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Subsidiary Guarantors (Schedule of Condensed Consolidating Balance Sheet) (Detail) (USD $) In Thousands, unless otherwise specified | Jan. 31, 2013 | Apr. 30, 2012 | Jan. 31, 2012 | Apr. 30, 2011
--- | --- | --- | --- | ---
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | $ 1,112 | $ 4,534 | $ 1,131 | $ 1,817
Accounts receivable - trade, net of allowance for doubtful accounts | 50,425 | 47,472 |  |
Refundable income taxes | 1,209 | 1,281 |  |
Prepaid expenses | 8,961 | 6,077 |  |
Deferred income taxes | 3,253 | 3,712 |  |
Other current assets | 854 | 609 |  |
Total current assets | 69,813 | 67,356 |  |
Property, plant and equipment, net of accumulated depreciation and amortization | 428,452 | 416,717 |  |
Goodwill | 116,281 | 101,706 |  |
Intangible assets | 11,979 | 2,970 |  |
Restricted assets | 523 | 424 |  |
Notes receivable - related party/employee | 516 | 722 |  |
Investments in unconsolidated entities | 19,431 | 22,781 |  |
Other non-current assets | 26,158 | 21,067 |  |
Total non-current assets | 603,340 | 566,387 |  |
Total assets | 673,153 | 633,743 | 674,369 |
CURRENT LIABILITIES: |  |  |  |
Current maturities of long-term debt and capital leases | 992 | 1,228 |  |
Current maturities of financing lease obligations | 355 | 338 |  |
Accounts payable | 47,695 | 46,709 |  |
Accrued interest | 12,702 | 9,803 |  |
Current accrued capping, closure and post-closure costs | 4,903 | 4,907 |  |
Other current liabilities | 31,944 | 35,153 |  |
Total current liabilities | 98,591 | 88,335 |  |
Long-term debt and capital leases, less current maturities | 490,686 | 473,381 |  |
Financing lease obligations, less current maturities | 1,549 | 1,818 |  |
Accrued capping, closure and post-closure costs, less current portion | 37,681 | 34,722 |  |
Other long-term liabilities | 11,753 | 11,920 |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Additional paid-in capital | 335,451 | 288,348 |  |
Accumulated deficit | (310,982) | (270,235) |  |
Accumulated other comprehensive income (loss) | (619) | (1,952) |  |
Total Casella Waste Systems, Inc. stockholders' equity | 24,247 | 16,431 |  |
Noncontrolling interest | 2,688 | 1,800 |  |
Total stockholders' equity | 26,935 | 18,231 |  |
Total liabilities and stockholders' equity | 673,153 | 633,743 |  |
Class A Common Stock [Member] |  |  |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Common stock | 387 | 260 |  |
Total stockholders' equity | 387 | 260 |  |
Class B Common Stock [Member] |  |  |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Common stock | 10 | 10 |  |
Total stockholders' equity | 10 | 10 |  |
Parent [Member] |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | 820 | 3,799 | 942 | 1,531
Accounts receivable - trade, net of allowance for doubtful accounts | 229 | 652 |  |
Refundable income taxes |  | 1,281 |  |
Prepaid expenses | 3,308 |  |  |
Deferred income taxes |  | 3,712 |  |
Other current assets | 4,831 | 1,903 |  |
Total current assets | 9,188 | 11,347 |  |
Property, plant and equipment, net of accumulated depreciation and amortization | 3,024 | 3,486 |  |
Goodwill |  |  |  |
Intangible assets | 272 | 340 |  |
Notes receivable - related party/employee | 516 | 722 |  |
Investments in unconsolidated entities | 16,486 | 15,986 |  |
Investments in subsidiaries | (47,081) | (34,443) |  |
Other non-current assets | 15,010 | 15,056 |  |
Total non-current assets | (11,773) | 1,147 |  |
Intercompany receivable | 577,898 | 532,950 |  |
Total assets | 575,313 | 545,444 |  |
CURRENT LIABILITIES: |  |  |  |
Current maturities of long-term debt and capital leases | 37 | 142 |  |
Current maturities of financing lease obligations |  |  |  |
Accounts payable | 22,111 | 21,952 |  |
Accrued interest | 12,691 |  |  |
Current accrued capping, closure and post-closure costs |  |  |  |
Other current liabilities | 14,790 | 23,738 |  |
Total current liabilities | 49,629 | 45,832 |  |
Long-term debt and capital leases, less current maturities | 489,908 | 472,028 |  |
Financing lease obligations, less current maturities |  |  |  |
Accrued capping, closure and post-closure costs, less current portion |  |  |  |
Other long-term liabilities | 11,529 | 11,153 |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Additional paid-in capital | 335,451 | 288,348 |  |
Accumulated deficit | (310,982) | (270,235) |  |
Accumulated other comprehensive income (loss) | (619) | (1,952) |  |
Total Casella Waste Systems, Inc. stockholders' equity | 24,247 | 16,431 |  |
Noncontrolling interest |  |  |  |
Total stockholders' equity | 24,247 | 16,431 |  |
Total liabilities and stockholders' equity | 575,313 | 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 | 227 | 368 | 138 | 286
Accounts receivable - trade, net of allowance for doubtful accounts | 49,756 | 46,820 |  |
Prepaid expenses | 5,653 |  |  |
Other current assets | 4,419 | 8,454 |  |
Total current assets | 60,055 | 55,642 |  |
Property, plant and equipment, net of accumulated depreciation and amortization | 416,934 | 409,383 |  |
Goodwill | 116,281 | 101,706 |  |
Intangible assets | 11,707 | 2,630 |  |
Restricted assets |  | 424 |  |
Investments in unconsolidated entities | 2,239 | 2,225 |  |
Other non-current assets | 11,671 | 6,011 |  |
Total non-current assets | 558,832 | 522,379 |  |
Intercompany receivable | (539,265) | (494,819) |  |
Total assets | 79,622 | 83,202 |  |
CURRENT LIABILITIES: |  |  |  |
Current maturities of long-term debt and capital leases | 955 | 1,086 |  |
Current maturities of financing lease obligations | 355 | 338 |  |
Accounts payable | 24,754 | 24,757 |  |
Accrued interest | 11 |  |  |
Current accrued capping, closure and post-closure costs | 4,903 | 4,907 |  |
Other current liabilities | 16,849 | 10,872 |  |
Total current liabilities | 47,827 | 41,960 |  |
Long-term debt and capital leases, less current maturities | 778 | 1,353 |  |
Financing lease obligations, less current maturities | 1,549 | 1,818 |  |
Accrued capping, closure and post-closure costs, less current portion | 37,637 | 34,681 |  |
Other long-term liabilities | 6,182 | 6,103 |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Additional paid-in capital | 45,391 | 46,279 |  |
Accumulated deficit | (59,851) | (49,097) |  |
Accumulated other comprehensive income (loss) | 9 | 5 |  |
Total Casella Waste Systems, Inc. stockholders' equity | (14,351) | (2,713) |  |
Total stockholders' equity | (14,351) | (2,713) |  |
Total liabilities and stockholders' equity | 79,622 | 83,202 |  |
Guarantors [Member] | Class A Common Stock [Member] |  |  |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Common stock | 100 | 100 |  |
Non-Guarantors [Member] |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | 65 | 367 | 51 |
Accounts receivable - trade, net of allowance for doubtful accounts | 440 |  |  |
Other current assets | 65 |  |  |
Total current assets | 570 | 367 |  |
Property, plant and equipment, net of accumulated depreciation and amortization | 8,494 | 3,848 |  |
Investments in unconsolidated entities | 2,638 | 6,502 |  |
Total non-current assets | 11,132 | 10,350 |  |
Intercompany receivable | (40,565) | (40,063) |  |
Total assets | (28,863) | (29,346) |  |
CURRENT LIABILITIES: |  |  |  |
Current maturities of long-term debt and capital leases |  |  |  |
Accounts payable | 830 |  |  |
Other current liabilities | 305 | 543 |  |
Total current liabilities | 1,135 | 543 |  |
Accrued capping, closure and post-closure costs, less current portion | 44 | 41 |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Additional paid-in capital | 5,608 | 1,998 |  |
Accumulated deficit | (37,710) | (34,140) |  |
Accumulated other comprehensive income (loss) | (628) | 412 |  |
Total Casella Waste Systems, Inc. stockholders' equity | (32,730) | (31,730) |  |
Noncontrolling interest | 2,688 | 1,800 |  |
Total stockholders' equity | (30,042) | (29,930) |  |
Total liabilities and stockholders' equity | (28,863) | (29,346) |  |
Elimination [Member] |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents |  |  |  |
Investments in unconsolidated entities | (1,932) | (1,932) |  |
Investments in subsidiaries | 47,081 | 34,443 |  |
Total non-current assets | 45,149 | 32,511 |  |
Intercompany receivable | 1,932 | 1,932 |  |
Total assets | 47,081 | 34,443 |  |
CURRENT LIABILITIES: |  |  |  |
Current maturities of long-term debt and capital leases |  |  |  |
Other current liabilities |  |  |  |
Total current liabilities |  |  |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Additional paid-in capital | (50,999) | (48,277) |  |
Accumulated deficit | 97,561 | 83,237 |  |
Accumulated other comprehensive income (loss) | 619 | (417) |  |
Total Casella Waste Systems, Inc. stockholders' equity | 47,081 | 34,443 |  |
Total stockholders' equity | 47,081 | 34,443 |  |
Total liabilities and stockholders' equity | 47,081 | 34,443 |  |
Elimination [Member] | Class A Common Stock [Member] |  |  |  |
Casella Waste Systems, Inc. stockholders' equity: |  |  |  |
Common stock | $ (100) | $ (100) |  |

X
- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid within one year (or one operating cycle, if longer) of the balance sheet date that relates for our financing lease obligations, which qualify for treatment as capital leases, but are presented separately from LTD and capital leases. + References No definition available. + Details
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