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Restructuring Charges, Net - Summary of Restructuring Liability by Segment (Detail) - USD ($)
$ in Thousands
Jan. 31, 2018
Oct. 31, 2017
Apr. 30, 2017
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve $ 5,141 $ 6,257 $ 13,695
Operating Segments | Executive Search      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve 267   870
Operating Segments | Executive Search | North America      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve 262   384
Operating Segments | Executive Search | EMEA      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve     393
Operating Segments | Executive Search | Asia Pacific      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve 5   6
Operating Segments | Executive Search | Latin America      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve     87
Operating Segments | Hay Group      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve 4,773   12,693
Operating Segments | Futurestep      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve 101   132
Severance      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve 1,433 1,541 5,341
Severance | Operating Segments | Executive Search      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve     527
Severance | Operating Segments | Executive Search | North America      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve     134
Severance | Operating Segments | Executive Search | EMEA      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve     393
Severance | Operating Segments | Hay Group      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve 1,433   4,814
Facilities      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve 3,708 $ 4,716 8,354
Facilities | Operating Segments | Executive Search      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve 267   343
Facilities | Operating Segments | Executive Search | North America      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve 262   250
Facilities | Operating Segments | Executive Search | Asia Pacific      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve 5   6
Facilities | Operating Segments | Executive Search | Latin America      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve     87
Facilities | Operating Segments | Hay Group      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve 3,340   7,879
Facilities | Operating Segments | Futurestep      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve $ 101   $ 132