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Tax on Profit on Ordinary Activities - Tax on Items Charged to Equity and Comprehensive Income (Details) - GBP (£) £ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Income Taxes [Abstract]
Share-based compensation	£ (1,090)	£ (42)	£ (63)
Total credit to equity and statement of comprehensive income	£ (1,090)	£ (42)	£ (63)

X

- Definition

Income Tax Relating To Components Of Other Comprehensive Income And Items Credited (Charged) Directly To Equity

+ References

No definition available.

+ Details

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X

- Definition

Income Tax Relating to Share-Based Compensation Included In Other Comprehensive Income

+ References

No definition available.

+ Details

Name:	dava_IncomeTaxRelatingtoShareBasedCompensationIncludedInOtherComprehensiveIncome
Namespace Prefix:	dava_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Income Taxes [Abstract]

+ References

No definition available.

+ Details

Name:	dava_IncomeTaxesAbstract
Namespace Prefix:	dava_
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