June 30,
	2019	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)
	$948,578	$1,042,791