Deferred Revenue and Financing Receivables (Details) (USD $)	9 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Sep. 30, 2013
Deferred Revenue and Financing Receivables [Line Items]
Allowance for Doubtful Accounts Receivable			$ 0
Maximum payment terms on software purchases for credit-worthy customers (in months)	24 months
Amounts due from customers for contracts with extended payment terms	61,300,000		53,100,000
Receivables past due	0
Financing receivable	61,323,000		53,123,000
Reserve for credit losses	0
Sale of finance receivable	16,500,000	8,500,000
S&P bond rating BBB-1 and above-Tier 1
Deferred Revenue and Financing Receivables [Line Items]
Financing receivable	38,617,000		42,189,000
Internal Credit Assessment-Tier 2
Deferred Revenue and Financing Receivables [Line Items]
Financing receivable	22,706,000		10,934,000
Internal Credit Assessment-Tier 3
Deferred Revenue and Financing Receivables [Line Items]
Financing receivable	0		0
Accounts Receivable
Deferred Revenue and Financing Receivables [Line Items]
Current receivables from contracts	46,900,000		36,100,000
Other Assets
Deferred Revenue and Financing Receivables [Line Items]
Billed but uncollected maintenance receivable	87,900,000		108,600,000
Long-term receivables from contracts	$ 14,400,000		$ 17,000,000