Debt and Credit Facility (Details 2) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Apr. 01, 2017
Short-term Debt [Line Items]
Repayments of Convertible Debt	$ 457,918,000	$ 0
Stock Issued During Period, Shares, Conversion of Convertible Securities	9.0
Amortization of Debt Discount (Premium)	$ 1,676,000	3,016,000
Shares received from exercise of call options	9.0
Long-term Debt, Excluding Current Maturities	$ 1,737,410,000		$ 995,247,000
Two And Six Two Five Percent Senior Convertible Debentures [Member]
Short-term Debt [Line Items]
Debt Instrument, Face Amount	0		457,918,000
Debt Instrument, Unamortized Discount	0		(1,977,000)
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Net	0		(184,000)
Interest Expense, Debt, Excluding Amortization	2,300,000	3,938,000
Amortization of Debt Issuance Costs	184,000	362,000
Amortization of Debt Discount (Premium)	1,406,000	2,763,000
Interest Expense, Debt	$ 3,890,000	$ 7,063,000
Warrants, number of shares the holders have the right to purchase	21.1
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 40.38
Hedge Accounting Adjustment - Sale Of Interest Rate Swap	$ 0		571,000
Long-term Debt, Excluding Current Maturities	0		456,328,000
Debt Instrument, Convertible, Carrying Amount of Equity Component	$ 0		$ 50,688,000