Employee Benefit Plans - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Jun. 30, 2015
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, employer contributions				$ 0	$ 0
Pension Plans, Defined Benefit | Scenario Forecast
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to the plan during the remaining quarters of fiscal 2017	$ 0	$ 0	$ 0
Supplemental Executive Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, employer contributions				100,000	$ 0
Supplemental Executive Retirement Plan | Scenario Forecast
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to the plan during the remaining quarters of fiscal 2017	$ 0	$ 0	$ 0
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Approximate increase in net periodic benefit				$ 800,000