CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Jan. 03, 2016	Dec. 28, 2014
Cash flows from operating activities:
Net income	$ 113,126	$ 54,643
Adjustments:
Depreciation	13,056	14,557
Amortization of intangible assets	5,628	5,572
Amortization of debt issuance cost and debt discount	2,164	0
Impairment of assets held for sale	0	8,471
Gain from divestiture	0	(16,840)
Gain on sale of property, plant and equipment	(325)	0
Stock-based compensation expense, net of amounts capitalized in inventory	25,878	16,562
Deferred tax provision (benefit)	(4,147)	50
Tax benefit from share-based payment arrangements	(115)	0
Changes in assets and liabilities:
Accounts receivable, net	8,319	(7,390)
Inventories	10,446	8,836
Prepayments and other assets	4,532	(854)
Accounts payable	(2,832)	718
Accrued compensation and related expenses	(5,427)	13,606
Deferred income on shipments to distributors	(7,171)	1,238
Income taxes payable and receivable	(70)	(352)
Other accrued liabilities and long-term liabilities	(4,079)	12,282
Net cash provided by operating activities	158,983	111,099
Cash flows from investing activities:
Acquisitions, net of cash acquired	(279,138)	0
Cash in escrow related to acquisitions	2,700	1,026
Proceeds from divestitures	0	15,300
Investment in convertible note	(2,020)	0
Purchases of property, plant and equipment, net	(12,541)	(12,418)
Purchases of intangible assets	(10,800)	0
Purchase of cost-method investment	0	(4,000)
Purchases of short-term investments	(313,246)	(163,292)
Proceeds from sales of short-term investments	466,890	76,848
Proceeds from maturities of short-term investments	80,695	64,298
Net cash used in investing activities	(67,460)	(22,238)
Cash flows from financing activities:
Proceeds from issuance of common stock	16,516	14,822
Prepayments for purchase of treasury stock	(45,000)	0
Proceeds from issuance of senior convertible notes, net of issuance costs	363,445	0
Purchase of convertible note hedge	(94,185)	0
Proceeds from issuance of warrants	56,847	0
Repurchase of common stock	(344,216)	(62,684)
Payment of acquisition related contingent consideration	0	(1,600)
Repayment of loans	(9,195)	0
Excess tax benefit from share-based payment arrangements	115	0
Net cash used in financing activities	(55,673)	(49,462)
Effect of exchange rates on cash and cash equivalents	197	(2,823)
Net increase in cash and cash equivalents	36,047	36,576
Cash and cash equivalents at beginning of period	116,945	91,211
Cash and cash equivalents at end of period	152,992	127,787
Noncash Investing Activity [Abstract]
Conversion of a cost method investment in convertible note to ordinary shares of stock	$ (2,020)	$ 0