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Stock-Based Compensation (Employee Stock-Based Compensation Expenses Included In Consolidated Statements Of Income) (Details) (USD $) In Thousands	3 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Employee stock-based compensation expense	$ 3,466	$ 3,578
Cost Of Revenues [Member]
Employee stock-based compensation expense	329	383
Research And Development [Member]
Employee stock-based compensation expense	660	468
Selling General And Administrative Expense [Member]
Employee stock-based compensation expense	$ 2,477	$ 2,727

X

- Definition

Represents the expense recognized during the period arising from share-based compensation arrangements (for example, shares of stock, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64
-Subparagraph b

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph g(1)

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

+ Details

Name:	us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration