INCOME TAXES - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020
Deferred tax assets
Non-capital loss carryforwards	$ 174,486	$ 208,248
Capital loss carryforwards	5,570	152
Undeducted scientific research and development expenses	197,791	160,354
Depreciation and amortization	391,974	415,516
Restructuring costs and other reserves	24,919	21,999
Deferred revenue	11,388	60,026
Other	73,236	76,031
Total deferred tax asset	879,364	942,326
Valuation allowance	(72,888)	(81,810)
Deferred tax liabilities
Scientific research and development tax credits	(15,080)	(14,361)
Other	(102,882)	(83,328)
Deferred tax liabilities	(117,962)	(97,689)
Net deferred tax asset	688,514	762,827
Comprised of:
Long-term assets	796,738	911,565
Long-term liabilities	$ (108,224)	$ (148,738)