$ 322,549	$ 289,962	$ 271,923	$ 277,035	$ 286,020	$ 269,046	$ 1,221,130	$ 1,104,024	$ 1,012,456
Operating earnings									308,925	279,769	224,677
Segment Assets Reconciliation	1,544,778				1,327,228				1,544,778	1,327,228
Industrial
Segment Reporting Information [Line Items]
Net Sales									727,389	652,344	603,398
Operating earnings									225,337	211,265	186,129
Segment Assets Reconciliation	770,623				591,135				770,623	591,135
Contractor
Segment Reporting Information [Line Items]
Net Sales									375,574	342,546	298,811
Operating earnings									81,892	72,245	54,310
Segment Assets Reconciliation	176,757				152,300				176,757	152,300
Lubrication
Segment Reporting Information [Line Items]
Net Sales									118,167	109,134	110,247
Operating earnings									26,403	22,512	22,535
Segment Assets Reconciliation	83,148				82,503				83,148	82,503
Unallocated Corporate
Segment Reporting Information [Line Items]
Operating earnings									(24,707)	(26,253)	(38,297)
Segment Assets Reconciliation	$ 514,250				$ 501,290				$ 514,250	$ 501,290