Product Warranties (Tables)

9 Months Ended

Apr. 30, 2018

Guarantees and Product Warranties [Abstract]

Schedule of Changes in Product Warranty Liabilities

Changes in our product warranty liabilities are as follows:

	Three Months Ended April 30,						Nine Months Ended April 30,
	2018			2017			2018			2017
Beginning balance	$	243,310		$	209,173		$	216,781		$	201,840
Provision		71,037			50,358			198,079			146,454
Payments		(54,218	)		(44,613	)		(154,731	)		(133,376	)
Ending balance	$	260,129		$	214,918		$	260,129		$	214,918