Commitments and Contingencies (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
---|---|---|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Mar. 31, 2021 |
|
Contracts with U.S. government agencies or other U.S. government contractors | Revenue Benchmark | Total U.S. government | |||||
Concentration Risk [Line Items] | |||||
Concentration risk, percentage | 98.00% | 97.00% | 98.00% | 97.00% | |
Unfavorable Regulatory Action | |||||
Loss Contingencies [Line Items] | |||||
Liability for reductions and/or penalties from U.S Government audits | $ 276.9 | $ 276.9 | $ 263.2 | ||
Financial Standby Letter of Credit | |||||
Concentration Risk [Line Items] | |||||
Guarantor obligations, carrying value | 8.2 | 8.2 | 9.8 | ||
Guarantor obligations, reduction to available borrowings | 0.9 | 0.9 | |||
Guarantor obligations, facility | 20.0 | ||||
Guarantor obligations, available amount | $ 12.7 | $ 12.7 | $ 11.1 |