Summary of Significant Accounting Policies Catalog Costs and Related Amortization (Details) - USD ($) $ in Thousands	Jul. 31, 2019	Jul. 31, 2018
Accounting Policies [Abstract]
Deferred Advertising Costs	$ 5,617	$ 6,154

The costs of direct-response advertising whose primary purpose is to elicit sales to customers who could be shown to have responded specifically to the advertising and that results in probable future benefits and are reported as assets net of accumulated amortization.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant