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| Schedule of approximate percentage of net sales by primary category | The following table sets forth the approximate percentage of net sales by primary category: 
 
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| Summary of changes in deferred revenue | The following table provides a summary of the changes included in deferred revenue during fiscal 2021 and 2020: 
 
 
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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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- References No definition available. 
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