Energy Services Accounts Receivable Securitization Facility - Narrative (Details) - Maximum - USD ($)	6 Months Ended	18 Months Ended
Apr. 30, 2018	Oct. 31, 2019
Accounts, Notes, Loans and Financing Receivable
Receivables facility	$ 150,000,000
Forecast
Accounts, Notes, Loans and Financing Receivable
Receivables facility		$ 75,000,000

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