Document And Entity Information (USD $)	6 Months Ended
	Dec. 31, 2012	Feb. 11, 2013	Sep. 04, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	OSLER INC.
Document Type	10-Q
Current Fiscal Year End Date	--06-30
Entity Common Stock, Shares Outstanding		2,505,014
Entity Public Float			$ 136,483
Amendment Flag	false
Entity Central Index Key	0001403433
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Smaller Reporting Company
Entity Well-known Seasoned Issuer	No
Document Period End Date	Dec. 31, 2012
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2