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CONSOLIDATED BALANCE SHEETS (Parenthetical) - SFr / shares
Mar. 31, 2019
Mar. 31, 2018
Statement of Financial Position [Abstract]    
Shares, par value (in CHF per share) SFr 0.25 SFr 0.25
Issued shares (in shares) 173,106,620 173,107,000
Shares that may be issued out of conditional capital (in shares) 50,000,000 50,000,000
Shares that may be issued out of authorized capital (in shares) 34,621,000 0
Treasury shares (in shares) 7,243,733 8,527,000