Schedule of Derivatives Designated as Hedging Instruments (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			12 Months Ended
	Mar. 29, 2015		Mar. 30, 2014	Dec. 28, 2014
Foreign Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized In AOCI	$ (0.3)	[1]
Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized In Income	0.1		2.1
Amount of Gain (Loss) Reclassified from AOCI	0.1		2.1
Designated as Hedging Instrument | Foreign Exchange Contracts | Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized In Income	2.2		0.1
Amount of Gain (Loss) Reclassified from AOCI	2.2		0.1
Designated as Hedging Instrument | Foreign Exchange Contracts | Expenses
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized In Income	(2.1)		2.0
Amount of Gain (Loss) Reclassified from AOCI	(2.1)		2.0
Designated as Hedging Instrument | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	236.8			262.2
Fair Value	(0.3)			(2.8)
Amount of Gain (Loss) Recognized In AOCI	(0.3)			(2.8)
Designated as Hedging Instrument | Cash Flow Hedging | Derivatives For Forecasted Revenues | Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	54.4			43.3
Fair Value	3.6			2.7
Amount of Gain (Loss) Recognized In AOCI	3.6			2.7
Designated as Hedging Instrument | Cash Flow Hedging | Derivatives For Forecasted Expenses | Current Assets
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	50.5			13.7
Fair Value	0.1
Amount of Gain (Loss) Recognized In AOCI	0.1
Designated as Hedging Instrument | Cash Flow Hedging | Derivatives For Forecasted Expenses | Current Liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	131.9			205.2
Fair Value	(4.0)			(5.5)
Amount of Gain (Loss) Recognized In AOCI	$ (4.0)			$ (5.5)

[1] This amount is inclusive of both realized and unrealized gains and losses recognized in OCI.