CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2012	Jan. 31, 2011
Revenues	$ 114,578	$ 111,627	$ 371,637	$ 356,515
Operating expenses:
Cost of operations	81,398	76,933	253,248	237,584
General and administration	13,933	14,832	46,202	46,446
Depreciation and amortization	14,827	13,573	44,394	44,776
Legal settlement			1,359
Development project charge			131
Gain on sale of assets				(3,502)
Total operating expenses	110,158	105,338	345,334	325,304
Operating income	4,420	6,289	26,303	31,211
Other expense/(income), net:
Interest income	(20)	(15)	(32)	(41)
Interest expense	11,528	11,663	33,897	35,073
Loss (income) from equity method investments	6,383	(102)	10,163	2,536
Impairment of equity method investment	10,680		10,680
Loss on debt modification		115		115
Other income	(117)	(78)	(549)	(490)
Other expense, net	28,454	11,583	54,159	37,193
Loss from continuing operations before income taxes and discontinued operations	(24,034)	(5,294)	(27,856)	(5,982)
Provision for income taxes	601	1,079	1,330	2,139
Loss from continuing operations before discontinued operations	(24,635)	(6,373)	(29,186)	(8,121)
Discontinued operations:
Income (loss) from discontinued operations (net of income tax benefit of $0, $7, $0, $7)		1,376		(316)
(Loss) gain on disposal of discontinued operations (net of income tax provision of $0, $0, $489 and $0)		(1,368)	725	(1,984)
Net loss attributable to common stockholders	$ (24,635)	$ (6,365)	$ (28,461)	$ (10,421)
Basic and diluted earnings per share:
Loss from continuing operations before discontinued operations (in dollars per share)	$ (0.92)	$ (0.24)	$ (1.09)	$ (0.31)
Income (loss) from discontinued operations, net (in dollars per share)		$ 0.05		$ (0.01)
(Loss) gain on disposal of discontinued operations, net (in dollars per share)		$ (0.05)	$ 0.02	$ (0.08)
Net loss per common share (in dollars per share)	$ (0.92)	$ (0.24)	$ (1.07)	$ (0.40)
Average common shares outstanding:
Basic (in shares)	26,822	26,115	26,715	26,026
Diluted (in shares)	26,822	26,115	26,715	26,026