Revenue - Revenue Recognition (Details) - Product Concentration Risk	12 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Revenue from Contract with Customer, Product and Service Benchmark \| Transferred over Time
Revenue from External Customer [Line Items]
Revenue from sales orders, percentage	93.00%	95.00%
Revenue from Contract with Customer Benchmark \| Transferred at Point in Time
Revenue from External Customer [Line Items]
Revenue from sales orders, percentage	7.00%	5.00%

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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