Amount billed to customers under long-term contracts or programs but not paid. Excludes amounts due that have been withheld because of retainage provisions in a contract.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 910

-SubTopic 310

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6471494&loc=d3e49354-109356

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3(c))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph c

-Article 5

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

Summary of Fair Values of Separately Identifiable Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended		0 Months Ended
	Jul. 31, 2014 Developed technologies	Mar. 02, 2013 Ultrasonix	Mar. 02, 2013 Ultrasonix Deferred Revenue	Mar. 02, 2013 Ultrasonix Developed technologies	Mar. 02, 2013 Ultrasonix Customer relationships	Mar. 02, 2013 Ultrasonix Tradenames	Mar. 02, 2013 Inventories Ultrasonix
Business Acquisition [Line Items]
Weighted average useful life	10 years			10 years	10 years 7 months 6 days	2 years
Gross amounts due under contracts		$ 8.7
Contract receivable expected uncollectible		2.2
Assets fair value adjustments			$ 0.8				$ 3.7
Amortization period			4 years 6 months