FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Oct. 31, 2013	Oct. 31, 2012
Liabilities
Impairments related to goodwill and property and equipment	$ 0	$ 0
Recurring basis \| Level 1
Assets
Total assets	17,031	26,756
Recurring basis \| Level 1 \| U.S. Treasury securities
Assets
Investments	14,430	22,623
Recurring basis \| Level 1 \| Corporate equity securities
Assets
Investments	2,601	4,133
Recurring basis \| Level 2
Assets
Total assets	6,291	3,893
Recurring basis \| Level 2 \| Interest rate swaps
Liabilities
Derivative	2,516
Recurring basis \| Level 2 \| U.S. government agency securities
Assets
Investments	2,102	2,875
Recurring basis \| Level 2 \| Corporate bonds and notes
Assets
Investments	$ 4,189	$ 1,018

Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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