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Revenue from contracts with customers - Assets and liabilities related to contracts with customers (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Revenue from contracts with customers    
Contract liabilities - deferred revenue at beginning of period £ (223,500) £ (217,597)
Recognized in revenue during the period 183,186 180,512
Cash received/amounts invoiced during the period (150,019) (186,415)
Contract liabilities - deferred revenue at end of period (190,333) (223,500)
Current contract assets and contract liabilities    
Revenue from contracts with customers    
Contract assets - accrued revenue at beginning of period 39,532 38,018
Recognized in revenue during the period 44,383 39,532
Cash received/amounts invoiced during the period (37,949) (38,018)
Contract assets - accrued revenue at end of period 45,966 39,532
Contract liabilities - deferred revenue at beginning of period (190,146) (180,512)
Recognized in revenue during the period 183,186 180,512
Cash received/amounts invoiced during the period (150,019) (180,494)
Reclassified to current during the period (14,595) (9,652)
Contract liabilities - deferred revenue at end of period (171,574) (190,146)
Non-current contract assets and contract liabilities    
Revenue from contracts with customers    
Contract liabilities - deferred revenue at beginning of period (33,354) (37,085)
Cash received/amounts invoiced during the period   (5,921)
Reclassified to current during the period 14,595 9,652
Contract liabilities - deferred revenue at end of period £ (18,759) £ (33,354)