CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Income Statement
Net sales	$ 383,298		$ 340,602		$ 735,432		$ 715,109
Cost of sales	189,103	[1]	143,899	[1]	336,440	[1]	296,949	[1]
Gross profit	194,195		196,703		398,992		418,160
Operating expenses:
Research and development	64,082	[1]	45,383	[1]	112,908	[1]	90,681	[1]
Selling, general and administrative	71,767	[1]	50,997	[1]	127,359	[1]	107,516	[1]
Amortization of acquired intangible assets	27,858		2,703		31,904		5,483
Special charges	22,394		0		22,394		0
Total operating expenses	186,101		99,083		294,565		203,680
Operating income	8,094		97,620		104,427		214,480
Losses on equity method investments	(32)		(13)		(153)		(74)
Other income (expense):
Interest income	3,744		4,028		8,076		8,034
Interest expense	(10,758)		(8,911)		(19,906)		(16,926)
Other, net	1,071		(2,454)		539		(1,418)
Income before income taxes	2,119		90,270		92,983		204,096
Income tax provision	23,303		10,983		35,457		25,516
Net (loss) income	$ (21,184)		$ 79,287		$ 57,526		$ 178,580
Basic net (loss) income per common share	$ (0.11)		$ 0.42		$ 0.30		$ 0.94
Diluted net (loss) income per common share	$ (0.11)		$ 0.40		$ 0.28		$ 0.88
Dividends declared per common share	$ 0.351		$ 0.347		$ 0.701		$ 0.693
Basic common shares outstanding	194,060		190,809		193,756		190,461
Diluted common shares outstanding	194,060		200,199		204,627		202,383

[1] Includes share-based compensation expense as follows:Cost of sales 2,614 1,608 3,924 3,007 Research and development 6,358 3,556 10,390 6,969Selling, general and administrative 11,581 4,320 16,225 8,532