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Retirement Benefits - Components of Net Periodic Benefit Cost (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Mar. 31, 2015
|
Mar. 31, 2014
|
Mar. 31, 2015
|
Mar. 31, 2014
|
|
| Compensation and Retirement Disclosure [Abstract] | ||||
| Service cost | $ 908 | $ 632 | $ 2,935 | $ 1,876 |
| Interest cost | 1,591 | 1,806 | 4,975 | 5,389 |
| Expected return on plan assets | (60) | (66) | (189) | (192) |
| Amortization of prior service cost | 243 | 251 | 730 | 751 |
| Amortization of net loss | 918 | 764 | 2,847 | 2,278 |
| Settlement/Curtailment | (845) | 0 | (454) | 0 |
| Net periodic benefit cost | $ 2,755 | $ 3,387 | $ 10,844 | $ 10,102 |