Debt and Capital Lease Obligations - Senior Notes (Details)	Jul. 31, 2017 USD ($) exception	Jul. 01, 2014 USD ($)
Debt Instrument [Line Items]
Amount of notes issued	$ 1,114,650,000
Senior Notes [Member] \| Senior Unsecured Notes Due July 2022 [Member]
Debt Instrument [Line Items]
Amount of notes issued		$ 250,000,000
Interest rate on notes (in hundredths)		7.25%
Effective interest rate		7.80%
Number of exceptions for limitations \| exception	2
Restricted payment basket amount	$ 375,000,000.0
Restrictions on payment of dividends, amount free from restriction	$ 177,700,000
Trigger amount under indenture		$ 25,000,000
Senior Notes [Member] \| Senior Unsecured Notes Due July 2022 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Leverage Ratio	2.50
Senior Notes [Member] \| Senior Unsecured Notes Due July 2022 [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Leverage Ratio	1.0

Debt Covenant, Number of Exceptions for Limitations

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- Definition

Debt Instrument, Debt Default, Trigger Amount Under Indenture

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- Definition

Debt Instrument, Leverage Ratio

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- Definition

Debt Instrument, Restrictions on Payment of Dividends, Amount Free from Restriction

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- Definition

Debt Instrument, Restrictive Covenants, Payment Basket

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ 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 210.5-02.22(a)(1))
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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