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Major Customers and Sales by Country - Schedule of Revenues by Geographic Region (Details) - Net Revenues - Geographic Concentration Risk	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Revenue, Major Customer [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%
United States
Revenue, Major Customer [Line Items]
Concentration risk, percentage	35.00%	21.00%	22.00%
Other Americas
Revenue, Major Customer [Line Items]
Concentration risk, percentage	6.00%	3.00%	3.00%
Total Americas
Revenue, Major Customer [Line Items]
Concentration risk, percentage	41.00%	24.00%	25.00%
China
Revenue, Major Customer [Line Items]
Concentration risk, percentage	18.00%	30.00%	23.00%
Malaysia
Revenue, Major Customer [Line Items]
Concentration risk, percentage	5.00%	8.00%	8.00%
Taiwan
Revenue, Major Customer [Line Items]
Concentration risk, percentage	10.00%	9.00%	10.00%
Other Asia
Revenue, Major Customer [Line Items]
Concentration risk, percentage	8.00%	5.00%	9.00%
Total Asia
Revenue, Major Customer [Line Items]
Concentration risk, percentage	41.00%	52.00%	50.00%
Germany
Revenue, Major Customer [Line Items]
Concentration risk, percentage	8.00%	10.00%	9.00%
Other Europe
Revenue, Major Customer [Line Items]
Concentration risk, percentage	10.00%	14.00%	16.00%
Total Europe
Revenue, Major Customer [Line Items]
Concentration risk, percentage	18.00%	24.00%	25.00%

X

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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No definition available.

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