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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, 2014
Jan. 31, 2014
Oct. 31, 2013
Jul. 31, 2013
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, 2014
Apr. 30, 2013
Apr. 30, 2012
Text Block [Abstract]                              
Revenues $ 118,927 $ 117,852 $ 132,296 $ 128,558 $ 108,694 $ 112,167 $ 116,836 $ 117,638 $ 106,375 $ 111,520 $ 125,989 $ 124,066 $ 497,633 $ 455,335 $ 467,950
Operating income (loss) (5,973) (1,298) 9,450 9,737 2,110 78 4,426 5,807 (37,679) 4,448 11,730 10,468 11,916 12,421 (11,033)
Loss from continuing operations before discontinued operations (15,633) (11,033) (530) (114) (9,817) (11,146) (20,857) (8,163) (48,991) (24,517) (693) (3,502) (27,310) (49,983) (77,703)
Net loss attributable to common stockholders $ (11,815) $ (10,750) $ (339) $ (191) $ (13,397) $ (11,407) $ (20,967) $ (8,371) $ (49,124) $ (24,635) $ (765) $ (3,062) $ (23,095) $ (54,142) $ (77,586)
Basic and diluted:                              
Loss from continuing operations before discontinued operations $ (0.39) $ (0.28) $ (0.01) $ 0.00 $ (0.25) $ (0.28) $ (0.68) $ (0.30)         $ (0.58) $ (1.46) $ (2.90)
Net loss attributable to common stockholders $ (0.30) $ (0.27) $ (0.01) $ 0.00 $ (0.34) $ (0.29) $ (0.68) $ (0.31)         $ (0.58) $ (1.59) $ (2.90)
Basic:                              
Loss from continuing operations before discontinued operations                 $ (1.82) $ (0.91) $ (0.03) $ (0.13)      
Net loss attributable to common stockholders                 $ (1.83) $ (0.92) $ (0.03) $ (0.12)