Geographic Sales And Significant Customers (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Revenue	$ 395,329	$ 370,302	$ 350,232	$ 365,451	$ 362,559	$ 352,634	$ 339,622	$ 322,432	$ 1,481,314	$ 1,377,247	$ 1,151,834
United States [Member]
Segment Reporting Information [Line Items]
Revenue									777,516	729,238	627,806
Other Americas [Member]
Segment Reporting Information [Line Items]
Revenue									74,391	64,144	49,062
Americas [Member]
Segment Reporting Information [Line Items]
Revenue									851,907	793,382	676,868
EMEA [Member]
Segment Reporting Information [Line Items]
Revenue									327,109	294,191	240,453
Japan [Member]
Segment Reporting Information [Line Items]
Revenue									83,051	90,521	74,824
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenue									$ 219,247	$ 199,153	$ 159,689
Geographic Concentration Risk [Member] | Sales Revenue, Product Line [Member]
Segment Reporting Information [Line Items]
Number of distributors									1
Geographic Concentration Risk [Member] | Accounts Receivable [Member]
Segment Reporting Information [Line Items]
Number of distributors									1	2
Avnet Technology Solutions [Member] | Accounts Receivable [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage										13.40%
Ingram Micro Inc [Member] | Accounts Receivable [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage									18.60%	12.00%
Ingram Micro Inc [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Product Line [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage									15.70%	13.80%	10.70%
Avnet Technology Solutions [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Product Line [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage									16.60%	17.10%	18.10%
Worldwide Distributor3 [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Product Line [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage									11.80%