CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
Apr. 30, 2015	Apr. 30, 2014
Cash flows from operating activities
Net income	$ 34,680,000us-gaap_NetIncomeLoss	$ 32,560,000us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	7,573,000us-gaap_Depreciation	6,072,000us-gaap_Depreciation
Amortization	9,648,000us-gaap_AmortizationOfIntangibleAssets	7,882,000us-gaap_AmortizationOfIntangibleAssets
Stock-based compensation expense	4,354,000us-gaap_ShareBasedCompensation	3,978,000us-gaap_ShareBasedCompensation
Amortization of debt issuance costs	301,000us-gaap_AmortizationOfFinancingCosts	340,000us-gaap_AmortizationOfFinancingCosts
Loss on disposal of fixed assets	209,000	302,000
Loss on sale of business	2,206,000us-gaap_GainLossOnSaleOfBusiness
Impairment of assets	1,287,000us-gaap_AssetImpairmentCharges
Fair value adjustments to acquisition related liabilities	(2,516,000)	276,000
Deferred income taxes	(124,000)	2,000
Excess tax benefits from stock-based compensation	(2,662,000)	(3,815,000)
Changes in assets and liabilities, net of effects of business acquisitions/divestiture:
Accounts receivable	(7,239,000)	(7,675,000)
Inventories	(7,307,000)us-gaap_IncreaseDecreaseInInventories	(2,080,000)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	(2,444,000)	(1,353,000)
Accounts payable and other current liabilities	(5,463,000)	768,000
Income taxes	871,000us-gaap_IncreaseDecreaseInIncomeTaxes	3,470,000us-gaap_IncreaseDecreaseInIncomeTaxes
Net cash provided by operating activities	33,374,000	40,727,000
Cash flows from investing activities
Capital expenditures	(8,329,000)	(7,886,000)
Proceeds from disposal of fixed assets	49,000	8,000
Proceeds from sale of business, net of cash retained and disposal costs	3,942,000
Net asset value adjustment for PuriCore Acquisition	337,000
Acquisition of IMS, net of cash acquired	(22,112,000)
Acquisition of Pure Water Solutions	(11,879,000)cmn_PaymentsToAcquireBusinessTwelve
Acquisition of DentaPure, net of cash acquired	(9,977,000)
Acquisition of Jet Prep, net of cash acquired		(5,332,000)
Acquisition of Sterilator, net of cash acquired		(2,829,000)
Other, net	336,000	(504,000)
Net cash used in investing activities	(47,633,000)	(16,543,000)
Cash flows from financing activities
Borrowings under revolving credit facility	47,000,000us-gaap_ProceedsFromLinesOfCredit
Repayments under term loan facility		(5,000,000)us-gaap_RepaymentsOfSeniorDebt
Repayments under revolving credit facility	(36,000,000)us-gaap_RepaymentsOfLinesOfCredit	(25,500,000)us-gaap_RepaymentsOfLinesOfCredit
Debt modification costs		(1,314,000)
Proceeds from exercises of stock options	393,000	410,000
Dividends paid	(2,076,000)us-gaap_PaymentsOfDividendsCommonStock	(1,858,000)us-gaap_PaymentsOfDividendsCommonStock
Excess tax benefits from stock-based compensation	2,662,000	3,815,000
Purchases of treasury stock	(3,536,000)	(4,194,000)
Net cash provided by (used in) financing activities	8,443,000	(33,641,000)
Effect of exchange rate changes on cash and cash equivalents	(600,000)	(145,000)
Decrease in cash and cash equivalents	(6,416,000)	(9,602,000)
Cash and cash equivalents at beginning of period	31,781,000	34,076,000
Cash and cash equivalents at end of period	$ 25,365,000	$ 24,474,000

The increase (decrease) in cash flows from operations resulting from changes in deferred taxes.

No definition available.

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Amount of expense (income) related to adjustment to fair value of acquisition related liabilities.

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The cash paid (received) associated with net asset value adjustment for the acquisition of a business.

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No definition available.

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Represents the cash outflow associated with an eleventh acquisition of a business, net of the cash acquired from the purchase.

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No definition available.

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Represents the cash outflow associated with a thirteenth acquisition of a business, net of the cash acquired from the purchase.

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No definition available.

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Represents the cash outflow associated with a twelfth acquisition of a business, net of the cash acquired from the purchase.

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Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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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.

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The effect of exchange rate changes on cash balances in continuing operations held in foreign currencies.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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- Definition

Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment.

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No definition available.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.

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The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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The increase (decrease) during the reporting period in the amounts payable to taxing authorities for taxes that are based on the reporting entity's earnings, net of amounts receivable from taxing authorities for refunds of overpayments or recoveries of income taxes, and in deferred and other tax liabilities and assets.

+ References

No definition available.

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The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

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The increase (decrease) during the reporting period in the value of prepaid expenses and other assets not separately disclosed in the statement of cash flows, for example, deferred expenses, intangible assets, or income taxes.

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The increase (decrease) in cash associated with the entity's continuing operating, investing, and financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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No definition available.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash outflow to reacquire common stock during the period.

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The cash outflow for cost incurred in the modification of term of existing debt agreement in order for the entity to achieve some advantage.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow associated with a third acquisition of a business, net of the cash acquired from the purchase.

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No definition available.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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This element represents the cash inflow during the period from the sale of a component of the entity.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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-Subparagraph (b)

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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.

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

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-Number 210

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-Name Accounting Standards Codification

-Topic 230

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-Section 45

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The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

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-Publisher FASB

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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