Deferred Revenue and Financing Receivables (Details) (USD $)	6 Months Ended
	Mar. 29, 2014	Mar. 30, 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	63,400,000		53,100,000
Receivables past due			0
Financing receivable greater than 90 days past due	300,000
Financing receivable	63,420,000		53,123,000
Reserve for credit losses	0
Sale of finance receivable	12,000,000	0
S&P bond rating BBB-1 and above-Tier 1
Deferred Revenue and Financing Receivables [Line Items]
Financing receivable	44,246,000		42,189,000
Internal Credit Assessment-Tier 2
Deferred Revenue and Financing Receivables [Line Items]
Financing receivable	19,174,000		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	46,700,000		36,100,000
Other Assets
Deferred Revenue and Financing Receivables [Line Items]
Billed but uncollected maintenance receivable	107,200,000		108,600,000
Long-term receivables from contracts	$ 16,700,000		$ 17,000,000