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Credit Facility Transaction Costs Incurred

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Interest Coverage ratio

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Leverage Ratio

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Leverage Ratio Of Total Debt To Earnings Before Interest Tax Depreciation Amortization

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Percentage of Capital Stock Pledged as Collateral

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Revolving Credit Agreement Period

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Standard Product Warranty Time Period

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section 50

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-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b))

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-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

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-Subparagraph (SAB TOPIC 5.P.3)

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

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Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 13

-Section A

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-Name Accounting Standards Codification

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-Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response)

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

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Date the credit facility terminates, in CCYY-MM-DD format.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Number 210

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-Paragraph 19, 22

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Guarantees, Commitments and Contingencies - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended
	Oct. 11, 2011	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014	Jul. 31, 2014
Commitments and Contingencies Disclosure [Line Items]
Liabilities related to agreements		$ 0us-gaap_ContractualObligation		$ 0us-gaap_ContractualObligation
Revolving credit agreement period	5 years
Business exit cost		300,000us-gaap_BusinessExitCosts1	400,000us-gaap_BusinessExitCosts1	1,400,000us-gaap_BusinessExitCosts1	1,300,000us-gaap_BusinessExitCosts1
Product Extended Warranty Contracts
Commitments and Contingencies Disclosure [Line Items]
Deferred revenue for product extended warranty contracts		5,600,000		5,600,000		7,400,000
Revolving Credit Facility
Commitments and Contingencies Disclosure [Line Items]
Credit facility maximum borrow capacity	100,000,000
Credit facility, expiry date	Oct. 10, 2016
Percentage of capital stock pledge as collateral	65.00%
Leverage ratio		0.40%		0.40%
Credit facility transaction costs incurred		500,000		500,000
Credit facility, maturity period				5 years
Line of credit amount outstanding		0		0		0
Revolving Credit Facility \| Other Revolving Credit Facilities
Commitments and Contingencies Disclosure [Line Items]
Credit facility available borrowing capacity		1,200,000		1,200,000		4,400,000
Minimum
Commitments and Contingencies Disclosure [Line Items]
Standard product warranty term				12 months
Minimum \| Revolving Credit Facility
Commitments and Contingencies Disclosure [Line Items]
Credit facility commitment fee percentage	0.20%
Interest coverage ratio		300.00%		300.00%
Minimum \| Revolving Credit Facility \| LIBOR Rate
Commitments and Contingencies Disclosure [Line Items]
Variable interest rate	1.25%
Minimum \| Revolving Credit Facility \| Base Rate
Commitments and Contingencies Disclosure [Line Items]
Variable interest rate	0.00%
Maximum
Commitments and Contingencies Disclosure [Line Items]
Standard product warranty term				60 months
Maximum \| Revolving Credit Facility
Commitments and Contingencies Disclosure [Line Items]
Aggregate available credit amount under specified circumstances	150,000,000
Credit facility commitment fee percentage	0.35%
Leverage ratio of total debt to earnings before interest, taxes, depreciation, and amortization or EBITDA				275.00%
Maximum \| Revolving Credit Facility \| LIBOR Rate
Commitments and Contingencies Disclosure [Line Items]
Variable interest rate	2.00%
Maximum \| Revolving Credit Facility \| Base Rate
Commitments and Contingencies Disclosure [Line Items]
Variable interest rate	1.00%