Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450702-114947

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450691-114947

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 5

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947

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- Definition

Expiration date of the collective bargaining arrangement requiring contributions to the multiemployer plan, in CCYY-MM-DD format. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 5

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947

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- Definition

No authoritative reference available.

+ References

No definition available.

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- Definition

ndicate the multiemployer plan's certified zone status as currently required by the Pension Protection Act of 2006 or a subsequent amendment thereof. The zone status categories are red (critical status), orange (seriously endangered), yellow (endangered), and green (none of the above). The acceptable values are "red", "orange", "yellow", "green", "other", and "NA". A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

No definition available.

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- Definition

Indicate the multiemployer plan's certified zone status as yes/no based on the pending or implementation status of pension or postretirement benefit plan

+ References

No definition available.

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- Definition

Multiemployer plans collective bargaining arrangement expiration period.

+ References

No definition available.

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RETIREMENT PLANS (Details) (USD $)	12 Months Ended
RETIREMENT PLANS (Details) (USD $)	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2010
Multiemployer Plans [Line Items]
Pension Certified Zone Status			Green	Green
Company's Contributions	$ 1,124,571	$ 2,230,795
Local 351 IBEW Pension Plan [Member]
Multiemployer Plans [Line Items]
Federal Identification Number	22-3417366
Pension Certified Zone Status			Green	Green
FIP/RP Status Pending or Implemented	Yes
Expiration of Collective Bargaining Arrangement	Eff. until terminated
Company's Contributions	376,056	736,870
Puget Sound Electrical Workers Pension Plan [Member]
Multiemployer Plans [Line Items]
Federal Identification Number	91-6180333 / 001
Pension Certified Zone Status			Green	Green
FIP/RP Status Pending or Implemented	No
Expiration of Collective Bargaining Arrangement	May 31, 2015
Company's Contributions	253,944	304,420
Board of Trustees of the IBEW Local 102 Pension Plan [Member]
Multiemployer Plans [Line Items]
Federal Identification Number	22-1615726
Pension Certified Zone Status			Green	Green
FIP/RP Status Pending or Implemented	Yes
Expiration of Collective Bargaining Arrangement	Eff. until terminated
Company's Contributions	33,112	175,683
Board of Trustees of the IBEW Local 269 Pension Fund [Member]
Multiemployer Plans [Line Items]
Federal Identification Number	23-7301491
Pension Certified Zone Status			Green	Green
FIP/RP Status Pending or Implemented	Yes
Expiration of Collective Bargaining Arrangement	Eff. until terminated
Company's Contributions	65,343	388,889
IBEW Local 76 Retirement Plan [Member]
Multiemployer Plans [Line Items]
Federal Identification Number	91-6243526 / 001
FIP/RP Status Pending or Implemented	Yes
Expiration of Collective Bargaining Arrangement	Aug. 31, 2015
Company's Contributions	111,711	51,346
International Brotherhood of Electrical Workers District No. 9 Pension Plan [Member]
Multiemployer Plans [Line Items]
Federal Identification Number	93-6074829
FIP/RP Status Pending or Implemented	No
Expiration of Collective Bargaining Arrangement	Nov. 30, 2014
Company's Contributions	223,139	225,673
IBEW Local 164 Pension Fund [Member]
Multiemployer Plans [Line Items]
Federal Identification Number	22-6031199
Pension Certified Zone Status			Yellow	Yellow
FIP/RP Status Pending or Implemented	Yes
Expiration of Collective Bargaining Arrangement	Eff. until terminated
Company's Contributions	17,149	102,882
Other plans [Member]
Multiemployer Plans [Line Items]
Company's Contributions	$ 44,118	$ 245,032