Segment Information (Revenue By Product Segment) (Details) (USD $) In Thousands	12 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue	$ 1,166,949	$ 1,010,049	$ 938,185
Desktop [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue	625,086	542,291	545,007
Enterprise [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenue	$ 541,863	$ 467,758	$ 393,178

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 03

-Paragraph 1

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Name:	us-gaap_SalesRevenueNet
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration