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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jun. 30, 2018
Deferred tax assets    
Non-capital loss carryforwards $ 161,119 $ 129,436
Capital loss carryforwards 155 417
Undeducted scientific research and development expenses 137,253 123,114
Depreciation and amortization 683,777 829,369
Restructuring costs and other reserves 17,845 17,202
Deferred revenue 53,254 62,726
Other 59,584 57,461
Total deferred tax asset 1,112,987 1,219,725
Valuation Allowance (77,328) (80,924)
Deferred tax liabilities    
Scientific research and development tax credits (14,482) (13,342)
Other (72,599) (82,668)
Deferred tax liabilities (87,081) (96,010)
Net deferred tax asset 948,578 1,042,791
Comprised of:    
Long-term assets 1,004,450 1,122,729
Long-term liabilities $ (55,872) $ (79,938)