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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