Deferred Revenue And Financing Receivables (Details) (USD $)	3 Months Ended	9 Months Ended
	Jun. 30, 2012 months	Jun. 30, 2012	Jul. 02, 2011	Sep. 30, 2011
Financing Receivable, Recorded Investment, Past Due	$ 400,000	$ 400,000		$ 0
Financing receivable	39,122,000	39,122,000		57,941,000
Maximum payment terms on software purchases for credit-worthy customers (in months)	24
Amounts due from customers for contracts with extended payment terms	39,100,000	39,100,000		57,900,000
Sale of finance receivable	600,000	1,800,000	4,000,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	400,000	400,000
Accounts Receivable [Member]
Current receivables from contracts	28,800,000	28,800,000		41,900,000
Other Assets [Member]
Billed but uncollected maintenance receivable	72,300,000	72,300,000		93,000,000
Long-term receivables from contracts	10,300,000	10,300,000		16,000,000
Corporate Credit Quality Indicator [Member]
Financing receivable	28,606,000	28,606,000		38,575,000
Internally Assigned Grade, Tier 2 [Member]
Financing receivable	8,933,000	8,933,000		17,568,000
Internally Assigned Grade, Tier 3 [Member]
Financing receivable	$ 1,583,000	$ 1,583,000		$ 1,798,000