Derivatives and Hedging Activities - Summary of Derivative Assets and Liability Balance by Type of Financial Instrument Before and After Effects of Offsetting (Detail) - USD ($) $ in Millions	Sep. 26, 2015	Jun. 27, 2015
Derivative [Line Items]
Gross Amounts of Recognized Assets		$ 0.2
Gross Amounts Offset in the Consolidated Balance Sheet, Assets	$ 0.0	0.0
Net Amounts of Assets Presented in the Consolidated Balance Sheet		0.2
Gross Amounts Not Off the Consolidated Balance Sheet - Financial Instruments, Assets		0.2
Gross Amounts Not Off the Consolidated Balance Sheet - Cash Collateral Pledged, Assets	0.0	0.0
Net Amounts, Assets	0.0	0.0
Gross Amounts of Recognized Liabilities	12.0	9.1
Gross Amounts Offset in the Consolidated Balance Sheet, Liabilities	0.0	0.0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	12.0	9.1
Gross Amounts Not Off the Consolidated Balance Sheet - Financial Instruments, Liabilities		0.2
Gross Amounts Not Off the Consolidated Balance Sheet - Cash Collateral Pledged, Liabilities	0.0	0.0
Net Amounts, Liabilities	12.0	8.9
Interest Rate Swaps [Member]
Derivative [Line Items]
Gross Amounts of Recognized Assets		0.2
Gross Amounts Offset in the Consolidated Balance Sheet, Assets	0.0	0.0
Net Amounts of Assets Presented in the Consolidated Balance Sheet		0.2
Gross Amounts Not Off the Consolidated Balance Sheet - Financial Instruments, Assets		0.2
Gross Amounts Not Off the Consolidated Balance Sheet - Cash Collateral Pledged, Assets	0.0	0.0
Net Amounts, Assets	0.0	0.0
Gross Amounts of Recognized Liabilities	9.1	7.4
Gross Amounts Offset in the Consolidated Balance Sheet, Liabilities	0.0	0.0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	9.1	7.4
Gross Amounts Not Off the Consolidated Balance Sheet - Financial Instruments, Liabilities		0.2
Gross Amounts Not Off the Consolidated Balance Sheet - Cash Collateral Pledged, Liabilities	0.0	0.0
Net Amounts, Liabilities	9.1	7.2
Diesel Fuel Collars [Member]
Derivative [Line Items]
Gross Amounts Offset in the Consolidated Balance Sheet, Assets	0.0	0.0
Gross Amounts Not Off the Consolidated Balance Sheet - Cash Collateral Pledged, Assets	0.0	0.0
Net Amounts, Assets	0.0	0.0
Gross Amounts of Recognized Liabilities	2.9	1.7
Gross Amounts Offset in the Consolidated Balance Sheet, Liabilities	0.0	0.0
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet	2.9	1.7
Gross Amounts Not Off the Consolidated Balance Sheet - Cash Collateral Pledged, Liabilities	0.0	0.0
Net Amounts, Liabilities	$ 2.9	$ 1.7