Business Segments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Jan. 31, 2013 Segment	Jan. 31, 2012 Futurestep	Jan. 31, 2012 Futurestep	Jan. 31, 2012 Executive Recruitment	Jan. 31, 2012 Executive Recruitment
Segment Reporting Information [Line Items]
Increase in operating income		$ 0.6	$ 1.7	$ (0.6)	$ (1.7)
Number of business segments	3