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Segment Information Geographic Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2021 | Apr. 30, 2021 | Jan. 31, 2021 | Oct. 31, 2020 | Jul. 31, 2020 | Apr. 30, 2020 | Jan. 31, 2020 | Oct. 31, 2019 | Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 204,202 | $ 889,078 | $ 684,644 | $ 131,786 | $ 77,209 | $ 694,087 | $ 924,638 | $ 267,770 | $ 1,909,710 | $ 1,963,704 | $ 2,271,575
Property, Plant and Equipment, Net | 2,067,876 |  |  |  | 2,192,679 |  |  |  | 2,067,876 | 2,192,679 |
Canadian [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 223,300 | 308,100
Property, Plant and Equipment, Net | 288,400 |  |  |  | 291,700 |  |  |  | 288,400 | 291,700 |
Geographic Distribution, Foreign [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 192,440 | 307,743 | 406,513
Property, Plant and Equipment, Net | 421,779 |  |  |  | 432,987 |  |  |  | 421,779 | 432,987 |
Geographic Distribution, Domestic [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,717,270 | 1,655,961 | $ 1,865,062
Property, Plant and Equipment, Net | $ 1,646,097 |  |  |  | $ 1,759,692 |  |  |  | $ 1,646,097 | $ 1,759,692 |

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