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v3.21.1

Commitments and Contingencies (Details) $ in Millions | 6 Months Ended
--- | ---
Mar. 31, 2021 USD ($)
Guarantee Obligations [Line Items] |
Additional bonding capacity | $ 276.6
Cash collateral required for guarantees, period (greater than) | 2 years
Facility Agreement | Powell (UK) Limited |
Guarantee Obligations [Line Items] |
Guarantee liability | $ 6.8
Revolving credit facility | 9.6
Amount of credit facility remaining borrowing capacity | 2.8
Surety Bonds |
Guarantee Obligations [Line Items] |
Guarantee liability | $ 173.4

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