| Leases - Summary of Weighted-average Remaining Lease Term and Weighted-average Discount Rate (Detail) | Sep. 30, 2019 | 
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| Weighted-average remaining lease term: | |
| Operating leases | 8 years 8 months 12 days | 
| Finance leases | 2 years 10 months 24 days | 
| Weighted-average discount rate: | |
| Operating leases | 5.80% | 
| Finance leases | 5.40% | 
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- Definition Weighted average discount rate abstract. No definition available. 
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- Definition Weighted average lease term abstract. No definition available. 
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- Definition Weighted average discount rate for finance lease calculated at point in time. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Weighted average discount rate for operating lease calculated at point in time. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/exampleRef 
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