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Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Retirement Benefits [Abstract] |  |  |
Eligible employees contribution to 401(k) plan (up to 25%) | 25.00% |  |
Employer contributions into 401(k) plans | $ 8.4 | $ 7.3 | $ 7.1
Employee incentive plans expenses | $ 41.6 | $ 40.0 | $ 20.3

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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