Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012	Jul. 31, 2011
Liabilities
Fair value of long-term debt	$ 408,431	$ 416,694
Recurring [Member]
Assets
Total Assets	12,448	10,916
Liabilities
Total Liabilities	99,275	114,112
Recurring [Member] | Other Assets [Member]
Assets
Trading Securities	11,781	10,897
Recurring [Member] | Other Current Liabilities [Member] | Foreign Exchange Contract [Member]
Liabilities
Foreign exchange contracts	1	2
Recurring [Member] | Other Current Liabilities [Member] | Foreign exchange contracts - cash flow hedges [Member]
Liabilities
Foreign exchange contracts	132	830
Recurring [Member] | Other Current Liabilities [Member] | Foreign currency denominated debt - net investment hedge [Member]
Liabilities
Foreign exchange contracts		5,295
Recurring [Member] | Prepaid expenses and other current assets [Member] | Foreign Exchange Contract [Member]
Assets
Foreign exchange contracts	1	3
Recurring [Member] | Prepaid expenses and other current assets [Member] | Foreign exchange contracts - cash flow hedges [Member]
Assets
Foreign exchange contracts	665	16
Recurring [Member] | Prepaid expenses and other current assets [Member] | Foreign currency denominated debt - net investment hedge [Member]
Assets
Foreign exchange contracts	1
Recurring [Member] | Long Term Obligations Less Current Maturities [Member] | Foreign currency denominated debt - net investment hedge [Member]
Liabilities
Fair value of long-term debt	99,142	107,985
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets
Total Assets	11,781	10,897
Liabilities
Total Liabilities	0	0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Assets [Member]
Assets
Trading Securities	11,781	10,897
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Current Liabilities [Member] | Foreign Exchange Contract [Member]
Liabilities
Foreign exchange contracts	0	0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Current Liabilities [Member] | Foreign exchange contracts - cash flow hedges [Member]
Liabilities
Foreign exchange contracts	0	0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Current Liabilities [Member] | Foreign currency denominated debt - net investment hedge [Member]
Liabilities
Foreign exchange contracts		0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Prepaid expenses and other current assets [Member] | Foreign Exchange Contract [Member]
Assets
Foreign exchange contracts	0	0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Prepaid expenses and other current assets [Member] | Foreign exchange contracts - cash flow hedges [Member]
Assets
Foreign exchange contracts	0	0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Prepaid expenses and other current assets [Member] | Foreign currency denominated debt - net investment hedge [Member]
Assets
Foreign exchange contracts	0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long Term Obligations Less Current Maturities [Member] | Foreign currency denominated debt - net investment hedge [Member]
Liabilities
Fair value of long-term debt	0	0
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets
Total Assets	667	19
Liabilities
Total Liabilities	99,275	114,112
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Assets [Member]
Assets
Trading Securities	0	0
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Current Liabilities [Member] | Foreign Exchange Contract [Member]
Liabilities
Foreign exchange contracts	1	2
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Current Liabilities [Member] | Foreign exchange contracts - cash flow hedges [Member]
Liabilities
Foreign exchange contracts	132	830
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Current Liabilities [Member] | Foreign currency denominated debt - net investment hedge [Member]
Liabilities
Foreign exchange contracts		5,295
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Prepaid expenses and other current assets [Member] | Foreign Exchange Contract [Member]
Assets
Foreign exchange contracts	1	3
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Prepaid expenses and other current assets [Member] | Foreign exchange contracts - cash flow hedges [Member]
Assets
Foreign exchange contracts	665	16
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Prepaid expenses and other current assets [Member] | Foreign currency denominated debt - net investment hedge [Member]
Assets
Foreign exchange contracts	1
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long Term Obligations Less Current Maturities [Member] | Foreign currency denominated debt - net investment hedge [Member]
Liabilities
Fair value of long-term debt	99,142	107,985
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets
Total Assets	0	0
Liabilities
Total Liabilities	0	0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Assets [Member]
Assets
Trading Securities	0	0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Current Liabilities [Member] | Foreign Exchange Contract [Member]
Liabilities
Foreign exchange contracts	0	0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Current Liabilities [Member] | Foreign exchange contracts - cash flow hedges [Member]
Liabilities
Foreign exchange contracts	0	0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Current Liabilities [Member] | Foreign currency denominated debt - net investment hedge [Member]
Liabilities
Foreign exchange contracts		0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Prepaid expenses and other current assets [Member] | Foreign Exchange Contract [Member]
Assets
Foreign exchange contracts	0	0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Prepaid expenses and other current assets [Member] | Foreign exchange contracts - cash flow hedges [Member]
Assets
Foreign exchange contracts	0	0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Prepaid expenses and other current assets [Member] | Foreign currency denominated debt - net investment hedge [Member]
Assets
Foreign exchange contracts	0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long Term Obligations Less Current Maturities [Member] | Foreign currency denominated debt - net investment hedge [Member]
Liabilities
Fair value of long-term debt	$ 0	$ 0