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Business Segment Information - Additional Information (Details) - Segment	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Number of reportable segments of entity (in segments)	4
Sales Revenue, Net | Customer Concentration Risk | Defense | DoD
Segment Reporting Information [Line Items]
Percentage of sales accounted for by Department of Defense (as a percent)	95.00%	96.00%	94.00%

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

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

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