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Business Combinations - Summary of Preliminary Fair Values and Purchase Price Allocations in Aggregate of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |
Goodwill | $ 247,341 | $ 228,436
Acquired Business |  |
Business Acquisition [Line Items] |  |
Receivables | 8,008 |
Inventories | 3,059 |
Prepaid expenses and other current assets | 89 |
Property and equipment, net | 13,097 |
Intangibles | 25,952 |
Accrued expenses and other current liabilities | (365) |
Unearned service contract revenue | (2,763) |
Customer credit balances | (3,150) |
Other long-term liabilities | (25) |
Total net identifiable assets acquired | 43,902 |
Total consideration | 62,807 |
Less: Total net identifiable assets acquired | 43,902 |
Goodwill | $ 18,905 |

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