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Summary of Restructuring Liability by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2013
Apr. 30, 2013
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve $ 9,825 $ 11,548
Corporate
    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 258 449
Executive Recruitment
    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 2,813 3,180
Executive Recruitment | North America
    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 1,149 1,577
Executive Recruitment | EMEA
    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 1,614 1,534
Executive Recruitment | Asia Pacific
    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 50 69
LTC
    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 4,625 6,453
Futurestep
    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 2,129 1,466
Severance
    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 2,706 4,819
Severance | Corporate
    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 258 449
Severance | Executive Recruitment
    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 1,191 1,596
Severance | Executive Recruitment | North America
    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 594 918
Severance | Executive Recruitment | EMEA
    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 550 678
Severance | Executive Recruitment | Asia Pacific
    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 47  
Severance | LTC
    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 896 2,497
Severance | Futurestep
    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 361 277
Facilities
    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 7,119 6,729
Facilities | Executive Recruitment
    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 1,622 1,584
Facilities | Executive Recruitment | North America
    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 555 659
Facilities | Executive Recruitment | EMEA
    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 1,064 856
Facilities | Executive Recruitment | Asia Pacific
    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 3 69
Facilities | LTC
    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 3,729 3,956
Facilities | Futurestep
    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve $ 1,768 $ 1,189