Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Fair Value Measurements - Asset Impairment (Details) - USD ($)	12 Months Ended	17 Months Ended
	Jul. 31, 2015	Jan. 31, 2015	Jul. 31, 2016
Asset impairment
Property and equipment	$ 62,541,000		$ 74,604,000
Impairment of assets	1,287,000
Assets Related to 2013 License Agreement
Asset impairment
Property and equipment	$ 287,000
2013 License Agreement
Asset impairment
Payments made for license		$ 1,000,000