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Share-Based Payments (Details 1) - Apr. 30, 2015 - $ / shares	Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at May 1, 2014, number of options	33,667
Outstanding at May 1, 2014, weighted average exercise price	$ 44.50
Granted, number of options	955,000
Granted, weighted average exercise price	$ 112.59
Exercised, number of options	31,667
Exercised, weighted average exercise price	$ 44.29
Outstanding at April 30, 2015, number of options	957,000
Outstanding at April 30, 2015, weighted average exercise price	$ 112.45
Exercisable at April 30, 2015, number of options	2,000
Exercisable at April 30, 2015, weighted average exercise price	$ 47.78

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Gross number of share options (or share units) granted during the period.

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