Revenue from Contracts with Customers - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2018	Jun. 30, 2018
Disaggregation Of Revenue [Line Items]
Accounts receivable net of allowance for doubtful accounts	$ 229,134	$ 215,032
Standard product warranty description	The Company offers an assurance-type limited warranty that products will be free from defects in materials and workmanship. The warranty is typically one year or the industry standard in length and is limited to either (1) the replacement or repair of the product or (2) a credit against future purchases. The products are not sold with a right of return.
Assurance-type limited product warranty period	1 year
Minimum | Commercial | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Expected timing of satisfaction, period	30 days
Minimum | U.S. Government | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Expected timing of satisfaction, period	30 days
Maximum | Commercial | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Expected timing of satisfaction, period	60 days
Maximum | U.S. Government | Direct Ship Parts
Disaggregation Of Revenue [Line Items]
Expected timing of satisfaction, period	60 days
Maximum | U.S. Government | Services
Disaggregation Of Revenue [Line Items]
Expected timing of satisfaction, period	60 days