Significant accounting policies, judgments and estimation uncertainty - Acquired and library content (Details) - Acquired and library content	12 Months Ended
	Jun. 30, 2019
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Disclosure Of Detailed Information About Acquired And Library Content [Line Items]
Useful lives or amortisation rates, intangible assets other than goodwill period	10.00%
Top of range
Disclosure Of Detailed Information About Acquired And Library Content [Line Items]
Useful lives or amortisation rates, intangible assets other than goodwill period	20.00%