Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22580-107794

Name:	us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Nature of Operations and Accounting Policies - Additional Information (Detail) - Accounting Standards Update 2014-09 - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Apr. 30, 2019	Apr. 30, 2019	Aug. 01, 2018
Retained Earnings
Nature Of Operations And Significant Accounting Policies [Line Items]
Cumulative effect of the change in accounting principle, net of tax			$ (5,450)
Accrued Promotions and Rebates
Nature Of Operations And Significant Accounting Policies [Line Items]
Cumulative effect of the change in accounting principle, net of tax			7,127
Cumulative effect of change on equity or net assets on pre-tax basis	$ 317	$ 1,823
Deferred Income Tax Assets
Nature Of Operations And Significant Accounting Policies [Line Items]
Cumulative effect of the change in accounting principle, net of tax			$ 1,677