Disposition of Business (Details) - USD ($)		3 Months Ended								12 Months Ended
	Apr. 07, 2015	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Disposition of Business
Proceeds from sale of business, net of cash retained and disposal costs											$ 3,767,000
Reclassification adjustment to loss on sale of business for foreign currency translation gain included in net income during the period											1,264,000
Loss on sale of business											$ 2,206,000
Loss on sale of business, Diluted earnings per share (in dollars per share)		$ (0.39)	$ (0.34)	$ (0.37)	$ (0.34)	$ (0.32)	$ (0.30)	$ (0.27)	$ (0.27)	$ (1.44)	$ (1.15)	$ (1.04)
Specialty Packaging business | Other. | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Disposition of Business
Proceeds from sale of business, net of cash retained and disposal costs	$ 7,531,000
Amount held in escrow	660,000
Costs associated with disposition	1,128,000
Loss on sale of business											$ 2,206,000
Loss on sale of business, Diluted earnings per share (in dollars per share)											$ 0.04
Specialty Packaging business | Other. | Disposal Group, Held-for-sale, Not Discontinued Operations
Disposition of Business
Reclassification adjustment to loss on sale of business for foreign currency translation gain included in net income during the period	1,264,000
Current assets
Cash and cash equivalents	2,086,000
Accounts receivable, net of allowance for doubtful accounts	660,000
Inventories	789,000
Prepaid expenses and other current assets	181,000
Property and equipment, net	324,000
Intangible assets, net	728,000
Goodwill	5,740,000
Other assets	140,000
Total assets held -for-sale	10,648,000
Current Liabilities
Accounts payable	352,000
Compensation payable	70,000
Accrued expenses	74,000
Deferred revenue	18,000
Deferred income taxes	163,000
Other liabilities	75,000
Total liabilities held -for-sale	$ 752,000