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Subsidiary Guarantors - Schedule of Condensed Consolidating Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified | Jul. 31, 2014 | Apr. 30, 2014 | Jul. 31, 2013 | Apr. 30, 2013
--- | --- | --- | --- | ---
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | $ 2,595 | $ 2,464 | $ 2,919 | $ 1,755
Restricted cash | 76 | 76 |  |
Accounts receivable - trade, net | 59,212 | 52,603 |  |
Refundable income taxes | 462 | 465 |  |
Prepaid expenses | 8,359 | 7,176 |  |
Inventory | 4,191 | 3,905 |  |
Deferred income taxes | 2,331 | 2,502 |  |
Other current assets | 1,314 | 1,255 |  |
Current assets of discontinued operations | 365 | 359 |  |
Total current assets | 78,905 | 70,805 |  |
Property, plant and equipment, net | 403,306 | 403,424 |  |
Goodwill | 119,139 | 119,139 |  |
Intangible assets, net | 12,733 | 13,420 |  |
Restricted assets | 703 | 681 |  |
Cost method investments | 16,752 | 16,752 |  |
Investments in subsidiaries |  |  |  |
Other non-current assets | 23,687 | 24,205 |  |
Non-current assets of discontinued operations | 1,377 | 1,471 |  |
Total non-current assets | 577,697 | 579,092 |  |
Intercompany receivable |  |  |  |
Total assets | 656,602 | 649,897 | 674,744 |
CURRENT LIABILITIES: |  |  |  |
Current maturities of long-term debt and capital leases | 877 | 885 |  |
Accounts payable | 47,372 | 51,788 |  |
Accrued payroll and related expenses | 4,602 | 6,062 |  |
Accrued interest | 12,955 | 6,087 |  |
Current accrued capping, closure and post-closure costs | 4,669 | 7,312 |  |
Other accrued liabilities | 20,000 | 17,612 |  |
Total current liabilities | 90,475 | 89,746 |  |
Long-term debt and capital leases, less current maturities | 511,192 | 507,134 |  |
Accrued capping, closure and post-closure costs, less current portion | 38,846 | 37,342 |  |
Deferred income taxes | 6,956 | 6,954 |  |
Other long-term liabilities | 16,749 | 17,258 |  |
STOCKHOLDERS' (DEFICIT) EQUITY: |  |  |  |
Casella Waste Systems, Inc. stockholders (deficit)' equity | (7,777) | (8,407) |  |
Noncontrolling interests | 161 | (130) |  |
Total stockholders' (deficit) equity | (7,616) | (8,537) |  |
Total liabilities and stockholders' (deficit) equity | 656,602 | 649,897 |  |
Parent [Member] |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | 1,992 | 2,151 | 2,320 | 1,260
Restricted cash |  |  |  |
Accounts receivable - trade, net | 431 | 534 |  |
Refundable income taxes | 462 | 465 |  |
Prepaid expenses | 3,640 | 2,617 |  |
Inventory |  |  |  |
Deferred income taxes | 2,331 | 2,502 |  |
Other current assets | 296 | 312 |  |
Current assets of discontinued operations |  |  |  |
Total current assets | 9,152 | 8,581 |  |
Property, plant and equipment, net | 4,160 | 4,104 |  |
Goodwill |  |  |  |
Intangible assets, net | 136 | 159 |  |
Restricted assets |  |  |  |
Cost method investments | 16,752 | 16,752 |  |
Investments in subsidiaries | (25,882) | (36,006) |  |
Other non-current assets | 13,316 | 13,874 |  |
Non-current assets of discontinued operations |  |  |  |
Total non-current assets | 8,482 | (1,117) |  |
Intercompany receivable | 538,820 | 543,291 |  |
Total assets | 556,454 | 550,755 |  |
CURRENT LIABILITIES: |  |  |  |
Current maturities of long-term debt and capital leases | 86 | 84 |  |
Accounts payable | 17,345 | 22,678 |  |
Accrued payroll and related expenses | 701 | 1,212 |  |
Accrued interest | 12,950 | 6,084 |  |
Current accrued capping, closure and post-closure costs |  |  |  |
Other accrued liabilities | 7,674 | 7,289 |  |
Total current liabilities | 38,756 | 37,347 |  |
Long-term debt and capital leases, less current maturities | 509,018 | 504,836 |  |
Accrued capping, closure and post-closure costs, less current portion |  |  |  |
Deferred income taxes | 6,956 | 6,954 |  |
Other long-term liabilities | 9,501 | 10,025 |  |
STOCKHOLDERS' (DEFICIT) EQUITY: |  |  |  |
Casella Waste Systems, Inc. stockholders (deficit)' equity | (7,777) | (8,407) |  |
Noncontrolling interests |  |  |  |
Total stockholders' (deficit) equity | (7,777) | (8,407) |  |
Total liabilities and stockholders' (deficit) equity | 556,454 | 550,755 |  |
Guarantor [Member] |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | 261 | 271 | 299 | 253
Restricted cash | 76 | 76 |  |
Accounts receivable - trade, net | 58,769 | 51,983 |  |
Refundable income taxes |  |  |  |
Prepaid expenses | 4,710 | 4,557 |  |
Inventory | 4,151 | 3,852 |  |
Deferred income taxes |  |  |  |
Other current assets | 1,011 | 936 |  |
Current assets of discontinued operations | 365 | 359 |  |
Total current assets | 69,343 | 62,034 |  |
Property, plant and equipment, net | 398,497 | 398,670 |  |
Goodwill | 119,139 | 119,139 |  |
Intangible assets, net | 12,597 | 13,261 |  |
Restricted assets | 703 | 681 |  |
Cost method investments | 1,932 | 1,932 |  |
Investments in subsidiaries |  |  |  |
Other non-current assets | 10,371 | 10,331 |  |
Non-current assets of discontinued operations | 1,377 | 1,471 |  |
Total non-current assets | 544,616 | 545,485 |  |
Intercompany receivable | (501,875) | (506,348) |  |
Total assets | 112,084 | 101,171 |  |
CURRENT LIABILITIES: |  |  |  |
Current maturities of long-term debt and capital leases | 791 | 801 |  |
Accounts payable | 29,562 | 28,286 |  |
Accrued payroll and related expenses | 3,900 | 4,849 |  |
Accrued interest | 5 | 3 |  |
Current accrued capping, closure and post-closure costs | 4,666 | 7,309 |  |
Other accrued liabilities | 12,098 | 10,081 |  |
Total current liabilities | 51,022 | 51,329 |  |
Long-term debt and capital leases, less current maturities | 2,174 | 2,298 |  |
Accrued capping, closure and post-closure costs, less current portion | 38,809 | 37,306 |  |
Deferred income taxes |  |  |  |
Other long-term liabilities | 7,166 | 7,149 |  |
STOCKHOLDERS' (DEFICIT) EQUITY: |  |  |  |
Casella Waste Systems, Inc. stockholders (deficit)' equity | 12,913 | 3,089 |  |
Noncontrolling interests |  |  |  |
Total stockholders' (deficit) equity | 12,913 | 3,089 |  |
Total liabilities and stockholders' (deficit) equity | 112,084 | 101,171 |  |
Non-Guarantor [Member] |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | 342 | 42 | 300 | 242
Restricted cash |  |  |  |
Accounts receivable - trade, net | 12 | 86 |  |
Refundable income taxes |  |  |  |
Prepaid expenses | 9 | 2 |  |
Inventory | 40 | 53 |  |
Deferred income taxes |  |  |  |
Other current assets | 7 | 7 |  |
Current assets of discontinued operations |  |  |  |
Total current assets | 410 | 190 |  |
Property, plant and equipment, net | 649 | 650 |  |
Goodwill |  |  |  |
Intangible assets, net |  |  |  |
Restricted assets |  |  |  |
Cost method investments |  |  |  |
Investments in subsidiaries |  |  |  |
Other non-current assets |  |  |  |
Non-current assets of discontinued operations |  |  |  |
Total non-current assets | 649 | 650 |  |
Intercompany receivable | (38,877) | (38,875) |  |
Total assets | (37,818) | (38,035) |  |
CURRENT LIABILITIES: |  |  |  |
Current maturities of long-term debt and capital leases |  |  |  |
Accounts payable | 465 | 824 |  |
Accrued payroll and related expenses | 1 | 1 |  |
Accrued interest |  |  |  |
Current accrued capping, closure and post-closure costs | 3 | 3 |  |
Other accrued liabilities | 228 | 242 |  |
Total current liabilities | 697 | 1,070 |  |
Long-term debt and capital leases, less current maturities |  |  |  |
Accrued capping, closure and post-closure costs, less current portion | 37 | 36 |  |
Deferred income taxes |  |  |  |
Other long-term liabilities | 82 | 84 |  |
STOCKHOLDERS' (DEFICIT) EQUITY: |  |  |  |
Casella Waste Systems, Inc. stockholders (deficit)' equity | (38,795) | (39,095) |  |
Noncontrolling interests | 161 | (130) |  |
Total stockholders' (deficit) equity | (38,634) | (39,225) |  |
Total liabilities and stockholders' (deficit) equity | (37,818) | (38,035) |  |
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 |  |  |  |
Cost method investments | (1,932) | (1,932) |  |
Investments in subsidiaries | 25,882 | 36,006 |  |
Other non-current assets |  |  |  |
Non-current assets of discontinued operations |  |  |  |
Total non-current assets | 23,950 | 34,074 |  |
Intercompany receivable | 1,932 | 1,932 |  |
Total assets | 25,882 | 36,006 |  |
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 |  |  |  |
STOCKHOLDERS' (DEFICIT) EQUITY: |  |  |  |
Casella Waste Systems, Inc. stockholders (deficit)' equity | 25,882 | 36,006 |  |
Noncontrolling interests |  |  |  |
Total stockholders' (deficit) equity | 25,882 | 36,006 |  |
Total liabilities and stockholders' (deficit) equity | $ 25,882 | $ 36,006 |  |

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