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Severance Expense (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Severance Expense Textual [Abstract]
Severance expense		$ 6,226us-gaap_SeveranceCosts1		$ 8,126us-gaap_SeveranceCosts1
Accrued severance		5,100		5,100
Global compensation costs interest rate	7.00%
Selling, general and administrative expense	10,000us-gaap_EffectOnFutureEarningsAmount
Severance expense incurred by company		$ 6,200idt_SeveranceCosts1One

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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