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INCOME TAXES - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Jun. 30, 2019
Deferred tax assets    
Non-capital loss carryforwards $ 208,248 $ 161,119
Capital loss carryforwards 152 155
Undeducted scientific research and development expenses 160,354 137,253
Depreciation and amortization 415,516 683,777
Restructuring costs and other reserves 21,999 17,845
Deferred revenue 60,026 53,254
Other 76,031 59,584
Total deferred tax asset 942,326 1,112,987
Valuation Allowance (81,810) (77,328)
Deferred tax liabilities    
Scientific research and development tax credits (14,361) (14,482)
Other (83,328) (72,599)
Deferred tax liabilities (97,689) (87,081)
Net deferred tax asset 762,827 948,578
Comprised of:    
Long-term assets 911,565 1,004,450
Long-term liabilities $ (148,738) $ (55,872)