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Acquisitions (Narrative) (Detail) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) entity | Sep. 30, 2018 USD ($) entity | Sep. 30, 2019 USD ($) entity | Sep. 30, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |
Number of immaterial businesses acquired in period | entity | 13 | 15 |  |
Acquisition-related costs | $ 8,057,000 | $ 4,907,000 |  |
Goodwill expected to be deductible for tax purposes | 81,903,000 | 169,559,000 | $ 81,903,000 | $ 81,903,000
Trade receivables acquired in business combination gross contractual amount | 16,469,000 | 14,015,000 | 16,469,000 | 16,469,000
Trade receivables acquired in business combination expected to be uncollectible amount | $ 1,427,000 | 1,198,000 | $ 1,427,000 | $ 1,427,000
Fair value of acquired working capital is provisional |  |  | 10 | 10
One Acquisition [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Contingent consideration |  | $ 11,593,000 |  |
Contingent consideration payable period |  | 3 years |  |
One Acquisition [Member] | Maximum [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Contingent consideration |  | $ 12,582,000 |  |
Measurement Input, Discount Rate [Member] | One Acquisition [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination, contingent consideration, liability, measurement input |  | 2.7 |  |

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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the best estimate at the acquisition date of the contractual cash flows not expected to be collected, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
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