Segment Information (Revenues and Long-Lived Assets by Geographic Area) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Total Consolidated Revenue	$ 259,729	$ 271,487	$ 266,172	$ 254,613	$ 264,240	$ 258,703	$ 253,961	$ 236,939	$ 1,052,001	$ 1,013,843	$ 960,277
Total Consolidated Long-lived Assets	364,981				335,546				364,981	335,546	333,446
Domestic Operations [Member]
Segment Reporting Information [Line Items]
Total Consolidated Revenue									651,342	606,363	578,157
Total Consolidated Long-lived Assets	206,521				157,367				206,521	157,367	148,724
Barbados, Dominica, St. Kitts and St. Maarten [Member]
Segment Reporting Information [Line Items]
Total Consolidated Revenue									354,773	362,427	342,831
Total Consolidated Long-lived Assets	156,609				176,229				156,609	176,229	182,701
Other International Operations [Member]
Segment Reporting Information [Line Items]
Total Consolidated Revenue									45,886	45,053	39,289
Total Consolidated Long-lived Assets	1,851				1,950				1,851	1,950	2,021
International Operations [Member]
Segment Reporting Information [Line Items]
Total Consolidated Revenue									400,659	407,480	382,120
Total Consolidated Long-lived Assets	$ 158,460				$ 178,179				$ 158,460	$ 178,179	$ 184,722