Taxes (Detail) - USD ($)	3 Months Ended					9 Months Ended
	Oct. 04, 2015	Jul. 05, 2015	Apr. 05, 2015	Sep. 28, 2014	Jun. 29, 2014	Oct. 04, 2015	Sep. 28, 2014	Dec. 31, 2014
Decrease resulting from Prior period tax positions	$ 993,000	$ 112,000	$ 364,000	$ 652,000
Decrease in tax expense from expiration of statues of limitations	611,000			217,000
Increase resulting from current period tax positions	65,000
Decrease resulting from settlements with taxing authorities					$ 418,000
Decrease in income tax reserves						$ 635,000
APIC portion of increase in income tax reserves						157,000
Tax expense portion of decrease in income tax reserves						478,000
Interest and penalties included in reserve						5,000
Liability for uncertain tax positions	4,961,000					4,961,000
Reserve for income taxes classified as a noncurrent iability	3,933,000					3,933,000		$ 4,623,000
Reserve for income taxes classified an noncurrent deferred tax assets	1,028,000					1,028,000
Interest and penalties, gross	507,000					507,000
Reserve for income taxes to be recorded in additional paid in capital						507,000
Minimum decrease in income tax expense due to release in reserves						750,000
Maximum decrease in income tax expense due to release in reserves						$ 850,000
Tax years open to examination by Internal Revenue Service						2012 through 2014
Tax years open to examination by various taxing authorities						2011 through 2014
Tax years open to examination by various taxing authorities for other entities						2010 through 2014
SISD | Discontinued Operations, Disposed of by Sale
Gain on Disposal of Discontinued Operation, pretax	125,465,000			0		$ 125,465,000	$ 0
Tax Expense on gain of Discontinued Operation	$ 47,175,000			$ 1,292,000		$ 47,801,000	$ 3,045,000