Customers with 10% (or greater) of Net Revenues - Additional Information (Detail) - Entities Owned by One Global Company [Member] - Revenue [Member]	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Customer One [Member]
Concentration Risk [Line Items]
Percentage of concentration	15.10%	30.60%	11.60%	14.60%
Customer Two [Member]
Concentration Risk [Line Items]
Percentage of concentration	12.80%		4.90%
Customer Three [Member]
Concentration Risk [Line Items]
Percentage of concentration	14.80%		5.70%
Maximum [Member] | Customer Two [Member]
Concentration Risk [Line Items]
Percentage of concentration		1.00%		1.00%
Maximum [Member] | Customer Three [Member]
Concentration Risk [Line Items]
Percentage of concentration		1.00%		1.00%