Deferred Revenue and Financing Receivables (Details) - USD ($) $ in Thousands	6 Months Ended
	Apr. 02, 2016	Sep. 30, 2015
Deferred Revenue and Financing Receivables [Line Items]
Financing Receivable, Net	$ 13,667	$ 27,434
Maximum payment terms on software purchases for credit-worthy customers (in months)	24 months
Financing Receivable, Recorded Investment, Past Due	$ 1,815	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	10,406	16,841
Internal Credit Assessment-Tier 2
Deferred Revenue and Financing Receivables [Line Items]
Financing Receivable, Net	3,261	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	10,600	21,800
Other Assets
Deferred Revenue and Financing Receivables [Line Items]
Billed but uncollected support and subscription related receivable	154,700	129,300
Long-term receivables from contracts	$ 3,100	$ 5,600