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Income Taxes (Tables)
 12 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of Income before Income Tax, Domestic and Foreign
The following is a geographical breakdown of income before the provision for income taxes:
 
Year Ended June 30,
 
2018
 
2017
 
2016
Domestic income (loss)
$
238,405

 
$
110,562

 
$
(80,066
)
Foreign income
147,721

 
138,989

 
370,843

Income before income taxes
$
386,126

 
$
249,551

 
$
290,777
Schedule of Components of Income Tax Expense (Benefit)
The provision for (recovery of) income taxes consisted of the following:
 
Year Ended June 30,
 
2018
 
2017
 
2016
Current income taxes (recoveries):
 
 
 
 
 
Domestic
$
5,313

 
$
12,238

 
$
(3,119
)
Foreign
48,777

 
82,593

 
63,862

 
54,090

 
94,831

 
60,743

Deferred income taxes (recoveries):
 

 
 

 
 

Domestic
61,678

 
(851,683
)
 
(44,569
)
Foreign
28,058

 
(19,512
)
 
(9,892
)
 
89,736

 
(871,195
)
 
(54,461
)
Provision for (recovery of) income taxes
$
143,826

 
$
(776,364
)
 
$
6,282
Schedule of Effective Income Tax Rate Reconciliation
A reconciliation of the combined Canadian federal and provincial income tax rate with our effective income tax rate is as follows:
 
Year Ended June 30,
 
2018
 
2017
 
2016
Expected statutory rate
26.5
%
 
26.5
%
 
26.5
%
Expected provision for income taxes
$
102,323

 
$
66,131

 
$
77,056

Effect of foreign tax rate differences
2,352

 
8,647

 
(71,478
)
Change in valuation allowance
1,779

 
520

 
(34,999
)
Amortization of deferred charges
4,242

 
6,298

 
11,316

Effect of permanent differences
4,332

 
3,673

 
10,711

Effect of changes in unrecognized tax benefits
5,543

 
14,427

 
(264
)
Effect of withholding taxes
7,927

 
3,845

 
3,457

Difference in tax filings from provision
1,321

 
(7,836
)
 
8,959

Effect of U.S. tax reform
19,037

 
—

 
—

Other Items
(5,030
)
 
4,045

 
1,524

Impact of internal reorganization of subsidiaries
—

 
(876,114
)
 
—

 
$
143,826

 
$
(776,364
)
 
$
6,282
Schedule of Deferred Tax Assets and Liabilities
The primary components of the deferred tax assets and liabilities are as follows, for the periods indicated below:
 
June 30,
 
2018
 
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
—

 
—

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
)
 
$
1,042,791

 
$
1,120,988
Summary of Income Tax Contingencies
The aggregate changes in the balance of our gross unrecognized tax benefits (including interest and penalties) were as follows:
Unrecognized tax benefits as of July 1, 2016
$
174,485

Increases on account of current year positions
5,675

Increases on account of prior year positions
18,938

Decreases due to settlements with tax authorities
(16,332
)
Decreases due to lapses of statutes of limitations
(8,236
)
Unrecognized tax benefits as of June 30, 2017
$
174,530

Increases on account of current year positions
6,483

Increases on account of prior year positions
17,794

Decreases due to settlements with tax authorities
—

Decreases due to lapses of statutes of limitations
(20,995
)
Unrecognized tax benefits as of June 30, 2018
$
177,812
Interest and Penalties Related to Liabilities for Income Tax Expense
For the year ended June 30, 2018, 2017 and 2016, we recognized the following amounts as income tax-related interest expense and penalties:
 
Year Ended June 30,
 
2018
 
2017
 
2016
Interest expense
$
6,233

 
$
13,028

 
$
6,534

Penalties expense (recoveries)
(191
)
 
438

 
(2,761
)
Total
$
6,042

 
$
13,466

 
$
3,773
Interest Accrued and Penalties Accrued Related to Income Tax Expense
The following amounts have been accrued on account of income tax-related interest expense and penalties:
 
As of June 30, 2018
 
As of June 30, 2017
Interest expense accrued *
$
54,058

 
$
47,402

Penalties accrued *
$
2,438

 
$
2,160

* These balances have been included within "Long-term income taxes payable" within the Consolidated Balance Sheets.