Supplementary Balance Sheet Information (Components Of Accounts Payable And Accrued Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2014	Jul. 31, 2014	Oct. 31, 2013
Balance Sheet Related Disclosures [Abstract]
Trade payables	$ 94,035	$ 71,823	$ 100,125
Deferred revenue	198,133	110,566	166,705
Accrued salaries, wages and deferred compensation	18,379	29,833	16,857
Accrued benefits	20,046	21,351	18,135
Deposits	14,614	15,272	12,972
Accrued interest	8,595	5,429	13,447
Other accruals	36,468	34,944	41,310
Total accounts payable and accrued liabilities	$ 390,270	$ 289,218	$ 369,551

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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