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Segment, Customers, and Geographic Information - Major Customers as Percentage of Net Revenue (Parenthetical) (Detail)
3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Maximum [Member]        
Revenue, Major Customer [Line Items]        
Concentration Risk, Percentage 10.00% 10.00% 10.00% 10.00%