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Intangible Assets, Goodwill and Long-Lived Assets - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Jul. 31, 2013
Apr. 30, 2013
Jul. 31, 2012
Apr. 30, 2012
Jul. 31, 2011
Apr. 30, 2011
Jul. 31, 2013
Continuing Operations
Jul. 31, 2013
Continuing Operations
Jul. 31, 2012
Continuing Operations
Jul. 31, 2011
Continuing Operations
Oct. 31, 2011
Trademarks
Goodwill And Other Intangible Assets [Line Items]                      
Aggregate amortization expense for amortizable intangibles $ 11,037   $ 11,135   $ 10,262     $ 10,460 $ 10,651 $ 9,595  
Indefinite-lived intangible assets impairment                     2,036
Goodwill, impairment loss   0   0   0          
Non-cash impairment charge $ 13,525       $ 3,466   $ 2,000 $ 2,000   $ 2,036