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Employee Benefit Plans (Tables)
 12 Months Ended
Jun. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Employer Contributions
 
Fiscal Year Ended June 30,
 
2018
 
2017
 
2016
 
(in thousands)
Matching contributions
$
1,163

 
$
875

 
$
735

Discretionary contributions
4,700

 
3,413

 
3,617

Total contributions
$
5,863

 
$
4,288

 
$
4,352