Consolidated Condensed Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Dec. 28, 2013	Dec. 29, 2012
Cash flows from operating activities:
Net income	$ 95,509	$ 110,238
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	10,846	10,040
Stock compensation expense	17,713	15,760
Deferred income taxes	36,914	52,602
(Gain) loss on retirement or write-off of long-lived assets	165	(342)
Excess tax benefit related to the exercise of employee stock options	(5,113)	0
Other non-cash charges	3,996	2,872
Net change in operating assets and liabilities:
Accounts receivable, net	(39,500)	(126,626)
Inventories	49,315	(83,329)
Other assets	(5,785)	(2,270)
Accounts payable and other accrued liabilities	(1,062)	53,116
Deferred income	27	(1,649)
Income taxes payable	0	(35)
Net cash provided by operating activities	163,025	30,377
Cash flows from investing activities:
Proceeds from sale of available for sale marketable securities	69,394	96,139
Purchases of available for sale marketable securities	(152,005)	(38,076)
Purchases of property, equipment and software	(12,785)	(51,405)
Acquisition of Acoustic Technologies, net of cash obtained	(20,432)	0
Proceeds from sale of Apex assets	0	22,220
(Increase) decrease in deposits and other assets	(2,385)	493
Net cash (used in) provided by investing activities	(118,213)	29,371
Cash flows from financing activities:
Issuance of common stock, net of shares withheld for taxes	754	9,563
Repurchase and retirement of common stock	(42,391)	(47,856)
Excess tax benefit related to the exercise of employee stock options	5,113	0
Net cash used in financing activities	(36,524)	(38,293)
Net increase in cash and cash equivalents	8,288	21,455
Cash and cash equivalents at beginning of period	66,402	65,997
Cash and cash equivalents at end of period	$ 74,690	$ 87,452