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Commitments and Contingencies - Narrative (Details) |  |  |  | 1 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 20, 2018 USD ($) | Nov. 03, 2017 USD ($) plaintiff | Feb. 07, 2017 plaintiff | Jan. 31, 2019 USD ($) | Jan. 31, 2018 USD ($) | Apr. 30, 2019 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Standby letters of credit |  |  |  |  |  | $ 152,400,000
Surety bonds |  |  |  |  |  | $ 556,300,000
Subsidiary ownership interest (in percent) |  |  |  |  |  | 33.00%
Loss contingency amount accrued for probable losses |  |  |  |  |  | $ 11,700,000
Energy Savings Contracts |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Guarantee obligation |  |  |  |  |  | 175,300,000
Performance Guarantee | Joint Venture |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Total guarantees |  |  |  |  |  | 35,000,000
Minimum |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Amount of reasonably possible loss |  |  |  |  |  | 0
Maximum |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Amount of reasonably possible loss |  |  |  |  |  | 7,000,000
Settled Litigation | Hussein |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss contingency amount accrued for probable losses |  |  |  |  |  | 1,200,000
Settlement amount | $ 2,100,000 |  |  |  |  |
Settled Litigation | Isse |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of plaintiffs | plaintiff |  | 220 | 60 |  |  |
Payments for legal settlements |  |  |  |  | $ 4,500,000 |
Settled Litigation | Hussein And Isse |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Settlement amount |  | $ 8,300,000 |  |  |  |
Settled Litigation | Hussein, Opt-Out |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Settlement amount |  |  |  | $ 1,200,000 |  |
Pending Litigation | Castro |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss contingency amount accrued for probable losses |  |  |  |  |  | $ 5,400,000

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