The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

Name:	us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Company Overview - Additional Information (Detail) $ in Millions		9 Months Ended
	Jan. 02, 2017 USD ($)	Jun. 30, 2018 State Province
Company Overview [Line Items]
Date of incorporation		Aug. 22, 1997
Allied Acquisition [Member]
Company Overview [Line Items]
Acquisition purchase price in cash \| $	$ 2,625
United States
Company Overview [Line Items]
Number of states in which entity operates \| State		50
Canada
Company Overview [Line Items]
Number of provinces in which entity operates \| Province		6