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Commitments and contingencies (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Performance bonds |  |  |
Performance bond commitments | $ 37.5 |  |
Operating Lease expense | 77.0 | $ 80.6 | $ 75.4
Operating sublease income | 2.2 |  |
Sublease income, payments to be received, 2019 | 1.7 |  |
Sublease income, payments to be received, 2020 | $ 1.7 |  |
Percentage of employees covered by collective bargaining agreements | 13.00% |  |
Loss contingency, maximum potential loss | $ 31.0 |  |

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- Definition The percentage of employees covered by collective bargaining agreements as of the balance sheet date when it serves as a benchmark in a concentration of risk calculation. + References No definition available. + Details
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- Definition Amount of lease payments to be received by lessor in next fiscal year following latest fiscal year for operating lease. Excludes interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77888428&loc=SL77919396-209981 + Details
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- Definition Amount of lease payments to be received by lessor in second fiscal year following latest fiscal year for operating lease. Excludes interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77888428&loc=SL77919396-209981 + Details
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