Summary of Accounting Policies (Intangible Assets Disclosure) (Details) (USD $) In Thousands	Mar. 31, 2011	Mar. 31, 2010
Gross Carrying Amount	$ 423,327	$ 561,387
Accumulated amortization	(303,451)	(391,030)
Net Carrying Amount	119,876	170,357
Customer-Related Intangibles [Member]
Gross Carrying Amount	378,412	506,595
Accumulated amortization	(283,732)	(355,409)
Net Carrying Amount	94,680	151,186
Licenses and Other Intangibles [Member]
Gross Carrying Amount	44,915	54,792
Accumulated amortization	(19,719)	(35,621)
Net Carrying Amount	$ 25,196	$ 19,171

The accumulated amount of amortization 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)

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

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.

+ References

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)

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

The aggregate sum of gross carrying value of a major finite-lived intangible asset class, less accumulated amortization and any impairment charges. 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.

+ References

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)

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant