Reconciliation of Debt Issuance Costs and Debt Discounts to the Net Carrying Value for Each Debt Obligation (Excluding Line of Credit Arrangements) (Detail) - USD ($) $ in Thousands	Apr. 21, 2018	Dec. 30, 2017	Sep. 28, 2016	Apr. 03, 2012
Debt Instrument [Line Items]
Face Value	$ 811,250	$ 812,500
Debt Issuance Costs and Debt Discount	7,016	7,414
Net Carrying Value	804,234	805,086
Other Notes Payable
Debt Instrument [Line Items]
Face Value	11,250	12,500
Debt Issuance Costs and Debt Discount	260	333
Net Carrying Value	10,990	12,167
2026 Notes
Debt Instrument [Line Items]
Face Value	400,000	400,000	$ 400,000
Debt Issuance Costs and Debt Discount	4,845	5,022
Net Carrying Value	395,155	394,978
2022 Notes
Debt Instrument [Line Items]
Face Value	400,000	400,000		$ 400,000
Debt Issuance Costs and Debt Discount	1,911	2,059
Net Carrying Value	$ 398,089	$ 397,941