Debt and Credit Facility (Details 1) $ / shares in Units, shares in Millions	3 Months Ended	12 Months Ended
	Apr. 01, 2017 USD ($) $ / shares shares	Apr. 01, 2017 USD ($) $ / shares shares	Apr. 02, 2016 USD ($)	Mar. 28, 2015 USD ($)	Jul. 03, 2010 USD ($)
Short-term Debt [Line Items]
Extinguishment of Debt, Amount		$ 488,000
Amortization of Debt Discount (Premium)		11,692,000	$ 12,048,000	$ 12,022,000
2017 Convertible Notes
Short-term Debt [Line Items]
Debt Instrument, Face Amount	$ 457,918,000	$ 457,918,000	600,000,000		$ 600,000,000
Debt Instrument, Interest Rate, Stated Percentage					2.625%
Debt Instrument, Maturity Date		Jun. 15, 2017
Debt Instrument, Convertible, Conversion Ratio		34.6495
Base conversion, block amount of senior convertible debenture		$ 1,000
Convertible debt, conversion price | $ / shares	$ 28.86	$ 28.86
Maximum number of common shares to be purchased under call option | shares	15.9	15.9
Price Per Share To Be Purchase By Company Under Call Option | $ / shares		$ 28.86
Warrants, number of shares the holders have the right to purchase | shares	20.8	20.8
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 40.89	$ 40.89
Extinguishment of Debt, Amount		$ 142,100,000
Debt Conversion, Converted Instrument, Shares Issued | shares	2.5
Stock Redeemed or Called During Period, Shares | shares		2.5
Convertible Debt Payment Allocated to Liability		$ 142,900,000
Amount allocated to Equity Component for debt conversion		149,100,000
Gains (Losses) on Extinguishment of Debt		1,700,000
Debt Instrument, Unamortized Discount	$ 1,977,000	1,977,000	18,135,000
Hedge Accounting Adjustment - Sale Of Interest Rate Swap	571,000	571,000	5,241,000
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Net	(184,000)	(184,000)	(1,689,000)
Debt Instrument Carrying Amount Of Liability Component	456,328,000	$ 456,328,000	585,417,000
Debt Instrument, Convertible, Remaining Discount Amortization Period		2 months 19 days
Debt instrument, Convertible, If-converted Value		$ 935,800,000
Interest Expense, Debt, Excluding Amortization		14,652,000	15,750,000	15,750,000
Amortization of Financing Costs		1,398,000	1,448,000	1,448,000
Amortization of Debt Discount (Premium)		10,670,000	11,052,000	11,052,000
Interest Expense, Debt		26,720,000	28,250,000	$ 28,250,000
Debt Instrument, Convertible, Carrying Amount of Equity Component	$ 50,688,000	$ 50,688,000	$ 66,415,000