Significant Accounting Policies Concentration of Risk (Details)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]
Entity-Wide Revenue, Major Customer, Percentage	23.00%	24.00%	22.00%
Accounts Receivable, Major Customer, Percentage	13.00%	16.00%
Disclosure on Geographic Areas, Revenue from External Customers Attributed to Foreign Countries, Percent	46.00%	44.00%	44.00%