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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
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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) |  |  |

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