INCOME TAXES	6 Months Ended
Apr. 30, 2018
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	INCOME TAXES On December 22, 2017, the United States (U.S.) government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “Tax Act”). The Tax Act contains significant changes to existing tax law including, among other things, a reduction in the U.S. federal statutory tax rate from 35% to 21% and the implementation of a territorial tax system resulting in a one-time transition tax on the unremitted earnings of the Company’s foreign subsidiaries. The Tax Act also contains additional provisions that will become effective for HEICO in fiscal 2019 including a new tax on Global Intangible Low-Taxed Income (“GILTI”), a new deduction for Foreign-Derived Intangible Income (“FDII”), the repeal of the domestic production activity deduction and increased limitations on the deductibility of certain executive compensation. The Company has not yet determined the impact of the provisions of the Tax Act which do not become effective for HEICO until fiscal 2019. The Securities and Exchange Commission issued Staff Accounting Bulletin No. 118 (“SAB 118”), which provides guidance on the accounting for the tax effects of the Tax Act. This guidance provides companies with a measurement period not to exceed one year from the enactment of the Tax Act to complete their accounting for the related tax effects. SAB 118 further states that during the measurement period, companies who are able to make reasonable estimates of the tax effects of the Tax Act should include those amounts in their financial statements as provisional amounts and reflect any adjustments in subsequent periods as they refine their estimates or complete their accounting of such tax effects. As a result of the Tax Act, the Company has revised its estimated annual effective federal statutory income tax rate to reflect a reduction in the rate from 35% to 21% effective January 1, 2018, which results in a blended rate of 23.3% for HEICO in fiscal 2018. Additionally, the Company remeasured its U.S. federal net deferred tax liabilities and recorded a provisional discrete tax benefit of $16.6 million in the first quarter of fiscal 2018. Further, the Company recorded a provisional discrete tax expense of $4.7 million in the first quarter of fiscal 2018 related to a one-time transition tax on the unremitted earnings of the Company's foreign subsidiaries. The Company intends to pay this tax over the eight-year period allowed for in the Tax Act. The Company’s effective tax rate in the first six months of fiscal 2018 decreased to 14.8% from 29.5% in the first six months of fiscal 2017. The decrease principally reflects the previously mentioned discrete tax benefit from the remeasurement of the Company’s U.S. federal net deferred tax liabilities and the benefit of a lower federal statutory income tax rate, which were partially offset by the aforementioned one-time transition tax expense. The Company's effective tax rate in the second quarter of fiscal 2018 decreased to 23.6% from 32.0% in the second quarter of fiscal 2017. The decrease principally reflects the previously mentioned benefit of a lower federal statutory income tax rate.

INCOME TAXES

On December 22, 2017, the United States (U.S.) government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “Tax Act”). The Tax Act contains significant changes to existing tax law including, among other things, a reduction in the U.S. federal statutory tax rate from 35% to 21% and the implementation of a territorial tax system resulting in a one-time transition tax on the unremitted earnings of the Company’s foreign subsidiaries. The Tax Act also contains additional provisions that will become effective for HEICO in fiscal 2019 including a new tax on Global Intangible Low-Taxed Income (“GILTI”), a new deduction for Foreign-Derived Intangible Income (“FDII”), the repeal of the domestic production activity deduction and increased limitations on the deductibility of certain executive compensation. The Company has not yet determined the impact of the provisions of the Tax Act which do not become effective for HEICO until fiscal 2019.

The Securities and Exchange Commission issued Staff Accounting Bulletin No. 118 (“SAB 118”), which provides guidance on the accounting for the tax effects of the Tax Act. This guidance provides companies with a measurement period not to exceed one year from the enactment of the Tax Act to complete their accounting for the related tax effects. SAB 118 further states that during the measurement period, companies who are able to make reasonable estimates of the tax effects of the Tax Act should include those amounts in their financial statements as provisional amounts and reflect any adjustments in subsequent periods as they refine their estimates or complete their accounting of such tax effects.

As a result of the Tax Act, the Company has revised its estimated annual effective federal statutory income tax rate to reflect a reduction in the rate from 35% to 21% effective January 1, 2018, which results in a blended rate of 23.3% for HEICO in fiscal 2018. Additionally, the Company remeasured its U.S. federal net deferred tax liabilities and recorded a provisional discrete tax benefit of $16.6 million in the first quarter of fiscal 2018. Further, the Company recorded a provisional discrete tax expense of $4.7 million in the first quarter of fiscal 2018 related to a one-time transition tax on the unremitted earnings of the Company's foreign subsidiaries. The Company intends to pay this tax over the eight-year period allowed for in the Tax Act.

The Company’s effective tax rate in the first six months of fiscal 2018 decreased to 14.8% from 29.5% in the first six months of fiscal 2017. The decrease principally reflects the previously mentioned discrete tax benefit from the remeasurement of the Company’s U.S. federal net deferred tax liabilities and the benefit of a lower federal statutory income tax rate, which were partially offset by the aforementioned one-time transition tax expense.

The Company's effective tax rate in the second quarter of fiscal 2018 decreased to 23.6% from 32.0% in the second quarter of fiscal 2017. The decrease principally reflects the previously mentioned benefit of a lower federal statutory income tax rate.