Subsequent Events	9 Months Ended
Subsequent Events	Apr. 30, 2020
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Second Amendment to Credit Agreement On May 11, 2020, we entered into a Second Amendment (the “Second Amendment”) further amending the Fourth Amended and Restated Credit Agreement (as amended, the “Amended Credit Agreement”). The Second Amendment’s principal changes include (i) increasing the maximum consolidated leverage ratio covenant for the fiscal quarter ended April 30, 2020 to 5.25x, (ii) suspending such financial maintenance covenant until October 31, 2021, (iii) maintaining a minimum liquidity (as defined in the credit agreement) of at least $50,000 during the fiscal quarter ending July 31, 2020 and $75,000 during each of the following fiscal quarters ending with the fiscal quarter ending July 31, 2021, (iv) requiring us to maintain minimum consolidated EBITDA for each period of four fiscal quarters ending on the last day of the fiscal quarters ending July 31, 2020 through July 31, 2021 and (v) limiting our ability to pay dividends and repurchase shares of our common stock during the period the consolidated leverage ratio and consolidated interest coverage ratio are suspended. We will not be paying a dividend on August 1, 2020. Pursuant to the Amended Credit Agreement, subject to the satisfaction of certain conditions precedent, including the consent of the lenders, we may from time to time increase our borrowing capacity under the revolving credit facility by, or incur incremental term loans in, an aggregate amount not to exceed the sum of (i) the greater of (x) $300,000 or (y) an amount equal to two times our consolidated EBITDA, calculated on a pro forma basis, plus (ii) the aggregate principal amount of voluntary prepayments of the revolving loans and term loans, minus the aggregate principal amount of certain incremental secured indebtedness otherwise incurred. The interest rates have been amended so that loans under the Amended Credit Agreement, until the third business day following the date on which a compliance certificate is delivered for the fiscal quarter ending October 31, 2021, bear interest at 2.00% above the base rate for base rate borrowings, or at 3.00% above LIBOR for LIBOR-based borrowings, and also provides for fees on the unused portion of the revolving credit facility at a rate of 0.50%. Thereafter, borrowings bear interest at rates ranging from 0.00% to 1.75% above base rate for base rate borrowings, or at rates ranging from 1.00% to 2.75% above LIBOR for LIBOR-based borrowings, depending on our consolidated leverage ratio, which is the consolidated ratio of total funded debt (minus certain unrestricted cash) to consolidated EBITDA. The Amended Credit Agreement also provides for fees on the unused portion of the revolving credit facility at rates ranging from 0.20% to 0.50%, depending on our consolidated leverage ratio. Interest rates have also been amended to include a 1.00% floor on all borrowings. The Amended Credit Agreement contains affirmative and negative covenants reasonably customary for similar credit facilities and is secured by (i) substantially all assets of Cantel and its U.S.-based subsidiaries, (ii) a pledge by Cantel and its U.S.-based subsidiaries that guarantees the obligations under the Amended Credit Agreement of all of the outstanding shares of its U.S.-based subsidiaries and 65% of the outstanding shares of certain of Cantel’s foreign-based subsidiaries and (iii) a guaranty by Cantel’s domestic subsidiaries. As of April 30, 2020, we are in compliance with all financial covenants under the Amended Credit Agreement. Amendment of Interest Rate Swap On May 13, 2020, in connection with the Second Amendment, we amended our $500,000 interest rate swap to modify the LIBOR floor from 0.00% to 1.00%. The amended terms of the interest rate swap reflect the 1.00% LIBOR floor included in the Amended Credit Agreement which allows for continued hedge accounting treatment. Changes in the fair value of the amended interest rate swap contract will continue to be recognized in other comprehensive income. The fair value of the amended interest rate swap on May 13, 2020 was a liability of approximately $21,920. Convertible Senior Notes Offering On May 15, 2020, we issued $168,000 aggregate principal amount of 3.25% convertible senior notes due 2025 (the “Notes”) in a private placement, including pursuant to the grant to the initial purchasers of $140,000 aggregate principal amount of the Notes, an option to purchase up to an additional $28,000 aggregate principal amount of Notes. The private placement offering closed on May 15, 2020. The net proceeds from this offering were approximately $162,977 (including net proceeds relating to the issuance of the additional Notes), after deducting the initial purchasers’ discount and before the cost of offering expenses. The initial conversion price will be approximately $41.51 per share of common stock and will be subject to adjustment if certain events occur. We intend to use the net proceeds from this offering for general corporate purposes, which includes applying at least 50% of the amount by which the net proceeds exceed $100,000 to the repayment of debt under our credit facilities as required by the Amended Credit Agreement. The Notes will also be redeemable, in whole or in part, for cash at our option at any time, and from time to time, on or after May 17, 2023 in certain circumstances at a redemption price equal to the principal amount of the Notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date. In addition, in certain limited circumstances, note holders may require us to repurchase their Notes for cash for a repurchase price equal to the principal amount of the Notes to be repurchased, plus accrued and unpaid interest, if any, to, but excluding, the applicable repurchase date. The Notes indenture does not contain any financial or operating covenants or restrictions on the payments of dividends, the incurrence of indebtedness or the issuance or repurchase of securities by us or any of its subsidiaries. The Notes indenture contains customary terms and covenants and events of default.