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Quarterly Financial Information - Summary of Quarterly Financial Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Apr. 30, 2013
Jan. 31, 2013
Oct. 31, 2012
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2011
Oct. 31, 2010
Jul. 31, 2010
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Quarterly Financial Information [Line Items]                              
Revenues $ 108,694 $ 112,167 $ 116,836 $ 117,638 $ 106,375 $ 111,520 $ 125,989 $ 124,066 $ 106,772 $ 109,076 $ 119,694 $ 119,143 $ 455,335 $ 467,950 $ 454,685
Operating income (loss) 2,110 78 4,426 5,807 (37,679) 4,448 11,730 10,468 (2,324) 6,571 12,263 12,918 12,421 (11,033) 29,428
(Loss) income from continuing operations before discontinued operations (9,817) (11,146) (20,857) (8,163) (48,991) (24,517) (693) (3,502) 4,368 (6,003) 258 (1,587) (49,983) (77,703) (2,964)
Net (loss) income attributable to common stockholders $ (13,397) $ (11,407) $ (20,967) $ (8,371) $ (49,124) $ (24,635) $ (765) $ (3,062) $ 48,849 $ (6,365) $ (1,154) $ (2,902) $ (54,142) $ (77,586) $ 38,428
Basic and diluted:                              
(Loss) income from continuing operations before discontinued operations $ (0.25) $ (0.28) $ (0.68) $ (0.30)         $ 0.17 $ (0.23) $ 0.01 $ (0.06) $ (1.46) $ (2.90) $ (0.12)
Net (loss) income attributable to common stockholders $ (0.34) $ (0.29) $ (0.68) $ (0.31)         $ 1.85 $ (0.24) $ (0.04) $ (0.11) $ (1.59) $ (2.90) $ 1.47
Basic:                              
(Loss) income from continuing operations before discontinued operations         $ (1.82) $ (0.91) $ (0.03) $ (0.13)              
Net (loss) income attributable to common stockholders         $ (1.83) $ (0.92) $ (0.03) $ (0.12)              
Diluted:                              
(Loss) income from continuing operations before discontinued operations $ (0.25) $ (0.28) $ (0.68) $ (0.30) $ (1.82) $ (0.91) $ (0.03) $ (0.13) $ 0.17 $ (0.24) $ 0.01 $ (0.07)      
Net (loss) income attributable to common stockholders $ (0.34) $ (0.29) $ (0.68) $ (0.31) $ (1.83) $ (0.92) $ (0.03) $ (0.12) $ 1.85 $ (0.24) $ (0.04) $ (0.11)