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Subsidiary Guarantors - Schedule of Condensed Consolidating Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011 | Apr. 30, 2010
--- | --- | --- | --- | ---
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | $ 1,755 | $ 4,534 | $ 1,817 | $ 2,035
Accounts receivable - trade, net of allowance for doubtful accounts | 48,689 | 47,472 |  |
Refundable income taxes | 128 | 1,281 |  |
Deferred income taxes | 238 | 3,712 |  |
Other current assets | 10,182 | 10,265 |  |
Current assets held for sale | 61 | 92 |  |
Total current assets | 61,053 | 67,356 |  |
Property, plant and equipment, net of accumulated depreciation and amortization | 422,502 | 414,666 |  |
Goodwill | 115,928 | 101,706 | 101,204 |
Intangible assets, net | 11,674 | 2,970 |  |
Restricted assets | 545 | 424 |  |
Investments in unconsolidated entities | 20,252 | 22,781 |  |
Investments in subsidiaries |  |  |  |
Other non-current assets | 27,673 | 21,789 |  |
Non-current assets held for sale |  | 2,051 |  |
Total non-current assets | 598,574 | 566,387 |  |
Intercompany receivable |  |  |  |
Total assets | 659,627 | 633,743 | 690,581 |
CURRENT LIABILITIES: |  |  |  |
Current maturities of long-term debt and capital leases | 857 | 1,228 |  |
Current maturities of financing lease obligations | 361 | 338 |  |
Accounts payable | 51,974 | 46,709 |  |
Accrued interest | 6,074 | 9,803 |  |
Current accrued capping, closure and post-closure costs | 3,835 | 4,907 |  |
Other current liabilities | 24,997 | 18,261 |  |
Total current liabilities | 88,098 | 81,246 |  |
Long-term debt and capital leases, less current maturities | 493,531 | 473,381 |  |
Financing lease obligations, less current maturities | 1,456 | 1,818 |  |
Accrued capping, closure and post-closure costs, less current portion | 39,335 | 34,722 |  |
Deferred income taxes | 3,306 | 5,336 |  |
Other long-term liabilities | 18,450 | 19,009 |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Additional paid-in capital | 335,857 | 288,348 |  |
Accumulated deficit | (324,377) | (270,235) |  |
Accumulated other comprehensive income (loss) | (592) | (1,952) |  |
Total Casella Waste Systems, Inc. stockholders' equity | 11,285 | 16,431 |  |
Noncontrolling interests | 4,166 | 1,800 |  |
Total stockholders' equity | 15,451 | 18,231 | 93,987 | 50,296
Total liabilities and stockholders' equity | 659,627 | 633,743 |  |
Class A Common Stock [Member] |  |  |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Common stock | 387 | 260 |  |
Total stockholders' equity | 387 | 260 | 256 | 249
Class B Common Stock [Member] |  |  |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Common stock | 10 | 10 |  |
Total stockholders' equity | 10 | 10 | 10 | 10
Parent [Member] |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | 1,260 | 3,799 | 1,531 | 1,234
Accounts receivable - trade, net of allowance for doubtful accounts | 571 | 652 |  |
Refundable income taxes | 128 | 1,281 |  |
Deferred income taxes | 238 | 3,712 |  |
Other current assets | 1,837 | 1,903 |  |
Current assets held for sale |  |  |  |
Total current assets | 4,034 | 11,347 |  |
Property, plant and equipment, net of accumulated depreciation and amortization | 2,771 | 3,486 |  |
Goodwill |  |  |  |
Intangible assets, net | 249 | 340 |  |
Restricted assets |  |  |  |
Investments in unconsolidated entities | 16,486 | 15,986 |  |
Investments in subsidiaries | (59,759) | (34,443) |  |
Other non-current assets | 15,921 | 15,778 |  |
Total non-current assets | (24,332) | 1,147 |  |
Intercompany receivable | 580,328 | 532,950 |  |
Total assets | 560,030 | 545,444 |  |
CURRENT LIABILITIES: |  |  |  |
Current maturities of long-term debt and capital leases |  | 142 |  |
Current maturities of financing lease obligations |  |  |  |
Accounts payable | 23,492 | 21,952 |  |
Accrued interest | 6,071 | 9,800 |  |
Current accrued capping, closure and post-closure costs |  |  |  |
Other current liabilities | 10,539 | 13,938 |  |
Total current liabilities | 40,102 | 45,832 |  |
Long-term debt and capital leases, less current maturities | 492,965 | 472,028 |  |
Financing lease obligations, less current maturities |  |  |  |
Accrued capping, closure and post-closure costs, less current portion |  |  |  |
Deferred income taxes | 3,306 | 5,336 |  |
Other long-term liabilities | 12,372 | 5,817 |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Additional paid-in capital | 335,857 | 288,348 |  |
Accumulated deficit | (324,377) | (270,235) |  |
Accumulated other comprehensive income (loss) | (592) | (1,952) |  |
Total Casella Waste Systems, Inc. stockholders' equity | 11,285 | 16,431 |  |
Noncontrolling interests |  |  |  |
Total stockholders' equity | 11,285 | 16,431 |  |
Total liabilities and stockholders' equity | 560,030 | 545,444 |  |
Parent [Member] | Class A Common Stock [Member] |  |  |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Common stock | 387 | 260 |  |
Parent [Member] | Class B Common Stock [Member] |  |  |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Common stock | 10 | 10 |  |
Guarantors [Member] |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | 253 | 368 | 286 | 801
Accounts receivable - trade, net of allowance for doubtful accounts | 47,644 | 46,820 |  |
Refundable income taxes |  |  |  |
Deferred income taxes |  |  |  |
Other current assets | 8,284 | 8,362 |  |
Current assets held for sale | 61 | 92 |  |
Total current assets | 56,242 | 55,642 |  |
Property, plant and equipment, net of accumulated depreciation and amortization | 411,284 | 407,332 |  |
Goodwill | 115,928 | 101,706 |  |
Intangible assets, net | 11,425 | 2,630 |  |
Restricted assets | 545 | 424 |  |
Investments in unconsolidated entities | 2,189 | 2,225 |  |
Investments in subsidiaries |  |  |  |
Other non-current assets | 11,752 | 6,011 |  |
Non-current assets held for sale |  | 2,051 |  |
Total non-current assets | 553,123 | 522,379 |  |
Intercompany receivable | (539,752) | (494,819) |  |
Total assets | 69,613 | 83,202 |  |
CURRENT LIABILITIES: |  |  |  |
Current maturities of long-term debt and capital leases | 857 | 1,086 |  |
Current maturities of financing lease obligations | 361 | 338 |  |
Accounts payable | 27,847 | 24,757 |  |
Accrued interest | 3 | 3 |  |
Current accrued capping, closure and post-closure costs | 3,832 | 4,907 |  |
Other current liabilities | 14,341 | 3,780 |  |
Total current liabilities | 47,241 | 34,871 |  |
Long-term debt and capital leases, less current maturities | 566 | 1,353 |  |
Financing lease obligations, less current maturities | 1,456 | 1,818 |  |
Accrued capping, closure and post-closure costs, less current portion | 39,298 | 34,681 |  |
Deferred income taxes |  |  |  |
Other long-term liabilities | 6,078 | 13,192 |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Additional paid-in capital | 43,897 | 46,279 |  |
Accumulated deficit | (69,051) | (49,097) |  |
Accumulated other comprehensive income (loss) | 28 | 5 |  |
Total Casella Waste Systems, Inc. stockholders' equity | (25,026) | (2,713) |  |
Noncontrolling interests |  |  |  |
Total stockholders' equity | (25,026) | (2,713) |  |
Total liabilities and stockholders' equity | 69,613 | 83,202 |  |
Guarantors [Member] | Class A Common Stock [Member] |  |  |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Common stock | 100 | 100 |  |
Guarantors [Member] | Class B Common Stock [Member] |  |  |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Common stock |  |  |  |
Non-Guarantors [Member] |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | 242 | 367 |  |
Accounts receivable - trade, net of allowance for doubtful accounts | 474 |  |  |
Refundable income taxes |  |  |  |
Deferred income taxes |  |  |  |
Other current assets | 61 |  |  |
Current assets held for sale |  |  |  |
Total current assets | 777 | 367 |  |
Property, plant and equipment, net of accumulated depreciation and amortization | 8,447 | 3,848 |  |
Goodwill |  |  |  |
Intangible assets, net |  |  |  |
Restricted assets |  |  |  |
Investments in unconsolidated entities | 3,509 | 6,502 |  |
Investments in subsidiaries |  |  |  |
Other non-current assets |  |  |  |
Non-current assets held for sale |  |  |  |
Total non-current assets | 11,956 | 10,350 |  |
Intercompany receivable | (42,508) | (40,063) |  |
Total assets | (29,775) | (29,346) |  |
CURRENT LIABILITIES: |  |  |  |
Current maturities of long-term debt and capital leases |  |  |  |
Current maturities of financing lease obligations |  |  |  |
Accounts payable | 635 |  |  |
Accrued interest |  |  |  |
Current accrued capping, closure and post-closure costs | 3 |  |  |
Other current liabilities | 117 | 543 |  |
Total current liabilities | 755 | 543 |  |
Long-term debt and capital leases, less current maturities |  |  |  |
Financing lease obligations, less current maturities |  |  |  |
Accrued capping, closure and post-closure costs, less current portion | 37 | 41 |  |
Deferred income taxes |  |  |  |
Other long-term liabilities |  |  |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Additional paid-in capital | 4,797 | 1,998 |  |
Accumulated deficit | (38,910) | (34,140) |  |
Accumulated other comprehensive income (loss) | (620) | 412 |  |
Total Casella Waste Systems, Inc. stockholders' equity | (34,733) | (31,730) |  |
Noncontrolling interests | 4,166 | 1,800 |  |
Total stockholders' equity | (30,567) | (29,930) |  |
Total liabilities and stockholders' equity | (29,775) | (29,346) |  |
Non-Guarantors [Member] | Class A Common Stock [Member] |  |  |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Common stock |  |  |  |
Non-Guarantors [Member] | Class B Common Stock [Member] |  |  |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Common stock |  |  |  |
Elimination [Member] |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents |  |  |  |
Accounts receivable - trade, net of allowance for doubtful accounts |  |  |  |
Refundable income taxes |  |  |  |
Deferred income taxes |  |  |  |
Other current assets |  |  |  |
Current assets held for sale |  |  |  |
Total current assets |  |  |  |
Property, plant and equipment, net of accumulated depreciation and amortization |  |  |  |
Goodwill |  |  |  |
Intangible assets, net |  |  |  |
Restricted assets |  |  |  |
Investments in unconsolidated entities | (1,932) | (1,932) |  |
Investments in subsidiaries | 59,759 | 34,443 |  |
Other non-current assets |  |  |  |
Non-current assets held for sale |  |  |  |
Total non-current assets | 57,827 | 32,511 |  |
Intercompany receivable | 1,932 | 1,932 |  |
Total assets | 59,759 | 34,443 |  |
CURRENT LIABILITIES: |  |  |  |
Current maturities of long-term debt and capital leases |  |  |  |
Current maturities of financing lease obligations |  |  |  |
Accounts payable |  |  |  |
Accrued interest |  |  |  |
Current accrued capping, closure and post-closure costs |  |  |  |
Other current liabilities |  |  |  |
Total current liabilities |  |  |  |
Long-term debt and capital leases, less current maturities |  |  |  |
Financing lease obligations, less current maturities |  |  |  |
Accrued capping, closure and post-closure costs, less current portion |  |  |  |
Deferred income taxes |  |  |  |
Other long-term liabilities |  |  |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Additional paid-in capital | (48,694) | (48,277) |  |
Accumulated deficit | 107,961 | 83,237 |  |
Accumulated other comprehensive income (loss) | 592 | (417) |  |
Total Casella Waste Systems, Inc. stockholders' equity | 59,759 | 34,443 |  |
Noncontrolling interests |  |  |  |
Total stockholders' equity | 59,759 | 34,443 |  |
Total liabilities and stockholders' equity | 59,759 | 34,443 |  |
Elimination [Member] | Class A Common Stock [Member] |  |  |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Common stock | (100) | (100) |  |
Elimination [Member] | Class B Common Stock [Member] |  |  |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Common stock |  |  |  |

X
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