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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Basic earnings per share        
Net income attributable to OpenText   $ 1,025,659 $ 284,477 $ 234,327
Basic earnings per share attributable to OpenText (in dollars per share)   $ 4.04 $ 1.17 $ 0.96
Diluted earnings per share        
Net income attributable to OpenText   $ 1,025,659 $ 284,477 $ 234,327
Diluted earnings per share attributable to OpenText (in dollars per share)   $ 4.01 $ 1.17 $ 0.95
Weighted-average number of shares outstanding        
Basic (in shares)   253,879 242,926 244,184
Effect of dilutive securities (in shares)   1,926 1,150 1,730
Diluted (in shares)   255,805 244,076 245,914
Excluded as anti-dilutive (in shares)   1,371 5,458 3,718
Income tax benefit from reorganization $ 876,100 $ 876,114 $ 0 $ 0