Product Warranties (Tables)

3 Months Ended

Oct. 31, 2017

Guarantees and Product Warranties [Abstract]

Schedule of Changes in Product Warranty Liabilities

Changes in our product warranty reserves are as follows:

	Three Months Ended October 31,
	2017			2016
Beginning balance	$	216,781		$	201,840
Provision		63,833			51,947
Payments		(48,615	)		(44,799	)
Ending balance	$	231,999		$	208,988