Revenue - Revenue Recognition (Details) - Revenue from Contract with Customer Benchmark	12 Months Ended
Sep. 30, 2020	Sep. 30, 2019
Transferred over Time
Revenue from External Customer [Line Items]
Revenue from sales orders, percentage	95.00%	94.00%
Transferred at Point in Time
Revenue from External Customer [Line Items]
Revenue from sales orders, percentage	5.00%	6.00%

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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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