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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Jul. 02, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Business Acquisition [Line Items]
Restructuring charges		$ 13,000
Actix [Member]
Business Acquisition [Line Items]
Business acquisition				$ 112,405
Celcite [Member]
Business Acquisition [Line Items]
Business acquisition			$ 142,077
Comverse [Member]
Business Acquisition [Line Items]
Business acquisition	$ 268,073
Restructuring charges	$ 13,000

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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