Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Acquisitions - Additional Information (Detail) - USD ($) $ in Millions	Aug. 12, 2016	Mar. 19, 2016	Jul. 31, 2015
CMC Group, Inc. [Member]
Business Acquisition [Line Items]
Total purchase consideration			$ 0.3
Major Business Systems, Inc [Member]
Business Acquisition [Line Items]
Total cash purchase consideration for assets acquired		$ 0.6
Atlas Tag Company of Canada Inc [Member]
Business Acquisition [Line Items]
Total cash purchase consideration for assets acquired	$ 0.3