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Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Property and equipment
Property and equipment, gross	$ 1,221,000	$ 1,208,500
Accumulated depreciation and amortization	(576,000)	(509,200)
Property and equipment, net	644,992	699,322
Depreciation expense	171,700	191,300	$ 69,100
Proceeds from disposal of property and equipment	$ 54,622	44,906	$ 4,396
Minimum
Property and equipment
Useful Lives	3 years
Maximum
Property and equipment
Useful Lives	10 years
Building and land
Property and equipment
Property and equipment, gross	$ 57,900	105,700
Building and land | Minimum
Property and equipment
Useful Lives	10 years
Building and land | Maximum
Property and equipment
Useful Lives	45 years
Leasehold improvements
Property and equipment
Property and equipment, gross	$ 381,400	349,300
Leasehold improvements | Minimum
Property and equipment
Useful Lives	1 year
Leasehold improvements | Maximum
Property and equipment
Useful Lives	20 years
Computer systems and equipment
Property and equipment
Property and equipment, gross	$ 652,000	627,700
Computer systems and equipment | Minimum
Property and equipment
Useful Lives	3 years
Computer systems and equipment | Maximum
Property and equipment
Useful Lives	12 years
Furniture and Fixtures
Property and equipment
Property and equipment, gross	$ 129,700	$ 125,800
Furniture and Fixtures | Minimum
Property and equipment
Useful Lives	3 years
Furniture and Fixtures | Maximum
Property and equipment
Useful Lives	10 years

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.14)
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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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Reference 2: 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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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 13
-Subparagraph a
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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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