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CONSOLIDATED BALANCE SHEETS (Parenthetical) - SFr / shares
Mar. 31, 2020
Mar. 31, 2019
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 34,621,000
Treasury shares (in shares) 6,209,647 7,244,000