CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Shares and Additional Paid in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income	Non-Controlling Interests
Balance (in shares) at Jun. 30, 2015		244,586,000	1,252,000
Balance at Jun. 30, 2015	$ 1,829,807	$ 934,427	$ (19,986)	$ 863,015	$ 51,828	$ 523
Issuance of Common Shares
Under employee stock option plans (in shares)		936,000
Under employee stock option plans	14,576	$ 14,576
Under employee stock purchase plans (in shares)		240,000
Under employee stock purchase plans	5,027	$ 5,027
Share-based compensation	25,978	25,978
Income tax effect related to share-based compensation	230	230
Purchase of treasury stock (in shares)			(450,000)
Purchase of treasury stock	$ (10,627)		$ (10,627)
Issuance of treasury stock (in shares)	434,156		434,000
Issuance of treasury stock	$ 0	$ (5,345)	$ 5,345
Commons Shares repurchased (in shares)		(2,952,000)
Common Shares repurchased	(65,509)	$ (9,825)		(55,684)
Dividends	(99,262)			(99,262)
Other comprehensive income (loss) - net	(5,518)				(5,518)
Non-controlling interest	0
Net income for the year	284,495			284,477		18
Balance (in shares) at Jun. 30, 2016		242,810,000	1,268,000
Balance at Jun. 30, 2016	$ 1,979,197	$ 965,068	$ (25,268)	992,546	46,310	541
Issuance of Common Shares
Under employee stock option plans (in shares)	1,012,644	1,012,000
Under employee stock option plans	$ 20,732	$ 20,732
Under employee stock purchase plans (in shares)		427,000
Under employee stock purchase plans	11,604	$ 11,604
Under the public Equity Offering (in shares)		19,811,000
Under the public Equity Offering	604,223	$ 604,223
Income tax effect related to public Equity Offering	5,077	5,077
Equity issuance costs	(19,574)	(19,574)
Share-based compensation	30,507	30,507
Income tax effect related to share-based compensation	1,534	1,534
Purchase of treasury stock (in shares)			(244,000)
Purchase of treasury stock	$ (8,198)		$ (8,198)
Issuance of treasury stock (in shares)	409,922		410,000
Issuance of treasury stock	$ 0	(5,946)	$ 5,946
Dividends	(120,581)			(120,581)
Other comprehensive income (loss) - net	2,490				2,490
Non-controlling interest	393	$ 229				164
Net income for the year	1,025,915			1,025,659		256
Balance (in shares) at Jun. 30, 2017		264,060,000	1,102,000
Balance at Jun. 30, 2017	$ 3,533,319	$ 1,613,454	$ (27,520)	1,897,624	48,800	961
Issuance of Common Shares
Under employee stock option plans (in shares)	2,869,569	2,870,000
Under employee stock option plans	$ 54,355	$ 54,355
Under employee stock purchase plans (in shares)		721,000
Under employee stock purchase plans	20,458	$ 20,458
Share-based compensation	$ 27,594	27,594
Issuance of treasury stock (in shares)	411,276		411,000
Issuance of treasury stock	$ 0	$ (8,788)	$ 8,788
Dividends	(145,613)			(145,613)
Other comprehensive income (loss) - net	(15,155)				(15,155)
Net income for the year	242,300			242,224		76
Balance (in shares) at Jun. 30, 2018		267,651,000	691,000
Balance at Jun. 30, 2018	$ 3,717,258	$ 1,707,073	$ (18,732)	$ 1,994,235	$ 33,645	$ 1,037