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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - SFr / shares
Sep. 30, 2018
Mar. 31, 2018
Statement of Financial Position [Abstract]    
Shares, par value (in CHF per share) SFr 0.25 SFr 0.25
Shares, issued (in shares) 173,106,000 173,106,000
Shares that may be issued out of conditional capital (in shares) 50,000,000 50,000,000
Shares that may be issued out of the authorized capital (in shares) 34,621,324 0
Treasury, at cost, shares (in shares) 7,384,000 8,527,000