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Summary of Acquisition (Detail) - USD ($)
 12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Business Acquisition [Line Items]      
Receivables due from clients [1]     $ 116,509,000
Other current assets [1]     15,587,000
Property and equipment [1]     29,428,000
Intangible assets [1]     196,400,000
Other non-current assets [1]     7,345,000
Current liabilities [1]     125,640,000
Deferred compensation and other retirement plans [1]     31,400,000
Deferred tax liabilities [1]     58,729,000
Other liabilities [1]     8,536,000
Net assets acquired [1]     140,964,000
Purchase price $ 0   476,885,000 [1]
Goodwill [1]     335,921,000
Integration/acquisition costs $ 9,430,000 $ 22,379,000 45,409,000 [1]
Hay Group      
Business Acquisition [Line Items]      
Goodwill [1]     $ 335,921,000
[1] On December 1, 2015, the Company completed its acquisition of Legacy Hay, a global leader in people strategy and organizational performance, for $476.9 million, net of cash acquired. The purchase price consisted of $259.0 million in cash ($54 million from foreign locations), net of estimated cash acquired and 5,922,136 shares of the Company's common stock, par value $0.01 per share (the "Consideration Shares"), representing an aggregate value of $217.9 million based on the closing price of the Company's common stock on The New York Stock Exchange on November 30, 2015. On November 23, 2015, the Company borrowed $150 million from the Term Facility, to finance a portion of the Legacy Hay acquisition purchase price. As part of the acquisition, the Company has committed to a $40 million retention pool (of which $14.5 million and $9.0 million were paid in fiscal 2018 and 2017, respectively) for certain employees of Legacy Hay subject to certain circumstances. The remaining balance will be payable within 45 days after November 30, 2018.