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Subsequent Events (Details) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
Subsequent Events (Details) $ in Millions	May 04, 2020 USD ($) rig	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)
Subsequent Event [Line Items]
Early termination revenue \| $		$ 8.2	$ 1.2	$ 8.3	$ 8.3
Subsequent Event
Subsequent Event [Line Items]
Early termination revenue \| $	$ 27.0
Domestic Conventional Rigs Asset Group \| Subsequent Event
Subsequent Event [Line Items]
Number of rigs decommissioned \| rig	2
FlexRig3 Asset Group \| Subsequent Event
Subsequent Event [Line Items]
Number of rigs decommissioned \| rig	35