Summary of the Preliminary Allocation of the Purchase Consideration for Equitrac and SVOX (Parenthetical) (Detail) (USD $)	9 Months Ended
	Jun. 30, 2011 Year
Business Acquisition [Line Items]
Accounts receivable, gross	$ 12,700,000
Accounts receivable, reserve	1,100,000
Equitrac Acquisitions
Business Acquisition [Line Items]
Business acquisition, acquired intangible assets	91,900,000	[1]
Equitrac Acquisitions | Customer Relationships
Business Acquisition [Line Items]
Business acquisition, acquired intangible assets	55,800,000
Weighted average life (Years)	15.0
Equitrac Acquisitions | Core and completed technology
Business Acquisition [Line Items]
Business acquisition, acquired intangible assets	22,000,000
Weighted average life (Years)	7.0
Equitrac Acquisitions | Trade Names
Business Acquisition [Line Items]
Business acquisition, acquired intangible assets	14,100,000
Weighted average life (Years)	10.0
SVOX Acquisitions
Business Acquisition [Line Items]
Business acquisition, acquired intangible assets	42,165,000	[1]
SVOX Acquisitions | Customer Relationships
Business Acquisition [Line Items]
Business acquisition, acquired intangible assets	35,612,000
Weighted average life (Years)	13.4
SVOX Acquisitions | Core and completed technology
Business Acquisition [Line Items]
Business acquisition, acquired intangible assets	6,268,000
Weighted average life (Years)	5.0
SVOX Acquisitions | Trade Names
Business Acquisition [Line Items]
Business acquisition, acquired intangible assets	$ 285,000
Weighted average life (Years)	3.0

[1] The following are the identifiable intangible assets acquired and their respective weighted average useful lives, as determined based on preliminary valuations (table in thousands, except for years):