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Fair Value Measurements Fair Value Measurements (Policies)
3 Months Ended
Oct. 31, 2017
Fair Value Disclosures [Abstract]  
Fair Value Measurement, Policy
Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The inputs used to measure fair value are prioritized into categories based on the lowest level of input that is significant to the fair value measurement. The categories in the fair value hierarchy are as follows:

Level 1: Quoted market prices in active markets for identical assets or liabilities.
Level 2: Observable market-based inputs for similar assets or liabilities or valuation models whose inputs are observable, directly or indirectly.
Level 3: Unobservable inputs.