Derivative Instruments (Outstanding Foreign Exchange Forward Contracts) (Details) - Cash Flow Hedging - Forward Contracts $ in Thousands	Apr. 30, 2016 USD ($)
Inter-company Inventory and Accounts Receivables | Euro Member Countries, Euro
Derivative [Line Items]
Notional Amount	$ 112,748	[1]
Inter-company Inventory and Accounts Receivables | United Kingdom, Pounds
Derivative [Line Items]
Notional Amount	20,885	[1]
Inter-company Inventory and Accounts Receivables | Canada, Dollars
Derivative [Line Items]
Notional Amount	17,848	[1]
Inter-company Inventory and Accounts Receivables | Japan, Yen
Derivative [Line Items]
Notional Amount	7,012	[1]
Assets and Liabilities | Euro Member Countries, Euro
Derivative [Line Items]
Notional Amount	11,326	[2]
Assets and Liabilities | Switzerland, Francs
Derivative [Line Items]
Notional Amount	$ 4,114	[2]

[1] Amounts are reported in U.S. Dollars equivalent as of April 30, 2016.

[2] Amounts are reported in U.S. Dollars equivalent as of April 30, 2016.