Debt and Credit Facility (Details 2) $ / shares in Units, shares in Millions	3 Months Ended		6 Months Ended
	Sep. 26, 2015 USD ($) $ / shares shares	Sep. 27, 2014 USD ($)	Sep. 26, 2015 USD ($) $ / shares shares	Sep. 27, 2014 USD ($)	Mar. 28, 2015 USD ($)
Short-term Debt [Line Items]
Amortization of Debt Discount (Premium)			$ 6,019,000	$ 6,008,000
Two And Six Two Five Percent Senior Convertible Debentures [Member]
Short-term Debt [Line Items]
Maximum number of common shares to be purchased under call option | shares	20.5		20.5
Debt Instrument, Convertible, Remaining Discount Amortization Period			1 year 8 months 19 days
Debt Instrument, Face Amount	$ 600,000,000		$ 600,000,000		$ 600,000,000
Debt Instrument, Convertible, Conversion Ratio	34.1754
Debt Instrument, Unamortized Discount	$ 25,907,000		25,907,000		33,679,000
Hedge Accounting Adjustment - Sale Of Interest Rate Swap	7,487,000		7,487,000		9,732,000
Debt Instrument Carrying Amount Of Liability Component	581,580,000		581,580,000		576,053,000
Debt Instrument, Convertible, Carrying Amount of Equity Component	66,415,000		66,415,000		$ 66,415,000
Interest Expense, Debt, Excluding Amortization	3,938,000	$ 3,938,000	7,875,000	7,875,000
Amortization of Financing Costs	362,000	362,000	724,000	724,000
Amortization of Debt Discount (Premium)	2,763,000	2,763,000	5,526,000	5,526,000
Interest Expense, Debt	7,063,000	$ 7,063,000	$ 14,125,000	$ 14,125,000
Base conversion, block amount of senior convertible debenture	$ 1,000
Warrants, number of shares the holders have the right to purchase | shares	20.5		20.5
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 41.45		$ 41.45
Convertible debt, conversion price | $ / shares	$ 29.2608		$ 29.2608
Debt Instrument, Convertible, If-converted Value in Excess of Principal	$ 859,100,000		$ 859,100,000