Intangible Assets and Goodwill (Schedule of Intangible Assets) (Details) (USD $) In Thousands	Jun. 30, 2011	Sep. 30, 2010
Gross carrying amount	$ 77,174	$ 56,900
Accumulated amortization	27,499	20,502
Net carrying amount	49,675	36,398
Trade Name and Trademarks [Member]
Gross carrying amount	2,823	681
Accumulated amortization	369	159
Net carrying amount	2,454	522
Technology [Member]
Gross carrying amount	21,907	11,754
Accumulated amortization	11,566	8,566
Net carrying amount	10,341	3,188
Customer Relationships [Member]
Gross carrying amount	52,444	44,465
Accumulated amortization	15,564	11,777
Net carrying amount	$ 36,880	$ 32,688

Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets having statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph a(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275

Name:	us-gaap_FiniteLivedIntangibleAssetsGross
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant