The intercompany receivable balance, which is eliminated during consolidation.

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The investment in subsidiaries balance, which is eliminated during consolidation.

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The amount of estimated costs accrued as of the balance sheet date to comply with regulatory requirements pertaining to the retirement of a waste management facility (such as a landfill or waste treatment facility). Represents the portion that will be paid within one year or the normal operating cycle, if longer.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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Amount classified as long lived assets attributable to disposal group held for sale or disposed of, expected to be disposed of after one year or the normal operating cycle, if longer.

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Subsidiary Guarantors - Schedule of Condensed Consolidating Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
CURRENT ASSETS:
Cash and cash equivalents	$ 2,205	$ 2,464	$ 1,755	$ 4,534	$ 1,817
Restricted cash	76	76	76
Accounts receivable-trade, net	55,750us-gaap_AccountsReceivableNetCurrent	52,603us-gaap_AccountsReceivableNetCurrent	48,689us-gaap_AccountsReceivableNetCurrent
Refundable income taxes	554us-gaap_IncomeTaxesReceivable	465us-gaap_IncomeTaxesReceivable	128us-gaap_IncomeTaxesReceivable
Prepaid expenses	8,763us-gaap_PrepaidExpenseCurrent	7,176us-gaap_PrepaidExpenseCurrent	5,711us-gaap_PrepaidExpenseCurrent
Inventory	4,374us-gaap_InventoryGross	3,905us-gaap_InventoryGross	3,494us-gaap_InventoryGross
Deferred income taxes	2,095us-gaap_DeferredTaxAssetsNetCurrent	2,502us-gaap_DeferredTaxAssetsNetCurrent	3,730us-gaap_DeferredTaxAssetsNetCurrent
Other current assets	4,852us-gaap_OtherAssetsCurrent	1,255us-gaap_OtherAssetsCurrent	901us-gaap_OtherAssetsCurrent
Current assets of discontinued operations		359	61
Total current assets	78,669us-gaap_AssetsCurrent	70,805us-gaap_AssetsCurrent	64,545us-gaap_AssetsCurrent
Property, plant and equipment, net	414,542us-gaap_PropertyPlantAndEquipmentNet	403,424us-gaap_PropertyPlantAndEquipmentNet	422,502us-gaap_PropertyPlantAndEquipmentNet
Goodwill	119,170us-gaap_Goodwill	119,139us-gaap_Goodwill	115,928us-gaap_Goodwill	101,706us-gaap_Goodwill
Intangible assets, net	11,808us-gaap_FiniteLivedIntangibleAssetsNet	13,420us-gaap_FiniteLivedIntangibleAssetsNet	11,674us-gaap_FiniteLivedIntangibleAssetsNet
Restricted assets	6,632	681	545
Notes receivable-related party/employee		149	147
Investments in unconsolidated entities	14,432	16,752	20,252
Investments in subsidiaries
Other non-current assets	24,542us-gaap_OtherAssetsNoncurrent	24,205us-gaap_OtherAssetsNoncurrent	27,526us-gaap_OtherAssetsNoncurrent
Non-current assets of discontinued operations		1,471
Total non-current assets	591,126us-gaap_AssetsNoncurrent	579,092us-gaap_AssetsNoncurrent	598,574us-gaap_AssetsNoncurrent
Intercompany receivable
Total assets	669,795us-gaap_Assets	649,897us-gaap_Assets	663,119us-gaap_Assets	633,743us-gaap_Assets
CURRENT LIABILITIES:
Current maturities of long-term debt and capital leases	1,656	885	1,218
Accounts payable	48,518us-gaap_AccountsPayableCurrent	51,788us-gaap_AccountsPayableCurrent	51,974us-gaap_AccountsPayableCurrent
Accrued payroll and related expenses	6,289	6,062	3,983
Accrued interest	11,094us-gaap_InterestPayableCurrent	6,087us-gaap_InterestPayableCurrent	6,074us-gaap_InterestPayableCurrent
Current accrued capping, closure and post-closure costs	2,208	7,312	3,835
Other accrued liabilities	16,667us-gaap_OtherAccruedLiabilitiesCurrent	17,612us-gaap_OtherAccruedLiabilitiesCurrent	21,014us-gaap_OtherAccruedLiabilitiesCurrent
Total current liabilities	86,432us-gaap_LiabilitiesCurrent	89,746us-gaap_LiabilitiesCurrent	88,098us-gaap_LiabilitiesCurrent
Long-term debt and capital leases, less current maturities	534,055	507,134	494,987
Accrued capping, closure and post-closure costs, less current portion	37,621	37,342	39,335
Deferred income taxes	7,080	6,954	6,798
Other long-term liabilities	16,627us-gaap_OtherLiabilitiesNoncurrent	17,258us-gaap_OtherLiabilitiesNoncurrent	18,450us-gaap_OtherLiabilitiesNoncurrent
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' (DEFICIT) EQUITY:
Total Casella Waste Systems, Inc. stockholders' (deficit) equity	(12,253)us-gaap_StockholdersEquity	(8,407)us-gaap_StockholdersEquity	11,285us-gaap_StockholdersEquity
Noncontrolling interests	233us-gaap_MinorityInterest	(130)us-gaap_MinorityInterest	4,166us-gaap_MinorityInterest
Total stockholders' (deficit) equity	(12,020)	(8,537)	15,451	18,231	93,987
Total liabilities and stockholders' (deficit) equity	669,795	649,897	663,119
Parent [Member]
CURRENT ASSETS:
Cash and cash equivalents	1,596	2,151	1,260	3,799	1,531
Restricted cash
Accounts receivable-trade, net	597	534	571
Refundable income taxes	554	465	128
Prepaid expenses	3,622	2,617	1,471
Inventory
Deferred income taxes	2,095	2,502	3,730
Other current assets	296	312	366
Current assets of discontinued operations
Total current assets	8,760	8,581	7,526
Property, plant and equipment, net	5,049	4,104	2,771
Goodwill
Intangible assets, net	98	159	249
Restricted assets	5,819
Notes receivable-related party/employee			147
Investments in unconsolidated entities	14,432	16,752	16,486
Investments in subsidiaries	(9,888)	(36,006)	(59,759)
Other non-current assets	14,611	13,874	15,774
Non-current assets of discontinued operations
Total non-current assets	30,121	(1,117)	(24,332)
Intercompany receivable	537,228	543,291	580,328
Total assets	576,109	550,755	563,522
CURRENT LIABILITIES:
Current maturities of long-term debt and capital leases	89	84
Accounts payable	17,953	22,678	23,492
Accrued payroll and related expenses	1,536	1,212	538
Accrued interest	11,083	6,084	6,071
Current accrued capping, closure and post-closure costs
Other accrued liabilities	8,618	7,289	10,001
Total current liabilities	39,279	37,347	40,102
Long-term debt and capital leases, less current maturities	532,889	504,836	492,965
Accrued capping, closure and post-closure costs, less current portion
Deferred income taxes	7,080	6,954	6,798
Other long-term liabilities	9,114	10,025	12,372
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' (DEFICIT) EQUITY:
Total Casella Waste Systems, Inc. stockholders' (deficit) equity	(12,253)	(8,407)	11,285
Noncontrolling interests
Total stockholders' (deficit) equity	(12,253)	(8,407)	11,285
Total liabilities and stockholders' (deficit) equity	576,109	550,755	563,522
Guarantors [Member]
CURRENT ASSETS:
Cash and cash equivalents	253	271	253	368	286
Restricted cash	76	76	76
Accounts receivable-trade, net	55,053	51,983	47,644
Refundable income taxes
Prepaid expenses	5,136	4,557	4,240
Inventory	4,345	3,852	3,440
Deferred income taxes
Other current assets	4,549	936	528
Current assets of discontinued operations		359	61
Total current assets	69,412	62,034	56,242
Property, plant and equipment, net	408,843	398,670	411,284
Goodwill	119,170	119,139	115,928
Intangible assets, net	11,710	13,261	11,425
Restricted assets	813	681	545
Notes receivable-related party/employee
Investments in unconsolidated entities	1,932	1,932	2,189
Investments in subsidiaries
Other non-current assets	9,931	10,331	11,752
Non-current assets of discontinued operations		1,471
Total non-current assets	552,399	545,485	553,123
Intercompany receivable	(500,267)	(506,348)	(539,752)
Total assets	121,544	101,171	69,613
CURRENT LIABILITIES:
Current maturities of long-term debt and capital leases	1,567	801	1,218
Accounts payable	30,040	28,286	27,847
Accrued payroll and related expenses	4,751	4,849	3,445
Accrued interest	11	3	3
Current accrued capping, closure and post-closure costs	2,205	7,309	3,832
Other accrued liabilities	7,957	10,081	10,896
Total current liabilities	46,531	51,329	47,241
Long-term debt and capital leases, less current maturities	1,166	2,298	2,022
Accrued capping, closure and post-closure costs, less current portion	37,589	37,306	39,298
Deferred income taxes
Other long-term liabilities	7,433	7,149	6,078
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' (DEFICIT) EQUITY:
Total Casella Waste Systems, Inc. stockholders' (deficit) equity	28,825	3,089	(25,026)
Noncontrolling interests
Total stockholders' (deficit) equity	28,825	3,089	(25,026)
Total liabilities and stockholders' (deficit) equity	121,544	101,171	69,613
Non-Guarantors [Member]
CURRENT ASSETS:
Cash and cash equivalents	356	42	242	367
Restricted cash
Accounts receivable-trade, net	100	86	474
Refundable income taxes
Prepaid expenses	5	2
Inventory	29	53	54
Deferred income taxes
Other current assets	7	7	7
Current assets of discontinued operations
Total current assets	497	190	777
Property, plant and equipment, net	650	650	8,447
Goodwill
Intangible assets, net
Restricted assets
Notes receivable-related party/employee
Investments in unconsolidated entities			3,509
Investments in subsidiaries
Other non-current assets
Non-current assets of discontinued operations
Total non-current assets	650	650	11,956
Intercompany receivable	(38,893)	(38,875)	(42,508)
Total assets	(37,746)	(38,035)	(29,775)
CURRENT LIABILITIES:
Current maturities of long-term debt and capital leases
Accounts payable	525	824	635
Accrued payroll and related expenses	2	1
Accrued interest
Current accrued capping, closure and post-closure costs	3	3	3
Other accrued liabilities	92	242	117
Total current liabilities	622	1,070	755
Long-term debt and capital leases, less current maturities
Accrued capping, closure and post-closure costs, less current portion	32	36	37
Deferred income taxes
Other long-term liabilities	80	84
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' (DEFICIT) EQUITY:
Total Casella Waste Systems, Inc. stockholders' (deficit) equity	(38,713)	(39,095)	(34,733)
Noncontrolling interests	233	(130)	4,166
Total stockholders' (deficit) equity	(38,480)	(39,225)	(30,567)
Total liabilities and stockholders' (deficit) equity	(37,746)	(38,035)	(29,775)
Elimination [Member]
CURRENT ASSETS:
Cash and cash equivalents
Restricted cash
Accounts receivable-trade, net
Refundable income taxes
Prepaid expenses
Inventory
Deferred income taxes
Other current assets
Current assets of discontinued operations
Total current assets
Property, plant and equipment, net
Goodwill
Intangible assets, net
Restricted assets
Notes receivable-related party/employee
Investments in unconsolidated entities	(1,932)	(1,932)	(1,932)
Investments in subsidiaries	9,888	36,006	59,759
Other non-current assets
Non-current assets of discontinued operations
Total non-current assets	7,956	34,074	57,827
Intercompany receivable	1,932	1,932	1,932
Total assets	9,888	36,006	59,759
CURRENT LIABILITIES:
Current maturities of long-term debt and capital leases
Accounts payable
Accrued payroll and related expenses
Accrued interest
Current accrued capping, closure and post-closure costs
Other accrued liabilities
Total current liabilities
Long-term debt and capital leases, less current maturities
Accrued capping, closure and post-closure costs, less current portion
Deferred income taxes
Other long-term liabilities
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' (DEFICIT) EQUITY:
Total Casella Waste Systems, Inc. stockholders' (deficit) equity	9,888	36,006	59,759
Noncontrolling interests
Total stockholders' (deficit) equity	9,888	36,006	59,759
Total liabilities and stockholders' (deficit) equity	$ 9,888	$ 36,006	$ 59,759