Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

May 31, 2018

Quarterly Financial Data [Abstract]

Summary of Results of Operations for Each Quarter

The following is a summary of the results of operation for each of the quarters within the fiscal years ended May 31, 2018 and 2017:

May 31, 2018 (in thousands)	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Revenue	$	1,611,503	$	1,606,441	$	1,589,138	$	1,669,550
Gross margin	$	739,353	$	716,369	$	700,463	$	752,338
Net income, continuing operations	$	161,108	$	137,737	$	295,789	$	189,298
Basic earnings per share, continuing operations	$	1.50	$	1.27	$	2.73	$	1.74
Diluted earnings per share, continuing operations	$	1.45	$	1.24	$	2.66	$	1.68
Weighted average number of shares outstanding	105,740		106,340		106,558		106,593

May 31, 2017 (in thousands)	First Quarter		Second Quarter		Third Quarter		Fourth Quarter
Revenue	$	1,266,650	$	1,271,077	$	1,255,367	$	1,530,287
Gross margin	$	576,427	$	565,218	$	559,924	$	678,726
Net income, continuing operations	$	136,208	$	121,950	$	116,954	$	82,174
Basic earnings per share, continuing operations	$	1.27	$	1.15	$	1.09	$	0.76
Diluted earnings per share, continuing operations	$	1.24	$	1.12	$	1.06	$	0.75
Weighted average number of shares outstanding	104,483		104,957		105,093		105,325