Document And Entity Information
6 Months Ended
Dec. 31, 2011
Feb. 03, 2012
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Dec. 31, 2011  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2012  
Entity Registrant Name CONTANGO OIL & GAS CO  
Entity Central Index Key 0001071993  
Current Fiscal Year End Date --06-30  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   15,357,166