Product Warranties (Tables)

6 Months Ended

Jan. 31, 2018

Guarantees and Product Warranties [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,
	2018			2017			2018			2017
Beginning balance	$	231,999		$	208,988		$	216,781		$	201,840
Provision		63,209			44,149			127,042			96,096
Payments		(51,898	)		(43,964	)		(100,513	)		(88,763	)
Ending balance	$	243,310		$	209,173		$	243,310		$	209,173