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Share repurchase program (Details) (USD $)
3 Months Ended 6 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Authorization to repurchase common shares, percentage of shares of common stock outstanding at the end of the prior fiscal year 5.00%  
Share repurchased (in shares) 441,585 923,985
Average price per share repurchased, including commissions (in usd per share) $ 114.90 $ 108.23
Maximum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) 7,500,000 7,500,000