v2.4.0.6

Fair Value Of Financial Instruments (Tables)

9 Months Ended

12 Months Ended

Dec. 31, 2011

Mar. 26, 2011

Fair Value Of Financial Instruments [Abstract]

Schedule Of Cash And Marketable Securities

									Estimated Fair
				Gross		Gross			Value (Net
				Unrealized		Unrealized			Carrying
		Amortized Cost		Gains		Losses			Amount)
Cash and Cash Equivalents	$	11,666	$	-	$	-		$	11,666
Money-Market Funds		27,220		-		-			27,220
Corporate Debt Securities		59,694		10		(64	)		59,640
U.S. Treasury Securities		24,143		4		-			24,147
Agency Discount Notes		17,831		8		(1	)		17,838
Commercial Paper		19,840		2		(11	)		19,831
Total Securities	$	160,394	$	24	$	(76	)	$	160,342

									Estimated Fair
				Gross		Gross			Value (Net
				Unrealized		Unrealized			Carrying
		Amortized Cost		Gains		Losses			Amount)
Cash and Cash Equivalents	$	9,626	$	-	$	-		$	9,626
Money-Market Funds		17,700		-		-			17,700
Corporate Debt Securities		64,227		23		(38	)		64,212
U.S. Treasury Securities		45,768		13		-			45,781
Agency Discount Notes		16,588		5		(2	)		16,591
Commercial Paper		61,128		24		(7	)		61,145
Total Securities	$	215,037	$	65	$	(47	)	$	215,055

Schedule Of Fair Value Of Financial Assets

		Quoted Prices
		in Active		Significant
		Markets for		Other		Significant
		Identical		Observable		Unobservable
		Assets Level		Inputs		Inputs
Description		1		Level 2		Level 3		Total
Money-Market Funds	$	27,220	$	-	$	-	$	27,220
Corporate Debt Securities		-		59,640		-		59,640
U.S. Treasury Securities		24,147		-		-		24,147
Agency Discount Notes		-		17,838		-		17,838
Commercial Paper		-		19,831		-		19,831
	$	51,367	$	97,309	$	-	$	148,676

		Quoted Prices
		in Active		Significant
		Markets for		Other		Significant
		Identical		Observable		Unobservable
		Assets Level		Inputs		Inputs
Description		1		Level 2		Level 3		Total
Money-market funds	$	17,700	$	-	$	-	$	17,700
Corporate debt securities		-		64,212		-		64,212
U.S. Treasury securities		45,781		-		-		45,781
Agency discount notes		-		16,591		-		16,591
Commercial paper		-		61,145		-		61,145
	$	63,481	$	141,948	$	-	$	205,429

X

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19190-110258



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 6

-Footnote 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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X

- Definition

Tabular disclosure of unrealized gains and losses on investments.

+ References

No definition available.

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