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Consolidated Balance Sheets (Parenthetical) - £ / shares
Sep. 30, 2015
Sep. 30, 2014
Statement of Financial Position [Abstract]    
Preferred Shares, authorized 25,000,000 25,000,000
Preferred Shares, par value £ 0.01 £ 0.01
Preferred Shares, issued 0 0
Preferred Shares, outstanding 0 0
Ordinary Shares, authorized 700,000,000 700,000,000
Ordinary Shares, par value £ 0.01 £ 0.01
Ordinary Shares, issued 267,777,000 264,735,000
Ordinary Shares, outstanding 151,150,000 156,704,000
Treasury stock, at cost, ordinary shares 116,627,000 108,031,000