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Supplemental Cash Flow Disclosures (Details) - USD ($)
$ in Thousands
9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash paid during the period for:    
Interest $ 21,091 $ 20,725
Income taxes 24,087 20,013
Change in accounts payable related to property, plant, and equipment $ 11,477 $ 15,404