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Goodwill and Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended
	Mar. 31, 2018	Jan. 27, 2018	Jan. 26, 2019	Jul. 29, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill gross		$ 517,510	$ 521,516	$ 517,515
Accumulated impairment losses		(195,767)	$ (195,767)	$ (195,767)
Beginning balance		321,748
Purchase price allocation adjustments from fiscal 2017 acquisition	$ (91)	(5)
Goodwill, Acquired During Period	$ 4,097
Ending balance		$ 321,743

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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-Section 45
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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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