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Product Warranties (Tables)
6 Months Ended
Jan. 31, 2019
Guarantees and Product Warranties [Abstract]  
Schedule of Changes in Product Warranty Liabilities
Changes in our product warranty liabilities during the indicated periods are as follows:
 
 
 
Three Months Ended
January 31,
 
 
Six Months Ended
January 31,
 
 
 
2019
 
 
2018
 
 
2019
 
 
2018
 
Beginning balance
 
$
271,749
 
 
$
231,999
 
 
$
264,928
 
 
$
216,781
 
Provision
 
 
45,080
 
 
 
63,209
 
 
 
114,847
 
 
 
127,042
 
Payments
 
 
(58,960
 
 
(51,898
 
 
(121,906
 
 
(100,513
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Ending balance
 
$
257,869
 
 
$
243,310
 
 
$
257,869
 
 
$
243,310