CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Oct. 31, 2011	Oct. 31, 2010
Cash Flows from Operating Activities:
Net loss attributable to common stockholders	$ (3,826)	$ (4,056)
Loss from discontinued operations, net		1,692
(Gain) loss on disposal of discontinued operations, net	(725)	615
Adjustments to reconcile net loss to net cash provided by operating activities -
Gain on sale of assets		(3,502)
Gain on sale of property and equipment	(754)	(302)
Depreciation and amortization	29,567	31,203
Depletion of landfill operating lease obligations	4,514	4,299
Interest accretion on landfill and environmental remediation liabilities	1,740	1,656
Development project charge	131
Amortization of premium on senior subordinated notes		(386)
Amortization of discount on term loan and second lien notes	467	450
Loss from equity method investments	3,781	2,638
Stock-based compensation	1,366	1,347
Excess tax benefit on the vesting of share based awards	(219)	(117)
Deferred income taxes	1,008	1,185
Changes in assets and liabilities, net of effects of acquisitions and divestitures -
Accounts receivable	(2,070)	(3,515)
Accounts payable	9,259	3,222
Prepaid expenses, inventories and other assets	(482)	442
Accrued expenses and other liabilities	(2,279)	(2,715)
Total adjustments to reconcile net loss to net cash provided by operating activities	46,029	35,905
Net Cash Provided By Operating Activities	41,478	34,156
Cash Flows from Investing Activities:
Acquisitions, net of cash acquired	(715)
Additions to property, plant and equipment - growth	(6,410)	(990)
Additions to property, plant and equipment - maintenance	(29,560)	(29,779)
Payments on landfill operating lease contracts	(3,314)	(2,250)
Proceeds from sale of assets		7,533
Proceeds from sale of property and equipment	1,170	555
Investments in unconsolidated entities	(935)
Net Cash Used In Investing Activities	(39,764)	(24,931)
Cash Flows from Financing Activities:
Proceeds from long-term borrowings	82,100	76,900
Principal payments on long-term debt	(82,146)	(83,966)
Payments of financing costs	(184)	(357)
Proceeds from exercise of share based awards	176	160
Excess tax benefit on the vesting of share based awards	219	117
Net Cash Provided By (Used In) Financing Activities	165	(7,146)
Discontinued Operations:
Net cash provided by operating activities		1,356
Net cash provided by (used in) investing activities	725	(1,156)
Net cash used in financing activities		(270)
Net Cash Provided By (Used In) Discontinued Operations	725	(70)
Net increase in cash and cash equivalents	2,604	2,009
Cash and cash equivalents, beginning of period	1,817	2,035
Cash and cash equivalents, end of period	4,421	4,044
Cash paid during the period for -
Interest	20,531	21,344
Income taxes, net of refunds	5,281	117
Summary of entities acquired in purchase business combinations -
Fair value of assets acquired	744
Cash paid, net	715
Holdbacks to sellers	29
Equipment contributed by noncontrolling interest	$ 1,270