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Discontinued operations (Tables)
6 Months Ended
Mar. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]  
Summary of Discontinued Operations
Three Months ended   Six Months ended
  March 31,   March 31,
  2013   2012   2013   2012
               
Revenue $ —         15       —         30  
Operating expenses   —         9       —         25  
Gain on sale before taxes   —         —         —         —    
Income before income taxes $ —         6       —         5  
Permanent tax benefit   —         —         —         —    
Provision for income taxes   —         (2 )     —         (2 )
Income from discontinued operations $ —         4       —         3