Product Warranties (Tables)

6 Months Ended

Jan. 31, 2017

Guarantees [Abstract]

Schedule of Changes in Product Warranty Liabilities

Changes in our product warranty reserves are as follows:

	Three Months Ended January 31,						Six Months Ended January 31,
	2017			2016			2017			2016
Beginning balance	$	208,988		$	107,847		$	201,840		$	108,206
Provision		44,149			25,283			96,096			51,516
Payments		(43,964	)		(26,870	)		(88,763	)		(53,462	)
Ending balance	$	209,173		$	106,260		$	209,173		$	106,260