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Net Loss Per Common Unitholders' Interest (Details) - USD ($)
3 Months Ended 12 Months Ended 36 Months Ended
Jul. 31, 2019
Apr. 30, 2019
Jan. 31, 2019
Oct. 31, 2018
Jul. 31, 2018
Apr. 30, 2018
Jan. 31, 2018
Oct. 31, 2017
Jul. 31, 2017
Apr. 30, 2017
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2019
Earnings Distribution Allocation [Line Items]                                
Value of dilutive securities                               $ 0
Common unitholders' interest in net earnings (loss) $ (70,327,000) $ 20,256,000 $ 42,911,000 $ (56,445,000) $ (213,527,000) $ 10,752,000 $ (1,824,000) $ (47,436,000) $ (55,210,000) $ 6,470,000 $ 37,717,000 $ (42,462,000) $ (63,605,000) $ (252,035,000) $ (53,665,000)  
Weighted average common units outstanding, basic and diluted                         97,152,700 97,152,700 97,229,500  
Basic and diluted net loss per common unit $ (0.72) $ 0.21 $ 0.44 $ (0.58) $ (2.20) $ 0.11 $ (0.02) $ (0.49) $ (0.57) $ 0.07 $ 0.39 $ (0.44) $ (0.65) $ (2.59) $ (0.55)  
$0.56 to $0.63 | Common Unitholders [Member]                                
Earnings Distribution Allocation [Line Items]                                
Ratio of total distributions payable                         51.50%      
$0.56 to $0.63 | General Partner [Member]                                
Earnings Distribution Allocation [Line Items]                                
Ratio of total distributions payable                         48.50%      
$0.64 to $0.82 | Common Unitholders [Member]                                
Earnings Distribution Allocation [Line Items]                                
Ratio of total distributions payable                         76.80%      
$0.64 to $0.82 | General Partner [Member]                                
Earnings Distribution Allocation [Line Items]                                
Ratio of total distributions payable                         23.20%      
$0.83 and above | Common Unitholders [Member]                                
Earnings Distribution Allocation [Line Items]                                
Ratio of total distributions payable                         86.90%      
$0.83 and above | General Partner [Member]                                
Earnings Distribution Allocation [Line Items]                                
Ratio of total distributions payable                         13.10%      
Minimum [Member] | $0.56 to $0.63                                
Earnings Distribution Allocation [Line Items]                                
Earnings Per Share, Basic, Distributed                         $ 0.83      
Minimum [Member] | $0.64 to $0.82                                
Earnings Distribution Allocation [Line Items]                                
Earnings Per Share, Basic, Distributed                         0.64      
Minimum [Member] | $0.83 and above                                
Earnings Distribution Allocation [Line Items]                                
Earnings Per Share, Basic, Distributed                         0.56      
Maximum [Member] | $0.64 to $0.82                                
Earnings Distribution Allocation [Line Items]                                
Earnings Per Share, Basic, Distributed                         0.82      
Maximum [Member] | $0.83 and above                                
Earnings Distribution Allocation [Line Items]                                
Earnings Per Share, Basic, Distributed                         $ 0.63