Deferred Revenue And Financing Receivables (Details) (USD $)	9 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Sep. 30, 2012
Deferred Revenue and Financing Receivables [Line Items]
Maximum payment terms on software purchases for credit-worthy customers (in months)	24 months
Amounts due from customers for contracts with extended payment terms	$ 65,800,000		$ 42,500,000
Receivables past due	2,500,000		0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	700,000
Financing receivable	65,815,000		42,463,000
Reserve for credit losses	0
Sale of finance receivable	8,500,000	1,800,000
S&P bond rating BBB-1 and above-Tier 1
Deferred Revenue and Financing Receivables [Line Items]
Financing receivable	60,726,000		34,017,000
Internal Credit Assessment-Tier 2
Deferred Revenue and Financing Receivables [Line Items]
Financing receivable	5,089,000		8,446,000
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	47,200,000		29,500,000
Other Assets
Deferred Revenue and Financing Receivables [Line Items]
Billed but uncollected maintenance receivable	71,100,000		110,700,000
Long-term receivables from contracts	$ 18,600,000		$ 13,000,000