Property and Equipment

12 Months Ended

May 31, 2018

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and Equipment

Cintas' property and equipment is summarized as follows at May 31:

(In thousands)	2018		2017
Land	$	177,281	$	173,166
Buildings and improvements	644,322		624,615
Equipment	2,070,009		1,930,018
Leasehold improvements	34,891		32,679
Construction in progress	119,937		79,400
	3,046,440		2,839,878
Less: accumulated depreciation	1,663,710		1,516,377
	$	1,382,730	$	1,323,501

Interest expense is net of capitalized interest of $1.0 million, $2.1 million and $1.1 million for the fiscal years ended May 31, 2018, 2017 and 2016, respectively. Cintas capitalizes certain expenditures for software that are purchased or internally developed for use in business. Included in equipment at May 31, 2018 and 2017 were $253.8 million and $229.0 million, respectively, of internal use software. Depreciation of internal use software begins when the software is ready for service and continues on the straight-line method over the estimated useful life, generally 10 years. Accumulated depreciation related to internal use software included in accumulated depreciation were $88.8 million and $78.3 million at May 31, 2018 and 2017, respectively.