Capital Stock (Details) $ / shares in Units, $ in Thousands									3 Months Ended				9 Months Ended		12 Months Ended
	Nov. 04, 2015 $ / shares	Aug. 24, 2015 USD ($) $ / shares	Jul. 30, 2015 $ / shares	Jun. 15, 2015 USD ($) $ / shares	May. 20, 2015 $ / shares	Apr. 28, 2015 $ / shares shares	Apr. 09, 2015 USD ($) $ / shares	Mar. 05, 2015 $ / shares	Sep. 30, 2015 USD ($) $ / shares shares	Jun. 30, 2015 USD ($) $ / shares shares	Mar. 29, 2015 USD ($) $ / shares shares	Sep. 28, 2014 shares	Sep. 30, 2015 USD ($) $ / shares shares	Sep. 28, 2014 shares	Dec. 28, 2014 USD ($) $ / shares shares	Oct. 13, 2014 USD ($)	Dec. 31, 2012 USD ($) $ / shares shares
Class of Stock [Line Items]
Treasury Stock, Shares									5,825,623				5,825,623		975,594
Preferred stock authorized shares									40,000,000				40,000,000		40,000,000
Preferred stock par value | $ / shares									$ 0.001				$ 0.001		$ 0.001
Demand holder rights percentage																	5.00%
Proceeds received greater than | $																	$ 100,000
Percent market capitalization greater than																	2.50%
Stock Repurchase Program, Authorized Amount | $																$ 400,000
Treasury Stock, Shares, Acquired									1,546,481	371,738	2,806,244				1,101,160
Treasury Stock, Value, Acquired, Cost Method | $									$ 80,000	$ 20,000	$ 165,000		$ 265,209		$ 68,000
Share Price | $ / shares									$ 51.74	$ 53.87	$ 58.86				$ 61.58
Treasury Stock, Shares, Acquired and Not Yet Settled										215,017					125,566
Treasury Stock, Value, Acquired and Not Yet Settled | $										$ 12,000					$ 8,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $									$ 67,000				$ 67,000
Common Stock, Dividends, Per Share, Declared | $ / shares								$ 6.73
Common stock dividends (USD per share) | $ / shares		$ 0.25	$ 0.25	$ 0.25	$ 0.25		$ 6.73
Dividend on Common Stock and Warrantholder payment | $		$ 24,000		$ 24,000			$ 649,000
Class A Common Stock
Class of Stock [Line Items]
Number of shares of common stock issued									99,961,433				99,961,433		95,708,401		78,754,269
Common stock, par value | $ / shares									$ 0.001				$ 0.001		$ 0.001		$ 0.001
Common stock, conversion ratio													1
Number of new shares issued from conversion												23,138	2,401,409	262,522
Number of shares called by each warrant																	1
Number of warrants exercised									10,380			930,881	1,705,368	4,303,727
Number of shares received									10,380			930,879	1,705,361	4,303,695
Class A common stock reserved for issuance									6,668				6,668
Common stock, shares authorized									1,000,000,000				1,000,000,000		1,000,000,000
Shares Sold During Public Offering, Including Existing Shareholders						9,240,073
Shares Issued, Price Per Share | $ / shares						$ 56.00
Class B Common Stock
Class of Stock [Line Items]
Number of shares of common stock issued									36,674				36,674		2,438,083		4,455,767
Common stock, par value | $ / shares									$ 0.001				$ 0.001		$ 0.001		$ 0.001
Common stock, conversion ratio													1
Number of shares converted									0			23,138	2,401,409	262,522
Number of shares called by each warrant																	1
Number of warrants exercised												0	0	100
Number of shares received														100
Common stock, shares authorized									1,000,000,000				1,000,000,000		200,000,000
Preferred Stock
Class of Stock [Line Items]
Preferred stock authorized shares									40,000,000				40,000,000
Warrant
Class of Stock [Line Items]
Warrants issued									304,593				304,593				16,789,972
Warrant, exercise price, per share | $ / shares																	$ 0.001
Subsequent Event
Class of Stock [Line Items]
Common stock dividends (USD per share) | $ / shares	$ 0.25