Borrowings - 3.875% Convertible Senior Subordinated Notes (Details) - USD ($)		3 Months Ended			9 Months Ended		12 Months Ended
	Jan. 05, 2017	Oct. 01, 2017	Apr. 02, 2017	Sep. 25, 2016	Oct. 01, 2017	Sep. 25, 2016	Dec. 31, 2016
Short-term Debt [Line Items]
Repayments of debt					$ 747,576,000	$ 714,487,000
Conversion of convertible notes, shares issued upon conversion		500,000		1,300,000	500,000	1,900,000
Loss on extinguishment of debt		$ 0		$ 0	$ 5,593,000	$ 19,261,000
Shares delivered to the company by the counterparties to the convertible note hedge transactions					120,000
Number of securities called by warrants or rights (in shares)		724,648			724,648
Exercise Price of warrants (in USD per share)		$ 74.65			$ 74.65
Intrinsic value of warrants		$ 121,300,000			$ 121,300,000
Class Of Warrant Term							180 days
3.875% Convertible Senior Subordinated Notes due 2017 | Senior Notes
Short-term Debt [Line Items]
Extinguishment of debt, amount	$ 91,700,000
Principal amount of convertible debt	1,000
Repayments of debt	93,200,000
Repayments of debt, accrued interest	$ 1,500,000
Issued and delivered common stock to Holders	930,000
Loss on extinguishment of debt			$ 5,200,000
Convertible Debt [Member] | Convertible Notes Payable [Member] | Conversion [Member]
Short-term Debt [Line Items]
Conversion of convertible notes, shares issued upon conversion					500,000
Shares delivered to the company by the counterparties to the convertible note hedge transactions					500,000
Short-term Debt		44,300,000			$ 44,300,000
Aggregate principal amount of Convertible Notes tendered to the Company for conversion		$ 44,200,000			$ 44,200,000