Geographic Sales and Significant Customers (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Revenue	$ 370,302	$ 352,634	$ 1,085,985	$ 1,014,688
Net Revenue [Member] | Geographic Concentration [Member]
Segment Reporting Information [Line Items]
Number of distributors	3		3	2
Products [Member] | Geographic Concentration [Member]
Segment Reporting Information [Line Items]
Number of distributors		2
Accounts Receivable [Member] | Geographic Concentration [Member]
Segment Reporting Information [Line Items]
Number of distributors			1	2
Americas [Member]
Segment Reporting Information [Line Items]
Revenue	214,106	201,457	616,914	588,896
United States [Member]
Segment Reporting Information [Line Items]
Revenue	198,635	187,404	565,883	539,609
Other [Member]
Segment Reporting Information [Line Items]
Revenue	15,471	14,053	51,031	49,287
EMEA [Member]
Segment Reporting Information [Line Items]
Revenue	77,627	74,720	241,415	214,140
Japan [Member]
Segment Reporting Information [Line Items]
Revenue	21,846	23,474	61,741	66,623
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenue	$ 56,723	$ 52,983	$ 165,915	$ 145,029
Worldwide Distributor 1 [Member] | Net Revenue [Member] | Geographic Concentration [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage	13.90%	17.30%	15.70%	17.30%
Worldwide Distributor 1 [Member] | Accounts Receivable [Member] | Geographic Concentration [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage			16.60%	11.00%
Worldwide Distributor 2 [Member] | Net Revenue [Member] | Geographic Concentration [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage	15.60%	14.80%	14.80%	14.20%
Worldwide Distributor 2 [Member] | Accounts Receivable [Member] | Geographic Concentration [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage				13.50%
Worldwide Distributor 3 [Member] | Net Revenue [Member] | Geographic Concentration [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage	11.20%		11.10%