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CONSOLIDATED BALANCE SHEETS (Parenthetical) - SFr / shares
Mar. 31, 2018
Mar. 31, 2017
Statement of Financial Position [Abstract]    
Shares, par value (in CHF per share) SFr 0.25 SFr 0.25
Issued shares (in shares) 173,106,620 173,106,620
Authorized shares (in shares) 173,106,620 173,106,620
Conditionally authorized shares (in shares) 50,000,000 50,000,000
Treasury shares (in shares) 8,526,642 10,727,000