Supplemental Statements of Cash Flows Information (Schedule of Supplemental Statement of Cash Flows Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Supplemental Statement of Cash Flows Information
Interest paid, net of amounts capitalized			$ 36,018	$ 24,966
Income taxes paid			56,210	31,443
Income tax refunds received			1,453	1,760
Non-cash activities:
Purchases of property, plant and equipment on account			4,423	8,438
Impact of the adoption of ASC 606 (Note 3)			38,700
Common shares issued from treasury to settle benefit obligations (Note 20)	$ 14,846	$ 14,741	$ 14,846	$ 14,741