Long-Term Obligations - Schedule of Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2013	Jul. 31, 2012
Debt Instrument [Line Items]
Long-term Debt	$ 262,414	$ 316,208
Long-term Debt, Current Maturities	(61,264)	(61,264)
Long-term obligations, less current maturities	201,150	254,944
Euro-denominated notes payable in 2017 at a fixed rate of 3.71% [Member]
Debt Instrument [Line Items]
Long-term Debt	39,900	36,912
Euro-denominated notes payable in 2020 at a fixed rate of 4.24% [Member]
Debt Instrument [Line Items]
Long-term Debt	59,850	55,368
USD-denominated notes payable through 2014 at a fixed rate of 5.14% [Member]
Debt Instrument [Line Items]
Long-term Debt	18,750	37,500
USD-denominated notes payable through 2016 at a fixed rate of 5.30% [Member]
Debt Instrument [Line Items]
Long-term Debt	78,428	104,571
USD-denominated notes payable through 2017 at a fixed rate of 5.33% [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 65,486	$ 81,857