Borrowings - Amended and restated credit facility (Details)		3 Months Ended			9 Months Ended
	Jan. 20, 2017 USD ($)	Oct. 01, 2017 USD ($)	Apr. 02, 2017 USD ($)	Sep. 25, 2016 USD ($)	Oct. 01, 2017 USD ($)	Sep. 25, 2016 USD ($)
Line of Credit Facility [Line Items]
Loss on extinguishment of debt		$ 0		$ 0	$ 5,593,000	$ 19,261,000
2017 Credit Agreement
Line of Credit Facility [Line Items]
Debt instrument, stated interest rate	2.00%
Maximum leverage ratio	4.50
Maximum secured leverage ratio	3.50
Minimum interest coverage ratio	3.50
Line of credit, debt issuance cost		$ 12,000,000			$ 12,000,000
2017 Credit Agreement | Revolving Credit Facility
Line of Credit Facility [Line Items]
Debt instrument term	5 years
Maximum borrowing capacity	$ 1,000,000,000.0
2017 Credit Agreement | Term Loan
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 750,000,000.0
2013 Credit Agreement
Line of Credit Facility [Line Items]
Loss on extinguishment of debt			$ 400,000
London Interbank Offered Rate (LIBOR) | Minimum | 2017 Credit Agreement
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.25%
London Interbank Offered Rate (LIBOR) | Maximum | 2017 Credit Agreement
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.50%
Federal Funds Effective Swap Rate | 2017 Credit Agreement
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.50%
Adjusted LIBOR | 2017 Credit Agreement
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.00%
Adjusted LIBOR | Minimum | 2017 Credit Agreement
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.25%
Adjusted LIBOR | Maximum | 2017 Credit Agreement
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.50%