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Derivatives and Hedging (Details) (Interest Rate Swap, USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
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Jan. 31, 2015 Derivative | Jan. 31, 2014 | Jan. 31, 2015 Derivative | Jan. 31, 2014 | Jul. 31, 2014
Derivative [Line Items] |  |  |  |  |
Derivative, type of instrument |  |  | Interest rate swap |  |
Number of interest rate derivatives held | 2 us-gaap_NumberOfInterestRateDerivativesHeld |  | 2 us-gaap_NumberOfInterestRateDerivativesHeld |  |
Reclassification adjustment out of other comprehensive income into interest expense | $ 0.4 us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet | $ 0.6 us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet | $ 0.9 us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet | $ 1.2 us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet |
Description of interest rate cash flow hedge accounting method |  |  | Hypothetical derivative method |  |
Other liabilities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative designated as cash flow hedge, Fair value | $ 1.1 us-gaap_InterestRateCashFlowHedgeDerivativeAtFairValueNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  | $ 1.1 us-gaap_InterestRateCashFlowHedgeDerivativeAtFairValueNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  | $ 1.7 us-gaap_InterestRateCashFlowHedgeDerivativeAtFairValueNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember

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- Definition General discussion of the accounting for interest rate derivatives designated as hedging instruments in cash flow hedges. Includes discussion of where derivatives and the gain (loss) on derivatives are reported in the financial statements. Also includes discussion of the assessment of hedge effectiveness and measurement of hedge ineffectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(1),(3),(7)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph n -Subparagraph 1, 3 -Article 4 + Details
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- Definition Description of the types of interest rate derivative instruments designated as hedging instruments in cash flow hedges. For example, swaps, caps, floors, and collars. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41620-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Fair value as of the balance sheet date of all interest rate derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Number of interest rate derivative instruments held by the entity at the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 + Details
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