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Goodwill - Summary of Most Sensitive Key Assumptions Used for CGUs (Detail)	Oct. 01, 2017	Oct. 01, 2016
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%)

X

- Definition

The discount rate applied to cash flow projections for a cash-generating unit (group of units). [Refer: Cash-generating units [member]]

+ References

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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
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

Non-cash working capital rate applied to cash flow projections.

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- Definition

Operating margin rate applied to cash flow projections.

+ References

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