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Fair Value Measurements (Tables)

3 Months Ended

Jun. 30, 2011

Fair Value Measurements

Schedule Of Assets Carried At Fair Value

	Total Carrying Value	Quoted Prices in Active Markets (Level 1)	Using Significant Other Observable Inputs (Level 2)	Using Significant Unobservable Inputs (Level 3)
June  30, 2011:
Assets:
Cash equivalents	$      99,546	$                 99,546	$                                  —	$                              —
Short-term commercial paper	5,373	—	5,373	—
Short-term government-backed securities..	20,521	—	20,521	—
	Total Carrying Value	Quoted Prices in Active Markets (Level 1)	Using Significant Other Observable Inputs (Level 2)	Using Significant Unobservable Inputs (Level 3)
March 31, 2011:
Assets:
Cash equivalents	$      49,837	$                 49,837	$                                  —	$                              —
Short-term government-backed securities	76,371	—	76,371	—
Short-term commercial paper	39,755	—	39,755	—
Derivatives	3,087	—	3,087	—

X

- Definition

This element represents disclosure of the total amount of gains or losses for the period which are included in earnings or resulted in a change to net assets which gains or losses have arisen from the use of significant unobservable inputs (Level 3) to measure the fair value of assets and liabilities. such gains or losses are attributable to the change in unrealized gains or losses relating to those assets and liabilities so valued which are still held at the reporting date and which change should also be considered for disclosure; it may be expected that a description of Where those unrealized gains or losses are reported in the statement of income or the statement of financial position would also be disclosed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph c(1)

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-Subparagraph d

+ Details

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Namespace Prefix:	us-gaap
Data Type:	us-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_MarketableSecuritiesAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration