Deferred Revenue And Financing Receivables (Details) (USD $)	3 Months Ended
	Dec. 29, 2012 months	Dec. 31, 2011	Sep. 30, 2012
Deferred Revenue and Financing Receivables [Line Items]
Financing receivable, recorded investment, past due	$ 0
Financing receivable	43,709,000		42,463,000
Maximum payment terms on software purchases for credit-worthy customers (in months)	24
Amounts due from customers for contracts with extended payment terms	43,700,000		42,500,000
Sale of finance receivable	0	6,300,000
Accounts Receivable [Member]
Deferred Revenue and Financing Receivables [Line Items]
Current receivables from contracts	27,500,000		29,500,000
Other Assets [Member]
Deferred Revenue and Financing Receivables [Line Items]
Billed but uncollected maintenance receivable	84,000,000		110,700,000
Long-term receivables from contracts	16,200,000		13,000,000
Corporate Credit Quality Indicator [Member]
Deferred Revenue and Financing Receivables [Line Items]
Financing receivable	35,075,000		34,017,000
Internally Assigned Grade, Tier 2 [Member]
Deferred Revenue and Financing Receivables [Line Items]
Financing receivable	8,634,000		8,446,000
Internally Assigned Grade, Tier 3 [Member]
Deferred Revenue and Financing Receivables [Line Items]
Financing receivable	$ 0		$ 0