Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Sep. 28, 2013		Sep. 29, 2012
Cash flows from operating activities:
Net income	$ 298,484		$ 253,268
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	28,009		28,754
Amortization	9,770		8,455
Stock-based compensation	44,014		36,854
Net (gain) loss on sale of available-for-sale securities	148		(1,741)
Amortization of debt discount on convertible debentures	8,073		7,897
Provision for deferred income taxes	43,754		35,900
Excess tax benefit from stock-based compensation	(18,914)		(4,766)
Others	(691)		643
Changes in assets and liabilities:
Accounts receivable, net	(48,364)		(7,305)
Inventories	17,634		675
Prepaid expenses and other current assets	(6,667)		5,931
Other assets	(7,016)		(1,750)
Accounts payable	(16,181)		(17,865)
Accrued liabilities	71,660		1,444
Income taxes payable	(72,380)		(2,773)
Deferred income on shipments to distributors	15,457		(19,035)
Net cash provided by operating activities	399,152		360,316
Cash flows from investing activities:
Purchases of available-for-sale securities	(2,178,565)		(2,020,793)
Proceeds from sale and maturity of available-for-sale securities	1,767,178		1,766,216
Purchases of property, plant and equipment	(19,742)		(15,978)
Other investing activities	37,217		(27,649)
Net cash used in investing activities	(393,912)		(298,204)
Cash flows from financing activities:
Repurchases of common stock	(69,981)		(178,148)
Proceeds from issuance of common stock through various stock plans	125,968		32,888
Payment of dividends to stockholders	(133,205)		(115,321)
Excess tax benefit from stock-based compensation	18,914		4,766
Net cash used in financing activities	(58,304)		(255,815)
Net decrease in cash and cash equivalents	(53,064)		(193,703)
Cash and cash equivalents at beginning of period	623,558	[1]	788,822
Cash and cash equivalents at end of period	570,494		595,119
Supplemental disclosure of cash flow information:
Interest paid	18,651		18,651
Income taxes paid, net of refunds	$ 65,903		$ 5,822

[1] Derived from audited financial statements