Deferred Revenue and Financing Receivables (Details) - USD ($) $ in Thousands	9 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Sep. 30, 2014
Deferred Revenue and Financing Receivables [Line Items]
Financing Receivable, Net	$ 28,145		$ 58,141
Maximum payment terms on software purchases for credit-worthy customers (in months)	24 months
Reserve for credit losses	$ 0		0
Sale of finance receivable	3,000	$ 16,500
S&P bond rating BBB-1 and above-Tier 1
Deferred Revenue and Financing Receivables [Line Items]
Financing Receivable, Net	17,143		41,152
Internal Credit Assessment-Tier 2
Deferred Revenue and Financing Receivables [Line Items]
Financing Receivable, Net	11,002		16,989
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	24,800		44,600
Other Assets
Deferred Revenue and Financing Receivables [Line Items]
Billed but uncollected maintenance receivable	88,800		116,200
Long-term receivables from contracts	$ 3,300		$ 13,500