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Product Warranties (Tables)
 9 Months Ended
Apr. 30, 2017
Guarantees [Abstract]  
Schedule of Changes in Product Warranty Liabilities

Changes in our product warranty reserves are as follows:

 

     Three Months Ended
April 30,		      Nine Months Ended
April 30,		  
     2017      2016      2017      2016  

Beginning balance

    $ 209,173      $ 106,260      $ 201,840      $ 108,206  

Provision

      50,358        33,853        146,454        85,369  

Payments

      (44,613 )       (27,492 )       (133,376 )       (80,954 ) 
  

 

 

     

 

 

     

 

 

     

 

 

  

Ending balance

    $ 214,918      $ 112,621      $ 214,918      $ 112,621