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Summary of Significant Accounting Policies (Revenue Recognition) (Details)	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Hardware products
Concentration Risk [Line Items]
Percentage of revenue	91.70%	96.60%	95.90%
Service
Concentration Risk [Line Items]
Percentage of revenue	8.30%	3.40%	4.10%

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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