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Segment Reporting - Additional Information (Detail)
 12 Months Ended
Jun. 30, 2018
Segment
Disclosure of reportable segments [Line Items]  
Number of reportable segment 4
Bottom of range [Member]  
Disclosure of reportable segments [Line Items]  
Period between provisional pricing and final invoicing 60 days
Top of range [Member]  
Disclosure of reportable segments [Line Items]  
Period between provisional pricing and final invoicing 120 days