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Commitments and Contingencies (Details)
Apr. 30, 2015
gal
Oct. 31, 2014
T
Supply Commitment [Line Items]    
Purchase Commitment, Remaining Minimum Amount Committed, Volume 889,000highwater_PurchaseCommitmentRemainingMinimumAmountCommittedVolume  
Distillers Grain [Member]    
Supply Commitment [Line Items]    
Supply Commitment, Remaining Minimum Amount Committed, Mass   31,000highwater_SupplyCommitmentRemainingMinimumAmountCommittedMass
/ us-gaap_SupplyCommitmentAxis
= highwater_DistillersGrainMember
Natural Gas [Member]    
Supply Commitment [Line Items]    
Purchase Commitment forward fixed contracts, energy 1,278,600highwater_PurchaseCommitmentforwardfixedcontractsenergy
/ us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis
= us-gaap_NaturalGasReservesMember