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Changes in Restructuring Liability (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Oct. 31, 2012
Oct. 31, 2012
Restructuring Cost and Reserve [Line Items]    
Liability as of Beginning of period $ 2,231 $ 2,770
Charge to expense 16,503 16,503
Reductions/recoveries (1,008) [1] (1,008) [1]
Non-cash items 204 204
Reductions for cash payments, net of refund (1,514) (1,924)
Exchange rate fluctuations 85 (44)
Liability as of End of period 16,501 16,501
Severance
    
Restructuring Cost and Reserve [Line Items]    
Liability as of Beginning of period 37 38
Charge to expense 11,324 11,324
Reductions/recoveries (38) [1] (38) [1]
Non-cash items (100) (100)
Reductions for cash payments, net of refund (2,006) (2,006)
Exchange rate fluctuations 21 20
Liability as of End of period 9,238 9,238
Facilities
    
Restructuring Cost and Reserve [Line Items]    
Liability as of Beginning of period 2,194 2,732
Charge to expense 5,179 5,179
Reductions/recoveries (970) [1] (970) [1]
Non-cash items 304 304
Reductions for cash payments, net of refund 492 82
Exchange rate fluctuations 64 (64)
Liability as of End of period $ 7,263 $ 7,263
[1] During the three and six months ended October 31, 2012, the Company recovered $1.0 million from a legal settlement (related to premises) attributable to a previous restructuring action.