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Goodwill - Summary of Most Sensitive Key Assumptions Used for CGUs (Detail) | Oct. 01, 2017 | Oct. 01, 2016
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Bottom of range [member] |  |
Disclosure of information for cash-generating units [line items] |  |
After tax discount rate | 8.90% | 9.00%
Top of range [member] |  |
Disclosure of information for cash-generating units [line items] |  |
After tax discount rate | 15.10% | 13.70%
Terminal growth rate | 3.00% |
Consulting Services Global [member] |  |
Disclosure of information for cash-generating units [line items] |  |
After tax discount rate | 11.30% |
Terminal growth rate | 3.00% |
Consulting Services Global [member] | Bottom of range [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Operating margin rates | 5.60% |
Non-cash working capital rates | 14.90% |
Consulting Services Global [member] | Top of range [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Operating margin rates | 8.10% |
Non-cash working capital rates | 15.30% |
Construction Services [member] |  |
Disclosure of information for cash-generating units [line items] |  |
After tax discount rate | 12.50% |
Terminal growth rate | 3.00% |
Construction Services [member] | Bottom of range [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Operating margin rates | 1.10% |
Non-cash working capital rates | (5.10%) |
Construction Services [member] | Top of range [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Operating margin rates | 1.30% |
Non-cash working capital rates | (5.60%) |

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- Definition The growth rate used to extrapolate cash flow projections beyond the period covered by the most recent budgets/forecasts for a cash-generating unit (group of units). [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 134 -Subparagraph d -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_d_iv&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 134 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_e_iv&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Operating margin rate applied to cash flow projections. + References No definition available. + Details
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