Supplementary Balance Sheet Information (Components Of Accounts Payable And Accrued Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013
Balance Sheet Related Disclosures [Abstract]
Trade payables	$ 71,823	$ 61,364
Deferred revenue	110,566	93,759
Accrued salaries, wages and deferred compensation	29,833	27,946
Accrued benefits	21,351	19,787
Deposits	15,272	14,331
Accrued interest	5,429	8,018
Other accruals	34,944	44,314
Total accounts payable and accrued liabilities	$ 289,218	$ 269,519

Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of the obligations incurred through that date and payable for employees' services provided. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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