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Subsequent Event - Additional Information (Detail) - Subsequent Event [Member]
$ in Millions
Aug. 22, 2018
USD ($)
Minimum [Member]  
Subsequent Event [Line Items]  
Estimated cost of restructuring action for seond quarter of fiscal 2019 $ 8.0
Maximum [Member]  
Subsequent Event [Line Items]  
Estimated cost of restructuring action for seond quarter of fiscal 2019 $ 10.0