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v3.10.0.1

Segment Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Customer A [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Concentration risk, percentage | 10.00% | 25.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer A [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Accounts receivable | $ 1.1 | $ 2.4
Concentration risk, percentage | 9.00% | 14.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer C [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Accounts receivable | $ 1.7 |
Concentration risk, percentage | 14.00% |

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