Goodwill - Additional Information (Detail)
|12 Months Ended|
Sep. 30, 2017
|Goodwill and Intangible Assets Disclosure [Abstract]|
|Number of reportable segments||2|
Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.
No definition available.