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Enterprise-wide Disclosures and Concentration of Business - Additional Information (Detail) - Net Operating Revenue | 12 Months Ended
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Sep. 30, 2017 country | Sep. 30, 2016 country customer | Sep. 30, 2015 country customer
Geographic Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Number of countries, outside the United States, that exceeded 10% | 0 | 0 | 0
Customer Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Number of customers that exceeded 10% | 0 | 0 | 0
United States | Geographic Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Concentration Risk, Percentage | 47.00% | 52.00% | 53.00%

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