Impairment of Long-Lived Assets - Additional Information (Detail)	6 Months Ended
Mar. 31, 2020 USD ($)
Asset Impairment Charges [Abstract]
Impairment charges	$ 0

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Name:	us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration