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Commitments and Contingent Liabilities (Details) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 16, 2013 state relator defendant | Jan. 31, 2017 USD ($) | Mar. 31, 2017 USD ($) site | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |
Payments for legal settlements |  |  | $ 150.0 | $ 0.0 | $ 0.0
Anti-Kickback Claim |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of relators | relator | 2 |  |  |  |
Number of states filed on behalf of | state | 21 |  |  |  |
Number of additional defendants | defendant | 5 |  |  |  |
Environmental Litigation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of sites | site |  |  | 5 |  |
Remediation costs |  |  | $ 10.4 |  |
Hazardous substance sites, number | site |  |  | 13 |  |
Estimated environmental assessment and cleanup costs |  |  | $ 1,380.0 |  |
Estimated loss |  |  | $ 24.3 |  |
Environmental Litigation | Minimum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Time frame of disbursements |  |  | Apr. 01, 2017 |  |
Environmental Litigation | Maximum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Time frame of disbursements |  |  | Mar. 31, 2047 |  |
Drug Enforcement Administration, Department of Justice and U.S. Attorneys' Investigative Claims |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Litigation pre-tax charge |  |  |  |  | $ 150.0
Payments for legal settlements |  | $ 150.0 |  |  |

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