Note J — Goodwill and Intangible Assets, Net of Accumulated Amortization

The change in goodwill for the years ended May 31, 2019 and May 31, 2018 are as follows:



Goodwill acquired in fiscal 2019 related to the December 2018 acquisition of Oasis. Goodwill acquired in fiscal 2018 related to the August 2017 acquisition of HROi and February 2018 acquisition of Lessor.  Refer to Note D of this Item 8 for further details.

The Company had certain intangible assets on its Consolidated Balance Sheets. The components of intangible assets, at cost, consisted of the following:







During fiscal 2019, the Company acquired intangible assets with weighted-average amortization periods as follows: customer lists —10.0 years; other intangible assets  — 3.0 years; and total —9.7 years.  Amortization expense relating to intangible assets was $55.8 million, $21.1 million, and $18.1 million for fiscal years 2019,  2018, and 2017, respectively.

The estimated amortization expense for the next five fiscal years relating to intangible asset balances is as follows: