Deferred Revenue And Financing Receivables (Details) (USD $)	3 Months Ended	6 Months Ended		12 Months Ended
	Mar. 31, 2012 months	Mar. 31, 2012	Apr. 02, 2011	Sep. 30, 2011
Financing Receivable, Recorded Investment, Past Due	$ 1,000,000	$ 1,000,000		$ 0
Financing receivable	35,041,000	35,041,000		57,730,000
Maximum payment terms on software purchases for credit-worthy customers (in months)	24
Amounts due from customers for contracts with extended payment terms	35,000,000	35,000,000		57,700,000
Reserve for credit losses		0		0
Uncollectible financing receivables written off	0			0
Sale of finance receivable		1,200,000	0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	300,000	300,000
Accounts Receivable [Member]
Current receivables from contracts	26,400,000	26,400,000		41,700,000
Other Assets [Member]
Billed but uncollected maintenance receivable	105,400,000	105,400,000		93,000,000
Long-term receivables from contracts	8,600,000	8,600,000		16,000,000
Corporate Credit Quality Indicator [Member]
Financing receivable	22,143,000	22,143,000		36,639,000
Internally Assigned Grade, Tier 2 [Member]
Financing receivable	12,089,000	12,089,000		19,293,000
Internally Assigned Grade, Tier 3 [Member]
Financing receivable	$ 809,000	$ 809,000		$ 1,798,000