Changes in Accumulated Other Comprehensive Income by Component, Net of Tax (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended							6 Months Ended					3 Months Ended	6 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Available for Sale Securities	Sep. 30, 2013 Available for Sale Securities	Sep. 30, 2014 Available for Sale Securities	Sep. 30, 2013 Available for Sale Securities	Sep. 30, 2014 Currency Translation Adjustments	Jun. 30, 2014 Currency Translation Adjustments	Mar. 31, 2014 Currency Translation Adjustments	Sep. 30, 2013 Currency Translation Adjustments	Jun. 30, 2013 Currency Translation Adjustments	Mar. 31, 2013 Currency Translation Adjustments	Sep. 30, 2014 Pension/Post-retirement Benefits	Jun. 30, 2014 Pension/Post-retirement Benefits	Sep. 30, 2013 Pension/Post-retirement Benefits	Jun. 30, 2013 Pension/Post-retirement Benefits	Mar. 31, 2013 Pension/Post-retirement Benefits	Sep. 30, 2014 Interest Rate Swaps	Sep. 30, 2013 Interest Rate Swaps	Sep. 30, 2014 Interest Rate Swaps	Sep. 30, 2013 Interest Rate Swaps
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, beginning balance	$ (11,877)	$ (16,913)	$ (12,225)	$ (17,141)	$ 193	$ (10)	$ 92	$ (121)	$ (9,811)	$ (9,811)	$ (9,811)	$ (9,811)	$ (9,811)	$ (9,811)	$ (116)	$ 15	$ (4,353)	$ (4,353)	$ (4,353)	$ (2,274)	$ (2,739)	$ (2,390)	$ (2,856)
Gains/(losses) recognized in OCI	(35)	(237)	128	(206)	(35)	(237)	(3)	(206)							131
Reclasses from OCI to net income	184	180	369	377	67	64	136	144												117	116	233	233
Net period OCI	149	(57)	497	171	32	(173)	133	(62)							131					117	116	233	233
Accumulated other comprehensive income, ending balance	$ (11,728)	$ (16,970)	$ (11,728)	$ (16,970)	$ 225	$ (183)	$ 225	$ (183)	$ (9,811)	$ (9,811)	$ (9,811)	$ (9,811)	$ (9,811)	$ (9,811)	$ 15	$ 15	$ (4,353)	$ (4,353)	$ (4,353)	$ (2,157)	$ (2,623)	$ (2,157)	$ (2,623)

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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