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Revenues - Remaining Performance Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Remaining Performance Obligations
Contract assets	$ 90,700	$ 66,700	$ 68,800
Contract liabilities	224,700	90,300	83,800
Accounts receivable	253,554	$ 222,101	$ 189,300
Revenue recognized	60,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01
Remaining Performance Obligations
Remaining performance obligations amount	$ 1,133,600
Percentage of remaining performance obligation expected to be recognized	64.00%
Revenue remaining performance obligation expected timing of satisfaction, Period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-10-01
Remaining Performance Obligations
Percentage of remaining performance obligation expected to be recognized	92.00%
Revenue remaining performance obligation expected timing of satisfaction, Period	3 years

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