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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Apr. 30, 2014	Apr. 30, 2013
Accounts receivable - trade, allowance for doubtful accounts	$ 2,153us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	$ 1,672us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	$ 1,332us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Property, plant and equipment, accumulated depreciation and amortization	$ 736,839us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	$ 695,935us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	$ 645,567us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Class A Common Stock [Member]
Common stock, authorized shares	100,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	100,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	100,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Common stock, par value	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Common stock, issued shares	39,587,000us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	39,086,000us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	38,662,000us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Common stock, outstanding shares	39,587,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	39,086,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	38,662,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Class B Common Stock [Member]
Common stock, authorized shares	1,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	1,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	1,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Common stock, par value	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Common stock, votes (in votes per share)	10cwst_CommonStockVotesPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	10cwst_CommonStockVotesPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	10cwst_CommonStockVotesPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Common stock, issued shares	988,000us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	988,000us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	988,000us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Common stock, outstanding shares	988,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	988,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	988,000us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember

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