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Segment and Related Information - Summary of Assets by Geographical Region (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Jun. 30, 2015
Segment Reporting Information [Line Items]    
Net equipment, leasehold improvements and property $ 58.3 $ 67.2
Total assets by geographical region 880.5 766.2
Reportable Geographical Components [Member]    
Segment Reporting Information [Line Items]    
Total assets by geographical region 641.6 580.8
United States    
Segment Reporting Information [Line Items]    
Net equipment, leasehold improvements and property 33.6 42.2
Total assets by geographical region 532.6 537.3
Rest of World    
Segment Reporting Information [Line Items]    
Net equipment, leasehold improvements and property 24.7 25.0
Total assets by geographical region $ 109.0 $ 43.5