Summary of Significant Accounting Policies (Revenue Recognition) (Details)	12 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Hardware products
Concentration Risk [Line Items]
Percentage of revenue	83.70%	91.70%	96.60%
Services and solutions
Concentration Risk [Line Items]
Percentage of revenue	16.30%	8.30%	3.40%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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