Geographical Information (Narrative) (Details)		3 Months Ended		6 Months Ended		369 Months Ended
	Dec. 10, 2014 segment	Mar. 31, 2016 customers	Mar. 31, 2015 customers	Mar. 31, 2016 segment customers	Mar. 31, 2015 customers	Sep. 30, 2014 segment	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of reporting segments | segment	1			1		2
Number of customers | customers		2,000	3	2	4
Percentage of long-lived assets located in the United States		50.00%		50.00%			38.00%
Customer Concentration Risk [Member] | Sales Revenue, Segment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Concentration risk percentage		51.00%	54.00%	51.00%	62.00%