Warranty

We provide service and warranty policies on our products. From time to time, we also voluntarily incur costs for certain warranty-type expenses occurring after the normal warranty period to help protect the reputation of our products and the goodwill of our customers. Warranty expense is affected by dealership labor rates, the cost of parts and the frequency of claims. Estimated costs related to product warranty are accrued at the time of sale and are based upon historical warranty and service claims experience. Adjustments are made to accruals as claim data and cost experience becomes available.

Changes in our product warranty liability are as follows:



	Three Months Ended
(In thousands)	November 25, 2017			November 26, 2016
Balance at beginning of period	$	30,805		$	12,412
Provision	9,953			3,898
Claims paid	(8,258		)	(4,663		)
Acquisition of Grand Design	—			12,904
Balance at end of period	$	32,500		$	24,551