Annual report pursuant to Section 13 and 15(d)

Income taxes (Details 2)

v3.3.0.814
Income taxes (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Net operating loss carryforwards      
Income taxes paid $ 81,300 $ 79,400 $ 58,200
Unrecognized tax benefits      
Net unrecognized tax benefits 1,000 1,100  
Unrecognized tax benefits that, if recognized, would affect the annual effective income tax rate 1,000    
Interest and penalties included in net liability balance 500 500  
Reconciliation of the beginning and ending amount of gross unrecognized tax benefits      
Balance at beginning of year 812 812 1,059
Lapse of statute of limitations (200)   (230)
Reductions for tax positions of prior years (83)   (17)
Balance at end of year 529 812 812
United States.      
Net operating loss carryforwards      
Net operating loss carryforwards 2,100 4,500  
Deferred tax asset, foreign 700 2,400  
Valuation allowance established against the deferred tax asset 0    
Canada.      
Net operating loss carryforwards      
Net operating loss carryforwards 400 800  
Deferred tax asset, foreign 100 200  
Maximum      
Unrecognized tax benefits      
Interest expense recognized related to unrecognized tax benefits $ 100 $ 100 $ 100