Total Debt - Credit Agreements (Details)		3 Months Ended	12 Months Ended
	Dec. 27, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 26, 2017 USD ($)
Debt Instrument [Line Items]
Long-term debt		$ 1,129,200,000	$ 884,300,000
Line of Credit
Debt Instrument [Line Items]
Coverage ratio, prior year permitted acquisition amount	$ 100,000,000.0
Line of Credit | Minimum
Debt Instrument [Line Items]
Maximum leverage ratio	4.0
Minimum interest coverage ratio	2.5
Line of Credit | Maximum
Debt Instrument [Line Items]
Maximum leverage ratio	4.5
Line of Credit | 2014 Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 500,000,000
Revolver | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 700,000,000.0
Available borrowing capacity			$ 693,100,000
Commitment fee percentage			0.20%
Debt issuance costs	$ 1,600,000
Amortization period of debt issuance costs	5 years
Revolver | Line of Credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Margin on variable rate			150.00%
Term Loan B | Line of Credit | Term Loan B due 2022
Debt Instrument [Line Items]
Face amount of debt issuance	$ 400,000,000.0
Required payment as a percentage of original balance	0.25%
Required periodic payment	$ 1,000,000
Debt issuance costs	$ 5,100,000
Amortization period of debt issuance costs	7 years
Term Loan B | Line of Credit | Term Loan B due 2022 | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Margin on variable rate			200.00%
Term Loan B | Line of Credit | 2014 Credit Agreement
Debt Instrument [Line Items]
Amortization of debt issuance costs		400,000
Letter of credit | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 50,000,000.0
Long-term debt		$ 6,900,000
Swing line of credit | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 50,000,000.0