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Components of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
Jan. 31, 2016
Oct. 31, 2015
Apr. 30, 2015
Jan. 31, 2015
Oct. 31, 2014
Apr. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Foreign currency translation adjustments $ (49,349)   $ (20,919)      
Deferred compensation and pension plan adjustments, net of tax (18,366)   (19,708)      
Unrealized gains on marketable securities, net of tax     4      
Accumulated other comprehensive loss, net $ (67,715) $ (56,715) $ (40,623) $ (43,747) $ (17,671) $ (2,388)