Liability for Pension and Other Retirement Benefits (Tables)

12 Months Ended

Mar. 31, 2011

Liability for Pension and Other Retirement Benefits (Tables) [Abstract]

Balances of the benefit obligations and the fair value of plan assets

							Thousands of
	Millions of yen						U.S. dollars
	2011			2010			2011
Change in benefit obligation:
Benefit obligation, beginning of year	¥	137,452		¥	139,569		$	1,656,048
Service cost		6,630			7,224			79,880
Interest cost		3,585			3,745			43,193
Actuarial loss		1,854			4,048			22,337
Plan participants’ contributions		55			49			663
Acquisition		125			—			1,506
Plan amendment		—			208			—
Benefits paid		(13,505	)		(17,446	)		(162,711	)
Foreign currency exchange rate change		(1,836	)		55			(22,121	)
Benefit obligation, end of year	¥	134,360		¥	137,452		$	1,618,795
Change in plan assets:
Fair value of plan assets, beginning of year	¥	94,403		¥	88,252		$	1,137,386
Actual return on plan assets		251			10,329			3,024
Employer contributions		7,318			6,465			88,169
Plan participants’ contributions		55			49			663
Acquisition		55			—			663
Benefits paid		(8,381	)		(10,788	)		(100,976	)
Foreign currency exchange rate change		(1,410	)		96			(16,989	)
Fair value of plan assets, end of year	¥	92,291		¥	94,403		$	1,111,940
Funded status, end of year	¥	(42,069	)	¥	(43,049	)	$	(506,855	)
Prepaid benefit cost	¥	2,000		¥	22		$	24,096
Other current liability		(49	)		(89	)		(590	)
Accrued benefit liability		(44,020	)		(42,982	)		(530,361	)
	¥	(42,069	)	¥	(43,049	)	$	(506,855	)
Amounts recognized in accumulated other comprehensive income (loss):
Actuarial loss	¥	36,922		¥	34,979		$	444,843
Prior service cost		1,491			1,370			17,964
	¥	38,413		¥	36,349		$	462,807

Information for pension plans with accumulated benefit obligations

					Thousands of
	Millions of yen				U.S. dollars
	2011		2010		2011
Plans with accumulated benefit obligations in excess of plan assets:
Accumulated benefit obligations	¥	109,556	¥	119,363	$	1,319,952
Plan assets		73,171		82,806		881,578
Plans with projected benefit obligations in excess of plan assets:
Projected benefit obligations	¥	126,307	¥	134,348	$	1,521,771
Plan assets		82,238		91,255		990,819

Components of net periodic pension costs

	2011			2010			2009			2011
Service cost - Benefits earned during the year	¥	6,630		¥	7,224		¥	8,460		$	79,880
Interest cost on projected benefit obligation		3,585			3,745			3,885			43,193
Expected return on plan assets		(2,961	)		(2,452	)		(3,029	)		(35,675	)
Amortization of actuarial loss		2,285			2,478			1,622			27,530
Amortization of prior service cost		227			179			535			2,735
Curtailment and settlement loss (gain)		(12	)		(28	)		475			(145	)
Net periodic cost	¥	9,754		¥	11,146		¥	11,948		$	117,518

Other changes in plan assets and benefit obligations

							Thousands of
	Millions of yen						U.S. dollars
	2011			2010			2011
Current year actuarial loss (gain)	¥	4,216		¥	(3,829	)	$	50,795
Amortization of actuarial loss		(2,273	)		(2,450	)		(27,386	)
Current year prior service cost		348			208			4,193
Amortization of prior service cost		(227	)		(179	)		(2,735	)
	¥	2,064		¥	(6,250	)	$	24,867

Amortized estimated actuarial loss and prior service cost from accumulated other comprehensive income loss into net periodic cost over the next fiscal year

			Thousands of
	Millions of yen		U.S. dollars
Actuarial loss	¥	2,440	$	29,398
Prior service cost		189		2,277

Weighted-average assumptions for benefit obligations

	Domestic plans						Foreign plans
	2011			2010			2011			2010
Discount rate		2.0	%		2.0	%		6.0	%		6.0	%
Assumed rate of increase in future compensation levels (Point-based benefit system)		3.9	%		3.8	%		—			—
Assumed rate of increase in future compensation levels		2.6	%		2.6	%		4.6	%		4.4	%

Weighted-average assumptions for net periodic benefit cost

	Domestic plans									Foreign plans
	2011			2010			2009			2011			2010			2009
Discount rate		2.0	%		2.0	%		2.0	%		6.0	%		6.9	%		6.7	%
Assumed rate of increase in future compensation levels (Point-based benefit system)		3.8	%		3.9	%		3.9	%		—			—			—
Assumed rate of increase in future compensation levels		2.6	%		2.4	%		2.0	%		4.4	%		4.1	%		4.4	%
Expected long-term rate of return on plan assets		1.9	%		1.9	%		1.9	%		7.2	%		7.6	%		7.5	%

Fair values of benefit plan assets

	Millions of yen
At March 31, 2011	Level 1		Level 2		Level 3		Total
Plan assets
Cash	¥	4,822		—		—	¥	4,822
Equity securities
Japanese equities		7,569		386		—		7,955
Foreign equities		15,223		4,375		—		19,598
Pooled funds		4,252		571		—		4,823
Debt securities
Government bonds and municipal bonds		16,293		3,706		—		19,999
Corporate bonds		—		5,025		—		5,025
Other assets
Life insurance company general accounts		—		28,932		—		28,932
Other		38		653		446		1,137
Total	¥	48,197	¥	43,648	¥	446	¥	92,291

	Millions of yen
At March 31, 2010	Level 1		Level 2		Level 3		Total
Plan assets
Cash	¥	4,486		—		—	¥	4,486
Equity securities
Japanese equities		13,730		—		—		13,730
Foreign equities		17,358		—		—		17,358
Pooled funds		2,650		—		—		2,650
Debt securities
Government bonds and municipal bonds		20,030		1,245		—		21,275
Corporate bonds		—		4,698		—		4,698
Other assets
Life insurance company general accounts		—		29,638		—		29,638
Other		145		—		423		568
Total	¥	58,399	¥	35,581	¥	423	¥	94,403

	Thousands of U.S. dollars
At March 31, 2011	Level 1		Level 2		Level 3		Total
Plan assets
Cash	$	58,097		—		—	$	58,097
Equity securities
Japanese equities		91,193		4,651		—		95,844
Foreign equities		183,409		52,711		—		236,120
Pooled funds		51,229		6,879		—		58,108
Debt securities
Government bonds and municipal bonds		196,301		44,651		—		240,952
Corporate bonds		—		60,543		—		60,543
Other assets
Life insurance company general accounts		—		348,578		—		348,578
Other		458		7,867		5,373		13,698
Total	$	580,687	$	525,880	$	5,373	$	1,111,940

Estimated future employee service

Year ending March 31	Millions of yen
2012	¥	13,482
2013		11,477
2014		7,605
2015		8,495
2016		9,323
Through 2017-2021	¥	41,663

Accumulated postretirement benefit obligations and the fair value of the plan assets

							Thousands of
	Millions of yen						U.S. dollars
	2011			2010			2011
Change in accumulated postretirement benefit obligation:
Accumulated postretirement benefit obligation, beginning of year	¥	9,416		¥	9,069		$	113,446
Service cost		227			231			2,735
Interest cost		452			528			5,446
Actuarial loss (gain)		(134	)		979			(1,615	)
Curtailment		—			(456	)		—
Plan participants’ contributions		2			2			24
Medicare Part D		55			68			663
Benefits paid		(728	)		(659	)		(8,771	)
Foreign currency exchange rate change		(981	)		(346	)		(11,820	)
Accumulated postretirement benefit obligation, end of year	¥	8,309		¥	9,416		$	100,108
Change in plan assets:
Fair value of plan assets, beginning of year	¥	6,152		¥	6,579		$	74,120
Actual return on plan assets		424			1,156			5,108
Employer contributions		726			657			8,747
Plan participants’ contributions		2			2			24
Benefits paid		(1,303	)		(1,894	)		(15,698	)
Foreign currency exchange rate change		(650	)		(348	)		(7,831	)
Fair value of plan assets, end of year	¥	5,351		¥	6,152		$	64,470
Funded status, end of year	¥	(2,958	)	¥	(3,264	)	$	(35,638	)
Prepaid benefit cost	¥	719		¥	700		$	8,663
Other current liabilities		(38	)		(38	)		(458	)
Accrued benefit liability		(3,639	)		(3,926	)		(43,843	)
	¥	(2,958	)	¥	(3,264	)	$	(35,638	)
Amounts recognized in accumulated other comprehensive income (loss):
Actuarial loss	¥	3,050		¥	3,502		$	36,747
Prior service cost		551			616			6,639
	¥	3,601		¥	4,118		$	43,386

Net periodic postretirement benefit cost

										Thousands of
	Millions of yen									U.S. dollars
	2011			2010			2009			2011
Service cost - Benefits earned during the year	¥	227		¥	231		¥	311		$	2,735
Interest cost on projected benefit obligation		452			528			575			5,446
Expected return on plan assets		(302	)		(324	)		(400	)		(3,639	)
Amortization of actuarial loss		196			250			201			2,362
Amortization of prior service cost		65			70			128			783
Curtailment and settlement gain		—			(116	)		—			—
Net periodic cost	¥	638		¥	639		¥	815		$	7,687

Other changes in plan assets and accumulated postretirement benefit obligations

							Thousands of
	Millions of yen						U.S. dollars
	2011			2010			2011
Current year actuarial gain	¥	(256	)	¥	(309	)	$	(3,084	)
Amortization of actuarial loss		(196	)		(134	)		(2,362	)
Current year prior service cost		—			—			—
Amortization of prior service cost		(65	)		(70	)		(783	)
	¥	(517	)	¥	(513	)	$	(6,229	)

Amortized estimated actuarial loss and prior service cost for the postretirement benefit plans from accumulated other comprehensive income loss into net periodic cost over the next fiscal year

			Thousands of
	Millions of yen		U.S. dollars
Actuarial loss	¥	174	$	2,096
Prior service cost		65		783

Weighted-average assumptions used to determine accumulated postretirement benefit obligations

	2011			2010
Discount rate		5.6	%		5.4	%
Assumed rate of increase in future compensation levels		4.0	%		4.0	%
Current healthcare cost trend rate		7.9	%		7.8	%
Ultimate healthcare cost trend rate		4.8	%		4.8	%
Number of years to ultimate healthcare cost trend rate		5			7

Weighted average assumptions used to determine net periodic postretirement benefit cost

	2011			2010			2009
Discount rate		5.4	%		6.4	%		5.9	%
Assumed rate of increase in future compensation levels		4.0	%		4.0	%		4.0	%
Expected long-term rate of return on plan assets		5.6	%		5.5	%		5.5	%
Current healthcare cost trend rate		7.8	%		7.8	%		7.7	%
Ultimate healthcare cost trend rate		4.8	%		4.8	%		4.8	%
Number of years to ultimate healthcare cost trend rate		7			7			6

Fair values of postretirement benefit plan assets

	Millions of yen
At March 31, 2011	Level 1		Level 2		Level 3		Total
Plan assets
Cash	¥	283	¥	—	¥	—	¥	283
Equity securities
Foreign equities		650		—		—		650
Pooled funds		1,101		—		—		1,101
Debt securities
Government bonds and municipal bonds		—		2,276		—		2,276
Corporate bonds		—		1,041		—		1,041
Total	¥	2,034	¥	3,317	¥	—	¥	5,351

	Millions of yen
At March 31, 2010	Level 1		Level 2		Level 3		Total
Plan assets
Cash	¥	155	¥	—	¥	—	¥	155
Equity securities
Foreign equities		959		—		—		959
Pooled funds		1,113		—		—		1,113
Debt securities
Government bonds		—		2,936		—		2,936
Corporate bonds		—		989		—		989
Total	¥	2,227	¥	3,925	¥	—	¥	6,152

	Thousands of U.S. dollars
At March 31, 2011	Level 1		Level 2		Level 3		Total
Plan assets
Cash	$	3,410	$	—	$	—	$	3,410
Equity securities
Foreign equities		7,831		—		—		7,831
Pooled funds		13,265		—		—		13,265
Debt securities
Government bonds and municipal bonds		—		27,422		—		27,422
Corporate bonds		—		12,542		—		12,542
Total	$	24,506	$	39,964	$	—	$	64,470

Estimated future benefit payments

Year ending March 31	Millions of yen
2012	¥	679
2013		702
2014		724
2015		738
2016		759
Through 2017-2021	¥	4,132