Deferred Revenue and Financing Receivables (Details) - USD ($) $ in Thousands	9 Months Ended
	Jul. 02, 2016	Sep. 30, 2015
Deferred Revenue and Financing Receivables [Line Items]
Financing Receivable, Net	$ 12,070	$ 27,434
Maximum payment terms on software purchases for credit-worthy customers (in months)	24 months
Financing Receivable, Recorded Investment, Past Due	$ 2,102	528
Reserve for credit losses	0	0
S&P bond rating BBB-1 and above-Tier 1
Deferred Revenue and Financing Receivables [Line Items]
Financing Receivable, Net	9,447	16,841
Internal Credit Assessment-Tier 2
Deferred Revenue and Financing Receivables [Line Items]
Financing Receivable, Net	2,623	10,593
Internal Credit Assessment-Tier 3
Deferred Revenue and Financing Receivables [Line Items]
Financing Receivable, Net	0	0
Accounts Receivable
Deferred Revenue and Financing Receivables [Line Items]
Current receivables from contracts	9,100	21,800
Other Assets
Deferred Revenue and Financing Receivables [Line Items]
Billed but uncollected support and subscription related receivable	111,100	129,300
Long-term receivables from contracts	$ 3,000	$ 5,600