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Stockholders' (Deficit) Equity - Accumulated Other Comprehensive Loss (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance $ (592) $ (1,952) $ 378
Other comprehensive income (loss) before reclassifications (24) (2,887) (1,752)
Amounts reclassified from accumulated other comprehensive income (loss) 655 4,247 (578)
Other comprehensive income (loss) 631 1,360 (2,330)
Ending balance 39 (592) (1,952)
Marketable Securities [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance 27 4 8
Other comprehensive income (loss) before reclassifications 12 23 (4)
Amounts reclassified from accumulated other comprehensive income (loss)         
Other comprehensive income (loss) 12 23 (4)
Ending balance 39 27 4
Commodity Hedges [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (619) 413 370
Other comprehensive income (loss) before reclassifications (36) (1,653) 621
Amounts reclassified from accumulated other comprehensive income (loss) 655 621 (578)
Other comprehensive income (loss) 619 (1,032) 43
Ending balance    (619) 413
Interest Rate Swaps [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance    (2,369)   
Other comprehensive income (loss) before reclassifications    (1,257) (2,369)
Amounts reclassified from accumulated other comprehensive income (loss)    3,626   
Other comprehensive income (loss)    2,369 (2,369)
Ending balance       $ (2,369)