Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	6 Months Ended
	Dec. 31, 2017 USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 380,846
Ending Balance	384,785
SMP
Goodwill [Roll Forward]
Beginning Balance	116,003
Ending Balance	119,741
AMS
Goodwill [Roll Forward]
Beginning Balance	217,956
Ending Balance	218,157
MDS
Goodwill [Roll Forward]
Beginning Balance	46,887
Ending Balance	46,887
CES Creative Electronic Systems S.A.
Goodwill [Roll Forward]
Goodwill arising from the RTL acquisition	291
CES Creative Electronic Systems S.A. | SMP
Goodwill [Roll Forward]
Goodwill arising from the RTL acquisition	291
Delta
Goodwill [Roll Forward]
Goodwill arising from the RTL acquisition	201
Delta | AMS
Goodwill [Roll Forward]
Goodwill arising from the RTL acquisition	201
RTL
Goodwill [Roll Forward]
Goodwill arising from the RTL acquisition	3,447
RTL | SMP
Goodwill [Roll Forward]
Goodwill arising from the RTL acquisition	$ 3,447