Basis of Presentation and Significant Accounting Policies Basis of Presentation and Significant Accounting Policies - Financing Receivables (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	$ 2,235	$ 1,877
Allowance for losses on financing receivables	(200)	0
Customer support contracts, current and long-term, gross
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	384	0
Product receivables, gross
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables, gross	$ 2,051	$ 1,877