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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Deferred tax assets    
Non-capital loss carryforwards $ 129,436 $ 109,060
Capital loss carryforwards 417 246
Undeducted scientific research and development expenses 123,114 101,998
Depreciation and amortization 829,369 887,735
Restructuring costs and other reserves 17,202 22,956
Deferred revenue 62,726 75,248
Other 57,461 74,668
Total deferred tax asset 1,219,725 1,271,911
Valuation Allowance (80,924) (58,925)
Deferred tax liabilities    
Scientific research and development tax credits (13,342) (12,070)
Acquired intangibles 0 0
Other (82,668) (79,928)
Deferred tax liabilities (96,010) (91,998)
Net deferred tax asset 1,042,791 1,120,988
Comprised of:    
Long-term assets 1,122,729 1,215,712
Long-term liabilities $ (79,938) $ (94,724)