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Discontinued operations (Tables)
9 Months Ended
Jun. 30, 2013
Discontinued Operations and Disposal Groups [Abstract]  
Summary of Discontinued Operations
Three Months ended   Nine Months ended
  June 30,   June 30,
  2013   2012   2013   2012
               
Revenue $ —         15       —         45  
Operating expenses   —         2       —         27  
Gain on sale before taxes   —         —         —         —    
Income before income taxes $ —         13       —         18  
Permanent tax benefit   —         —         —         —    
Provision for income taxes   —         (5 )     —         (7 )
Income from discontinued operations $ —         8       —         11