Equity (Earnings Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Numerator:
Income (loss) from continuing operations for purposes of calculating earnings per share									$ 128,424	$ 104,093	$ 101,547
Loss from discontinued operations, net of income taxes	(864)	52	(644)	(270)	(82)	(113)	(915)	(155)	(1,726)	(1,265)	(4,252)
Denominator:
Weighted average shares outstanding-Basic (in shares)									46,626,997	47,740,167	47,912,135
Effect of dilutive securities:
Stock options and contingently issued restricted stock (in shares)									47,557,705	48,489,322	48,406,320
Basic earnings (loss) per share from continuing operations attributable to common shareowners (in dollars per share)	$ 0.60	$ 0.70	$ 0.76	$ 0.69	$ 0.41	$ 0.65	$ 0.58	$ 0.54	$ 2.76	$ 2.18	$ 2.12
Basic earnings (loss) per share from discontinued operations attributable to common shareowners (in dollars per share)	$ (0.02)	$ 0.00	$ (0.01)	$ (0.01)	$ 0.00	$ 0.00	$ (0.02)	$ 0.00	$ (0.04)	$ (0.03)	$ (0.09)
Diluted earnings (loss) per share from continuing operations attributable to common shareowners (in dollars per share)	$ 0.59	$ 0.68	$ 0.75	$ 0.67	$ 0.40	$ 0.64	$ 0.58	$ 0.53	$ 2.70	$ 2.15	$ 2.10
Diluted earnings (loss) per share from discontinued operations attributable to common shareowners (in dollars per share)	$ (0.02)	$ 0.00	$ (0.01)	$ (0.01)	$ 0.00	$ 0.00	$ (0.02)	$ 0.00	$ (0.04)	$ (0.03)	$ (0.09)
Net Income (Loss) Available to Common Stockholders, Basic	27,166	32,036	35,264	32,232	19,099	30,867	27,284	25,578
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest and Redeemable Noncontrolling Interest									128,198	104,151	97,866
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 675,927				$ 644,077				$ 675,927	$ 644,077	$ 603,200	$ 527,363
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities									931,000	749,000	494,185
Stock options
Antidilutive securities excluded from computation of earnings per share amount
Antidilutive securities excluded from computation of earnings per share amount (in shares)									645,000	2,289,000	4,591,000
Effect of dilutive securities:
Weighted average shares outstanding-Diluted (in shares)									1,188,000	1,097,000	935,000