Acquisitions (Acquisition Of Vignette Corporation) (Details) (Vignette Corporation [Member], USD $)	0 Months Ended	12 Months Ended
	Jul. 21, 2009	Jun. 30, 2010	Jun. 30, 2009
Business Acquisition, Cost of Acquired Entity [Abstract]
Cash consideration paid per common share acquired (in dollars per share)	$ 8.00
Number of shares issued per common share acquired (in shares)	0.1447
Cash equivalent per share acquired (in dollars per share)	$ 5.33
Equity consideration paid	$ 125,223,000
Cash consideration paid	182,909,000
Fair value of total consideration transferred	308,132,000
Vignette shares already owned by OpenText through open market purchases (at fair value)	13,283,000
Total consideration transferred for Vignette	321,415,000
Acquisition related costs		1,931,000
Business Acquisition, Purchase Price Allocation [Abstract]
Current assets	171,616,000
Cash acquired from acquisition	92,309,000
Long-term assets	17,484,000
Total liabilities assumed	(68,541,000)
Total identifiable net assets	211,459,000
Goodwill	109,956,000
Fair value of accounts receivable acquired	27,100,000
Acquired accounts receivable, gross	28,300,000
Acquired accounts receivable, expected to be uncollectible	1,200,000
Recognized gain as a result of re-measuring the fair value the investment		4,400,000
Non-recurring charges		11,900,000
Business Acquisition, Pro Forma Information [Abstract]
Total revenues		918,230,000	936,237,000
Net income		71,871,000	41,509,000
Customer Assets [Member]
Business Acquisition, Purchase Price Allocation [Abstract]
Intangible assets	22,700,000
Technology Assets [Member]
Business Acquisition, Purchase Price Allocation [Abstract]
Intangible assets	$ 68,200,000